C Beginner Project: Build a Bank Management System

Last updated Dec 28, 2024

This C Beginner Project guides you through creating a basic Bank Management System. The concept is straightforward: simulate core banking functions within a console application.

Key Features:

Account Management: Open new accounts and manage existing ones.
Transaction Handling: Process both credit and debit transactions.
Account Operations: Remove accounts and view a list of current customers.
Realistic Simulation: Mimic real-world banking activities.

Technical Details:

Development Environment: Built using the GCC compiler.
User Interface: Console-based for interaction.
Source Code: Available for download after the image.

Login:

Default Password: "banklogin"

This C Bank Management System projects consist of below modules:

Login Module
Create new account
Update Exist account
Transactions Module
Check Existing account details
Delete Account
View Customer List

Login Module:

int main()
{
    char pass[20],password[20]="banklogin";
    int i=0;
    printf("\n\n\t\tEnter the password to login:");
    scanf("%s",pass);

    if (strcmp(pass,password)==0)
        {printf("\n\nPassword 
Match!\nLOADING");
        for(i=0;i<=6;i++)
        {
            fordelay(100000000);
            printf(".");
        }
                system("cls");
            menu();
        }
    else
        {   printf("\n\nWrong
 password!!\a\a\a");
            login_try:
            printf("\nEnter 1 to try
 again and 0 to exit:");
            scanf("%d",&main_exit);
            if (main_exit==1)
                    {

                        system("cls");
                        main();
                    }

            else if (main_exit==0)
                    {
                    system("cls");
                    close();}
            else
                    {printf("\nInvalid!");
                    fordelay(1000000000);
                    system("cls");
                    goto login_try;}

        }
        return 0;
}

Bank Management System in C: A Step-by-Step Guide

Menu Screen

After Login We will navigate to Menu Screen

The Menu screen code will be like below

void menu(void)
{   int choice;
    system("cls");
    system("color 8");
    printf("\n\n\t\t\tCUSTOMER ACCOUNT 
BANKING MANAGEMENT SYSTEM");
    printf("
\n\n\n\t\t\t\xB2\xB2\xB2\xB2\xB2\xB2\xB2 

WELCOME TO THE MAIN MENU 

\xB2\xB2\xB2\xB2\xB2\xB2\xB2");
    printf("\n\n\t\t1.Create 
new account\n\t\t
2.Update 
information of existing account\n\t\t
3.For transactions\n\t\t
4.Check the details of 
existing account\n\t\t
5.Removing existing account\n\t\t
6.View customer's list\n\t\t
7.Exit\n\n\n\n\n\t\t Enter your choice:");
    scanf("%d",&choice);

    system("cls");
    switch(choice)
    {
        case 1:new_acc();
        break;
        case 2:edit();
        break;
        case 3:transact();
        break;
        case 4:see();
        break;
        case 5:erase();
        break;
        case 6:view_list();
        break;
        case 7:close();
        break;

    }



}

Create new Account

void new_acc()

{
    int choice;
    FILE *ptr;

    ptr=fopen("record.dat","a+");
    account_no:
    system("cls");
    printf("\t\t\t\xB2\xB2\xB2\ ADD RECORD  \xB2\xB2\xB2\xB2");
    printf("\n\n\nEnter today's date(mm/dd/yyyy):");
    scanf("%d/%d/%d",&add.deposit.month,
&add.deposit.day,&add.deposit.year);
    printf("\nEnter the account number:");
    scanf("%d",&check.acc_no);
    while(fscanf(ptr,"%d %s 
%d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",&add.acc_no,
add.name,&add.dob.month,&add.dob.day,
&add.dob.year,&add.age,
add.address,add.citizenship
,&add.phone,
add.acc_type,&add.amt,
&add.deposit.month,
&add.deposit.day,&add.deposit.year)!=EOF)
    {
        if (check.acc_no==add.acc_no)
            {printf("Account no. already in use!");
            fordelay(1000000000);
                goto account_no;

            }
    }
    add.acc_no=check.acc_no;
        printf("\nEnter the name:");
    scanf("%s",add.name);
    printf("\nEnter the date of birth(mm/dd/yyyy):");
    scanf("%d/%d/%d",&add.dob.month,
&add.dob.day,&add.dob.year);
    printf("\nEnter the age:");
    scanf("%d",&add.age);
    printf("\nEnter the address:");
    scanf("%s",add.address);
    printf("\nEnter the citizenship number:");
    scanf("%s",add.citizenship);
    printf("\nEnter the phone number: ");
    scanf("%lf",&add.phone);
    printf("\nEnter the amount to deposit:$");
    scanf("%f",&add.amt);
    printf("\nType of account:
\n\t#Saving\n\t
#Current\n\t#Fixed1(for 1 year)
\n\t#Fixed2(for 2 years)
\n\t#Fixed3(for 3 years)
\n\n\tEnter your choice:");
    scanf("%s",add.acc_type);

        fprintf(ptr,"%d %s
 %d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,add.dob.day,
add.dob.year,add.age,
add.address,add.citizenship,
add.phone,add.acc_type,add.amt,
add.deposit.month,
add.deposit.day,add.deposit.year);


    fclose(ptr);
    printf("\nAccount created successfully!");
    add_invalid:
    printf("\n\n\n\t\tEnter 1 to 
go to the main menu and 0 to exit:");
    scanf("%d",&main_exit);
    system("cls");
    if (main_exit==1)
        menu();
    else if(main_exit==0)
            close();
    else
        {
            printf("\nInvalid!\a");
            goto add_invalid;
        }
}

Bank Management System with C Language

View Account Details:

void view_list()
{
    FILE *view;
    view=fopen("record.dat","r");
    int test=0;
    system("cls");
    printf("\nACC. NO.\tNAME\t\t\t
ADDRESS\t\t\tPHONE\n");

    while(fscanf(view,"%d %s %d/%d/%d 
%d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,&add.dob.month,
&add.dob.day,
&add.dob.year,&add.age,add.address,
add.citizenship,&add.phone,
add.acc_type,&add.amt,
&add.deposit.month,
&add.deposit.day,&add.deposit.year
)!=EOF)
       {
           printf("\n%6d\t %10s
\t\t\t%10s\t\t%.0lf",
add.acc_no,add.name,
add.address,add.phone);
           test++;
       }

    fclose(view);
    if (test==0)
        {   system("cls");
            printf("\nNO RECORDS!!\n");}

    view_list_invalid:
     printf("\n\nEnter 1 to go to 
the main menu and 0 to exit:");
        scanf("%d",&main_exit);
        system("cls");
        if (main_exit==1)
            menu();
        else if(main_exit==0)
            close();
        else
        {
            printf("\nInvalid!\a");
            goto view_list_invalid;
        }
}

Edit Account:

Now we will create a module to edit the account details of already existing account details in Bank Managementsystem Project

void edit(void)
{
    int choice,test=0;
    FILE *old,*newrec;
    old=fopen("record.dat","r");
    newrec=fopen("new.dat","w");

    printf("\nEnter the account no.
 of the customer whose info you want to change:");
    scanf("%d",&upd.acc_no);
    while(fscanf(old,"%d %s %d/%d/%d
 %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,&add.dob.month,
&add.dob.day,
&add.dob.year,&add.age,
add.address,
add.citizenship,&add.phone,
add.acc_type,&add.amt,
&add.deposit.month,
&add.deposit.day,&add.deposit.year)!=EOF)
    {
        if (add.acc_no==upd.acc_no)
        {   test=1;
            printf("\nWhich information
 do you want to change?\n1.Address
\n2.Phone\n\n
Enter your choice(1 for 
address and 2 for phone):");
            scanf("%d",&choice);
            system("cls");
            if(choice==1)
                {printf("Enter 
the new address:");
                scanf("%s",upd.address);
                fprintf(newrec,
"%d %s %d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,add.dob.month,
add.dob.day,add.dob.year,

add.age,upd.address,
add.citizenship,
add.phone,add.acc_type,
add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);
                system("cls");
                printf("Changes saved!");
                }
            else if(choice==2)
                {
                   
 printf("Enter the new phone number:");
                scanf("%lf",&upd.phone);
                fprintf(newrec,"%d 

%s %d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",add.acc_no,add.name,

add.dob.month,add.dob.day,

add.dob.year,
add.age,add.address,

add.citizenship,
upd.phone,add.acc_type,add.amt,

add.deposit.month,add.deposit.day,

add.deposit.year);
                system("cls");
                printf("Changes saved!");
                }

        }
        else
            fprintf(newrec,"%d %s 
%d/%d/%d %d %s %s %lf %s %f
 %d/%d/%d\n",add.acc_no,
add.name,add.dob.month,
add.dob.day,add.dob.year,
add.age,
add.address,add.citizenship,
add.phone,
add.acc_type,add.amt,
add.deposit.month,
add.deposit.day,add.deposit.year);
    }
    fclose(old);
    fclose(newrec);
    remove("record.dat");
    rename("new.dat","record.dat");

if(test!=1)
        {   system("cls");
            printf("\nRecord not found!!\a\a\a");
            edit_invalid:
              printf("\nEnter 0 
to try again,1 to return to main
 menu and 2 to exit:");
              scanf("%d",&main_exit);
              system("cls");
                 if (main_exit==1)

                    menu();
                else if (main_exit==2)
                    close();
                else if(main_exit==0)
                    edit();
                else
                    {printf("\nInvalid!\a");
                    goto edit_invalid;}
        }
    else
        {printf("\n\n\nEnter 1 to 
go to the main menu and 0 to exit:");
        scanf("%d",&main_exit);
        system("cls");
        if (main_exit==1)
            menu();
        else
            close();
        }
}

Amount Transaction Module

void transact(void)
{   int choice,test=0;
    FILE *old,*newrec;
    old=fopen("record.dat","r");
    newrec=fopen("new.dat","w");

        printf("Enter the account no. of the customer:");
    scanf("%d",&transaction.acc_no);
    while (fscanf(old,"%d %s 
%d/%d/%d %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,&add.dob.month,
&add.dob.day,

&add.dob.year,&add.age,
add.address,
add.citizenship,&add.phone,
add.acc_type,&add.amt,
&add.deposit.month,
&add.deposit.day,&add.deposit.year)!=EOF)
   {

            if(add.acc_no==transaction.acc_no)
            {   test=1;
                if(strcmpi(add.acc_type,"fixed1")==0||
strcmpi(add.acc_type,"fixed2")==0||
strcmpi(add.acc_type,"fixed3")==0)
                {
                    printf("
\a\a\a\n\nYOU CANNOT DEPOSIT OR 
WITHDRAW CASH IN FIXED 
ACCOUNTS!!!!!");
                    fordelay(1000000000);
                    system("cls");
                    menu();

                }
                printf("\n\nDo you want to\n1.Deposit\n2.Withdraw?\n\n
Enter your choice(1 for 
deposit and 2 for withdraw):");
                scanf("%d",&choice);
                if (choice==1)
                {
                    printf("
Enter the amount you want to deposit:$ ");
                    scanf("%f"
,&transaction.amt);
                    add.amt+=transaction.amt;
                    fprintf(
newrec,"%d %s %d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,
add.dob.day,add.dob.year,
add.age,add.address,add.citizenship,
add.phone,add.acc_type,add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);
                    printf("\n\nDeposited successfully!");
                }
                else
                {
                    
printf("Enter the amount you want
 to withdraw:$ ");
                    scanf("%f",
&transaction.amt);
                    add.amt-=transaction.amt;
                    fprintf(
newrec,"%d %s %d/%d/%d %d %s %s 
%lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,
add.dob.day,add.dob.year,
add.age,add.address,
add.citizenship,
add.phone,add.acc_type,add.amt,
add.deposit.month,add.deposit.day,
add.deposit.year);
                    
printf("\n\nWithdrawn successfully!");
                }

            }
            else
            {
               fprintf(newrec,"%d %s %d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,
add.dob.day,add.dob.year,
add.age,add.address,
add.citizenship,
add.phone,add.acc_type,add.amt,
add.deposit.month,add.deposit.day,
add.deposit.year);
            }
   }
   fclose(old);
   fclose(newrec);
   remove("record.dat");
   rename("new.dat",
"record.dat");
   if(test!=1)
   {
       printf("\n\nRecord not found!!");
       transact_invalid:
      printf("\n\n\nEnter
 0 to try again,1 to return to
 main menu and 2 to exit:");
      scanf("%d",&main_exit);
      system("cls");
      if (main_exit==0)
        transact();
    else if (main_exit==1)
        menu();
    else if (main_exit==2)
        close();
    else
    {
        printf("\nInvalid!");
        goto transact_invalid;
    }

   }
   else
   {
       printf("\nEnter 1 to go
 to the main menu and 0 to exit:");
        scanf("%d",&main_exit);
        system("cls");
        if (main_exit==1)
            menu();
        else
            close();
   }

}

Delete Account Module

void erase(void)
{
    FILE *old,*newrec;
    int test=0;
    old=fopen("record.dat","r");
    newrec=fopen("new.dat","w");
    printf("Enter the account no. of the customer you want to delete:");
    scanf("%d",&rem.acc_no);
    while (fscanf(old,"%d
 %s %d/%d/%d %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,
&add.dob.month,
&add.dob.day,
&add.dob.year,
&add.age,add.address,
add.citizenship,
&add.phone,add.acc_type,
&add.amt,
&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
   {
        if(add.acc_no!=rem.acc_no)
            fprintf(newrec,"%d %s %d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,add.dob.day,
add.dob.year,
add.age,add.address,
add.citizenship,
add.phone,add.acc_type,
add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);

        else
            {test++;
            printf("\nRecord deleted successfully!\n");
            }
   }
   fclose(old);
   fclose(newrec);
   remove("record.dat");
   rename("new.dat",
"record.dat");
   if(test==0)
        {
            printf("\nRecord not found!!\a\a\a");
            erase_invalid:
              printf("\nEnter 0 to try again,1 to return to main menu and 2 to exit:");
              scanf("%d",&main_exit);

                 if (main_exit==1)
                    menu();
                else if (main_exit==2)
                    close();
                else if(main_exit==0)
                    erase();
                else
                    {printf("\nInvalid!\a");
                    goto erase_invalid;}
        }
    else
        {printf("\nEnter 1 to go to the main menu and 0 to exit:");
        scanf("%d",&main_exit);
        system("cls");
        if (main_exit==1)
            menu();
        else
            close();
        }

}

View Account Details:

void see(void)
{
    FILE *ptr;
    int test=0,rate;
    int choice;
    float time;
    float intrst;
    ptr=fopen("record.dat","r");
    printf("Do you want to check by\n1.Account no\n2.Name\nEnter your choice:");
    scanf("%d",&choice);
    if (choice==1)
    {   printf("Enter
 the account number:");
        scanf("%d",&check.acc_no);

        while (fscanf(ptr,"%d %s %d/%d/%d
 %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,
&add.dob.month,
&add.dob.day,&add.dob.year,
&add.age,add.address,
add.citizenship,
&add.phone,add.acc_type,
&add.amt,
&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
        {
            if(add.acc_no==check.acc_no)
            {   system("cls");
                test=1;

                printf("\nAccount NO.:%d
\nName:%s \nDOB:%d/%d/%d 
\nAge:%d
 \nAddress:%s \nCitizenship No:%s \n
Phone number:%.0lf 
\nType Of Account:%s 
\nAmount deposited:$ %.2f 
\nDate Of 
Deposit:%d/%d/%d\n\n",
add.acc_no,add.name,add.dob.month,
add.dob.day,
add.dob.year,add.age,
add.address,
add.citizenship,
add.phone,
                add.acc_type,add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);
                if(strcmpi(add.acc_type,"fixed1")==0)
                    {
                        time=1.0;
                        rate=9;
                        intrst=
interest(time,add.amt,rate);
                        printf("
\n\nYou will get $%.2f as interest on
 %d/%d/%d",intrst,
add.deposit.month,
add.deposit.day,add.deposit.year+1);
                    }
else if(strcmpi(add.acc_type,"fixed2")==0)
                    {
                        time=2.0;
                        rate=11;
     intrst=interest(time,add.amt,rate);
      printf("\n\nYou will get $.%.2f as interest on %d/%d/%d",
intrst,add.deposit.month,
add.deposit.day,add.deposit.year+2);

      }
     else if(strcmpi(add.acc_type,"fixed3")==0)
                    {
                        time=3.0;
                        rate=13;
                        intrst=
interest(time,add.amt,rate);
                        printf("\n\nYou will get $.%.2f as interest on %d/%d/%d",
intrst,add.deposit.month,
add.deposit.day,add.deposit.year+3);

                    }
                 else if(strcmpi(add.acc_type,"saving")==0)
                    {
                        time=(1.0/12.0);
                        rate=8;
                        intrst=interest(time,add.amt,rate);
                        printf("\n\nYou will get $.%.2f as interest on %d of every month",
intrst,add.deposit.day);

                     }
                 else if(strcmpi(add.acc_type,"current")==0)
                    {

                        printf("\n\nYou will get no interest\a\a");

                     }

            }
        }
    }
    else if (choice==2)
    {   printf("Enter the name:");
        scanf("%s",&check.name);
        while (fscanf(ptr,"%d %s
 %d/%d/%d %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,
&add.dob.month,
&add.dob.day,
&add.dob.year,
&add.age,add.address,
add.citizenship,
&add.phone,add.acc_type,
&add.amt,
&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
        {
            if(strcmpi(add.name,
check.name)==0)
            {   system("cls");
                test=1;
                printf("\nAccount 
No.:%d\nName:%s \nDOB:%d/%d/%d
 \nAge:%d 
\nAddress:%s \nCitizenship No:%s
 \nPhone number:%.0lf \nType
 Of Account:%s
 \nAmount deposited:$%.2f \nDate
 Of Deposit:%d/%d/%d\n\n",
add.acc_no,add.name,add.dob.month,
add.dob.day,
add.dob.year,add.age,
add.address,
add.citizenship,add.phone,
                add.acc_type,
add.amt,
add.deposit.month,
add.deposit.day,add.deposit.year);
                if(strcmpi(add.acc_type,
"fixed1")==0)
                    {
                        time=1.0;
                        rate=9;
        intrst=interest(time,add.amt,rate);
                        printf("\n\nYou will
 get $.%.2f as interest on %d/%d/%d",
intrst,add.deposit.month,
add.deposit.day,
add.deposit.year+1);
                    }
                else if(strcmpi(
add.acc_type,"fixed2")==0)
                    {
                        time=2.0;
                        rate=11;
                        intrst=interest(
time,add.amt,rate);
                        printf("\n\n
You will get $.%.2f as interest on %d/%d/%d",intrst,
add.deposit.month,
add.deposit.day,add.deposit.year+2);

                    }
 else if(strcmpi(add.acc_type,"fixed3")==0)
                    {
         time=3.0;
                        rate=13;
                        intrst=interest(time,add.amt,rate);
                        printf("
\n\nYou will get $.%.2f as interest on %d/%d/%d",intrst,add.deposit.month,
add.deposit.day,add.deposit.year+3);

                    }
                 else if(strcmpi(add.acc_type,"saving")==0)
                    {
                 time=(1.0/12.0);
                        rate=8;
       intrst=interest(time,add.amt,rate);
                        printf("\n\nYou will get $.%.2f as
 interest on %d of every month",
intrst,add.deposit.day);

                     }
                 else if(strcmpi(add.acc_type,"current")==0)
                    {

                        printf("\n\n
You will get no interest\a\a");

                     }

            }
        }
    }


    fclose(ptr);
     if(test!=1)
        {   system("cls");
            printf("\nRecord not found!!\a\a\a");
            see_invalid:
              printf("\nEnter 0 to
 try again,1 to return to main menu and 2 to exit:");
              scanf("%d",&main_exit);
              system("cls");
                 if (main_exit==1)
                    menu();
                else if (main_exit==2)
                    close();
                else if(main_exit==0)
                    see();
                else
                    {
                        system("cls");
                        printf("\nInvalid!\a");
                        goto see_invalid;}
        }
    else
        {printf("\nEnter 1 to go to 
the main menu and 0 to exit:");
        scanf("%d",&main_exit);}
        if (main_exit==1)
        {
            system("cls");
            menu();
        }

        else
           {

             system("cls");
            close();
            }

}

Complete Code

#include
#include
#include
int i,j;
int main_exit;
void menu();
struct date{
    int month,day,year;

    };
struct {

    char name[60];
    int acc_no,age;
    char address[60];
    char citizenship[15];
    double phone;
    char acc_type[10];
    float amt;
    struct date dob;
    struct date deposit;
    struct date withdraw;

    }add,upd,check,rem,transaction;

float interest(float t,float amount,int rate)
{
    float SI;
    SI=(rate*t*amount)/100.0;
    return (SI);

}
void fordelay(int j)
{   int i,k;
    for(i=0;ivoid new_acc()

{
    int choice;
    FILE *ptr;

    ptr=fopen("record.dat","a+");
    account_no:
    system("cls");
    printf("\t\t\t\xB2\xB2\xB2\ ADD RECORD  \xB2\xB2\xB2\xB2");
    printf("\n\n\nEnter today's date(mm/dd/yyyy):");
    scanf("%d/%d/%d",
&add.deposit.month,
&add.deposit.day,
&add.deposit.year);
    printf("\nEnter the account number:");
    scanf("%d",&check.acc_no);
    while(fscanf(ptr,"%d %s 
%d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",
&add.acc_no,add.name,
&add.dob.month,
&add.dob.day,
&add.dob.year,&add.age,
add.address,
add.citizenship,
&add.phone,
add.acc_type,&add.amt,
&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
    {
        if (check.acc_no==add.acc_no)
            {printf("Account no. already in use!");
            fordelay(1000000000);
                goto account_no;

            }
    }
    add.acc_no=check.acc_no;
        printf("\nEnter the name:");
    scanf("%s",add.name);
    printf("\nEnter 
the date of birth(mm/dd/yyyy):");
    scanf("%d/%d/%d",
&add.dob.month,
&add.dob.day,
&add.dob.year);
    printf("\nEnter the age:");
    scanf("%d",&add.age);
    printf("\nEnter the address:");
    scanf("%s",add.address);
    printf("\nEnter the citizenship number:");
    scanf("%s",add.citizenship);
    printf("\nEnter the phone number: ");
    scanf("%lf",&add.phone);
    printf("\nEnter the
 amount to deposit:$");
    scanf("%f",&add.amt);
    printf("\nType of account:
\n\t#Saving\n\t
#Current\n\t
#Fixed1(for 1 year)
\n\t#Fixed2(for 2 years)
\n\t#Fixed3(for 3 years)
\n\n\tEnter your choice:");
    scanf("%s",add.acc_type);

        fprintf(ptr,
"%d %s %d/%d/%d %d %s %s
 %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,add.dob.day,
add.dob.year,add.age,
add.address,
add.citizenship,add.phone,
add.acc_type,add.amt,
add.deposit.month,
add.deposit.day,add.deposit.year);


    fclose(ptr);
    printf("\nAccount 
created successfully!");
    add_invalid:
    printf("\n\n\n\t\tEnter 
1 to go to the main menu and 0 to exit:");
    scanf("%d",&main_exit);
    system("cls");
    if (main_exit==1)
        menu();
    else if(main_exit==0)
            close();
    else
        {
            printf("\nInvalid!\a");
            goto add_invalid;
        }
}
void view_list()
{
    FILE *view;
    view=fopen("record.dat","r");
    int test=0;
    system("cls");
    printf("\nACC. NO.\tNAME
\t\t\tADDRESS\t\t\tPHONE\n");

    while(fscanf(view,"%d %s
 %d/%d/%d %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,
&add.dob.month,
&add.dob.day,
&add.dob.year,
&add.age,add.address,
add.citizenship,
&add.phone,
add.acc_type,
&add.amt,&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
       {
           printf("\n%6d\t %10s\t\t\t%10s\t\t%.0lf",add.acc_no,
add.name,add.address,add.phone);
           test++;
       }

    fclose(view);
    if (test==0)
        {   system("cls");
            printf("\nNO RECORDS!!\n");}

    view_list_invalid:
     printf("\n\nEnter 1 
to go to the main menu and 0 to exit:");
        scanf("%d",&main_exit);
        system("cls");
        if (main_exit==1)
            menu();
        else if(main_exit==0)
            close();
        else
        {
            printf("\nInvalid!\a");
            goto view_list_invalid;
        }
}
void edit(void)
{
    int choice,test=0;
    FILE *old,*newrec;
    old=fopen("record.dat","r");
    newrec=fopen("new.dat","w");

    printf("\nEnter the account no. 
of the customer whose 
info you want to change:");
    scanf("%d",&upd.acc_no);
    while(fscanf(old,"%d %s
 %d/%d/%d %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,
&add.dob.month,
&add.dob.day,
&add.dob.year,
&add.age,add.address,
add.citizenship,
&add.phone,
add.acc_type,
&add.amt,&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
    {
        if (add.acc_no==upd.acc_no)
        {   test=1;
            printf("\n
Which information
 do you want to change?\n
1.Address\n2.Phone\n\n
Enter your choice(1
 for address and 
2 for phone):");
            scanf("%d",
&choice);
            system("cls");
            if(choice==1)
                {printf("Enter
 the new address:");
                scanf("%s",upd.address);
                fprintf(newrec,"%d %s
 %d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,add.dob.day,
add.dob.year,add.age,upd.address,
add.citizenship,add.phone,
add.acc_type,add.amt,add.deposit.month,
add.deposit.day,add.deposit.year);
                system("cls");
                printf("Changes saved!");
                }
            else if(choice==2)
                {
                    printf("Enter 
the new phone number:");
                scanf("%lf",
&upd.phone);
                fprintf(newrec,"%d %s
 %d/%d/%d %d %s %s %lf %s
 %f %d/%d/%d\n",
add.acc_no,
add.name,
add.dob.month,
add.dob.day,
add.dob.year,add.age,add.address,
add.citizenship,upd.phone,
add.acc_type,add.amt,add.deposit.month,
add.deposit.day,add.deposit.year);
                system("cls");
                printf("Changes saved!");
                }

        }
        else
            fprintf(newrec,
"%d %s %d/%d/%d 
%d %s %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,add.dob.day,
add.dob.year,add.age,
add.address,
add.citizenship,
add.phone,
add.acc_type,add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);
    }
    fclose(old);
    fclose(newrec);
    remove("record.dat");
    rename("new.dat","record.dat");

if(test!=1)
        {   system("cls");
            printf("\nRecord
 not found!!\a\a\a");
            edit_invalid:
              printf("\nEnter 0 to try 
again,1 to return to main
 menu and 2 to exit:");
              scanf("%d",
&main_exit);
              system("cls");
                 if (main_exit==1)

                    menu();
                else if (main_exit==2)
                    close();
                else if(main_exit==0)
                    edit();
                else
                    {printf("\nInvalid!\a");
                    goto edit_invalid;}
        }
    else
        {printf("\n\n\nEnter 1 
to go to the main menu 
and 0 to exit:");
        scanf("%d",&main_exit);
        system("cls");
        if (main_exit==1)
            menu();
        else
            close();
        }
}

void transact(void)
{   int choice,test=0;
    FILE *old,*newrec;
    old=fopen("record.dat","r");
    newrec=fopen("new.dat","w");

        printf("Enter
 the account no. of the customer:");
    scanf("%d",
&transaction.acc_no);
    while (fscanf(old,
"%d %s %d/%d/%d
 %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name
,&add.dob.month,
&add.dob.day,
&add.dob.year,
&add.age,add.address,
add.citizenship,
&add.phone,
add.acc_type,
&add.amt,
&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
   {

            if(add.acc_no==
transaction.acc_no)
            {   test=1;
                if(strcmpi
(add.acc_type,"fixed1")==0||
strcmpi(add.acc_type,
"fixed2")==0||
strcmpi(add.acc_type,
"fixed3")==0)
                {
                    printf("\a\a\a\n\n
YOU CANNOT DEPOSIT OR WITHDRAW CASH IN FIXED 
ACCOUNTS!!!!!");
                    fordelay(1000000000);
                    system("cls");
                    menu();

                }
                printf("\n\nDo
 you want to\n1.Deposit\n
2.Withdraw?\n\n
Enter your choice(1 for 
deposit and 2 for withdraw):");
                scanf("%d",&choice);
                if (choice==1)
                {
                    printf("Enter 
the amount you want to deposit:$ ");
                    scanf("%f"
,&transaction.amt);
                    add.amt+=transaction.amt;
                    fprintf(
newrec,"%d %s %d/%d/%d %d
 %s %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,
add.dob.day,
add.dob.year,
add.age,add.address,
add.citizenship,
add.phone,
add.acc_type,add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);
                    printf("\n\n
Deposited successfully!");
                }
                else
                {
                    printf("Enter 
the amount you want
 to withdraw:$ ");
                    scanf("%f",&transaction.amt);
                    add.amt-=transaction.amt;
                    fprintf(newrec,
"%d %s %d/%d/%d %d %s
 %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,
add.dob.day,
add.dob.year,
add.age,add.address,
add.citizenship,
add.phone,add.acc_type,
add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);
                    printf("\n\nWithdrawn
 successfully!");
                }

            }
            else
            {
               fprintf(newrec,"%d %s
 %d/%d/%d %d %s %s %lf %s
 %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,
add.dob.day,add.dob.year,
add.age,add.address,
add.citizenship,
add.phone,add.acc_type,
add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);
            }
   }
   fclose(old);
   fclose(newrec);
   remove("record.dat");
   rename("new.dat","record.dat");
   if(test!=1)
   {
       printf("\n\nRecord
 not found!!");
       transact_invalid:
      printf("\n\n\nEnter 
0 to try 
again,1 to return to main 
menu and 2 to exit:");
      scanf("%d",&main_exit);
      system("cls");
      if (main_exit==0)
        transact();
    else if (main_exit==1)
        menu();
    else if (main_exit==2)
        close();
    else
    {
        printf("\nInvalid!");
        goto transact_invalid;
    }

   }
   else
   {
       printf("\nEnter 1 to 
go to the main menu and 0 to exit:");
        scanf("%d",&main_exit);
        system("cls");
        if (main_exit==1)
            menu();
        else
            close();
   }

}
void erase(void)
{
    FILE *old,*newrec;
    int test=0;
    old=fopen("record.dat","r");
    newrec=fopen("new.dat","w");
    printf("Enter the 
account no.
 of the customer you
 want to delete:");
    scanf("%d",&rem.acc_no);
    while (fscanf(old,"%d %s 
%d/%d/%d %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,&add.dob.month,
&add.dob.day,
&add.dob.year,
&add.age,add.address,
add.citizenship,
&add.phone,
add.acc_type,
&add.amt,
&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
   {
        if(add.acc_no!=rem.acc_no)
            fprintf(newrec,"%d %s
 %d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",
add.acc_no,add.name,
add.dob.month,
add.dob.day,
add.dob.year,add.age,
add.address,
add.citizenship,add.phone,
add.acc_type,
add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);

        else
            {test++;
            printf("\nRecord deleted 
successfully!\n");
            }
   }
   fclose(old);
   fclose(newrec);
   remove("record.dat");
   rename("new.dat","record.dat");
   if(test==0)
        {
            printf("\nRecord not 
found!!\a\a\a");
            erase_invalid:
              printf("\nEnter 0 to try 
again,1 to return to main 
menu and 2 to exit:");
              scanf("%d",&main_exit);

                 if (main_exit==1)
                    menu();
                else if (main_exit==2)
                    close();
                else if(main_exit==0)
                    erase();
                else
                    {printf("\nInvalid!\a");
                    goto erase_invalid;}
        }
    else
        {printf("\nEnter 1 to go 
to the main menu and 0 to exit:");
        scanf("%d",&main_exit);
        system("cls");
        if (main_exit==1)
            menu();
        else
            close();
        }

}

void see(void)
{
    FILE *ptr;
    int test=0,rate;
    int choice;
    float time;
    float intrst;
    ptr=fopen("record.dat","r");
    printf("Do you want to 
check by\n1.Account no\n
2.Name\nEnter your choice:");
    scanf("%d",&choice);
    if (choice==1)
    {   printf("Enter the account number:");
        scanf("%d",&check.acc_no);

        while (fscanf(ptr,"%d %s %d/%d/%d
 %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,
&add.dob.month,
&add.dob.day,
&add.dob.year,
&add.age,add.address,
add.citizenship,
&add.phone,add.acc_type,
&add.amt,
&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
        {
            if(add.acc_no==check.acc_no)
            {   system("cls");
                test=1;

                printf("\nAccount NO.:%d
\nName:%s \nDOB:%d/%d/%d 
\nAge:%d \nAddress:%s 
\nCitizenship No:%s \n
Phone number:%.0lf \nType Of Account:%s 
\nAmount deposited:$ %.2f 
\nDate Of Deposit:%d/%d/%d\n\n",
add.acc_no,add.name,
add.dob.month,add.dob.day,
add.dob.year,add.age,
add.address,
add.citizenship,
add.phone,
                add.acc_type,add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);
                if(strcmpi(
add.acc_type,"fixed1")==0)
                    {
                        time=1.0;
                        rate=9;
                        intrst=interest(
time,add.amt,rate);
               printf("\n\nYou will get $%.2f as interest on %d/%d/%d",
intrst,add.deposit.month,
add.deposit.day,add.deposit.year+1);
                    }
                else if(
strcmpi(add.acc_type,"fixed2")==0)
                    {
                        time=2.0;
                        rate=11;
                        intrst=interest(
time,add.amt,rate);
                        printf(
"\n\nYou will get $.%.2f as interest on %d/%d/%d",
intrst,add.deposit.month,
add.deposit.day,
add.deposit.year+2);

                    }
                else if(strcmpi(
add.acc_type,"fixed3")==0)
                    {
                        time=3.0;
                        rate=13;
                        intrst=interest(
time,add.amt,rate);
                        printf(
"\n\nYou will get $.%.2f as interest on %d/%d/%d",
intrst,add.deposit.month,
add.deposit.day,add.deposit.year+3);

                    }
                 else if(strcmpi(
add.acc_type,"saving")==0)
                    {
                        time=(1.0/12.0);
                        rate=8;
                        intrst=interest(
time,add.amt,rate);
                        printf("
\n\n
You will get $.%.2f as 
interest on %d 
of every month",
intrst,add.deposit.day);

                     }
                 else if(strcmpi(
add.acc_type,"current")==0)
                    {

                        printf("
\n\nYou will get no interest\a\a");

                     }

            }
        }
    }
    else if (choice==2)
    {   printf("Enter the name:");
        scanf("%s",&check.name);
        while (fscanf(ptr,"%d %s 
%d/%d/%d %d %s %s %lf %s %f %d/%d/%d",
&add.acc_no,add.name,
&add.dob.month,
&add.dob.day,
&add.dob.year,
&add.age,
add.address,
add.citizenship,&add.phone,
add.acc_type,
&add.amt,
&add.deposit.month,
&add.deposit.day,
&add.deposit.year)!=EOF)
        {
            if(strcmpi(add.name,check.name)==0)
            {   system("cls");
                test=1;
                printf("\nAccount No.:%d
\nName:%s \nDOB:%d/%d/%d 
\nAge:%d \nAddress:%s 
\nCitizenship No:%s 
\nPhone number:%.0lf 
\nType Of Account:%s 
\nAmount deposited:$%.2f 
\nDate Of Deposit:%d/%d/%d\n\n",
add.acc_no,add.name,
add.dob.month,
add.dob.day,
add.dob.year,
add.age,add.address,
add.citizenship,
add.phone,
                add.acc_type,add.amt,
add.deposit.month,
add.deposit.day,
add.deposit.year);
                if(strcmpi(
add.acc_type,"fixed1")==0)
                    {
                        time=1.0;
                        rate=9;
                        intrst=
interest(time,add.amt,rate);
                        printf("
\n\nYou will get $.%.2f as interest 
on %d/%d/%d",intrst,
add.deposit.month,
add.deposit.day,
add.deposit.year+1);
                    }
                else if(strcmpi(
add.acc_type,"fixed2")==0)
                    {
                        time=2.0;
                        rate=11;
                        intrst=interest(
time,add.amt,rate);
                        printf("\n\n
You will get $.%.2f as interest on
 %d/%d/%d",intrst,
add.deposit.month,
add.deposit.day,
add.deposit.year+2);

                    }
                else if(strcmpi(
add.acc_type,"fixed3")==0)
                    {
                        time=3.0;
                        rate=13;
                        intrst=
interest(time,add.amt,rate);
                        printf("
\n\nYou will get $.%.2f 
as interest on %d/%d/%d",intrst,
add.deposit.month,
add.deposit.day,
add.deposit.year+3);

                    }
                 else if(strcmpi(
add.acc_type,"saving")==0)
                    {
                        time=(1.0/12.0);
                        rate=8;
                        intrst=interest(
time,add.amt,rate);
                        printf("
\n\nYou will get $.%.2f as 
interest on %d of every month",
intrst,add.deposit.day);

                     }
                 else if(strcmpi(
add.acc_type,"current")==0)
                    {

                        printf("\n\nYou will get no interest\a\a");

                     }

            }
        }
    }


    fclose(ptr);
     if(test!=1)
        {   system("cls");
            printf("\nRecord not 
found!!\a\a\a");
            see_invalid:
              printf("\nEnter 0 to
 try again,1 to return to main menu and 2 to exit:");
              scanf("%d",&main_exit);
              system("cls");
                 if (main_exit==1)
                    menu();
                else if (main_exit==2)
                    close();
                else if(main_exit==0)
                    see();
                else
                    {
                        system("cls");
                        printf("\nInvalid!\a");
                        goto see_invalid;}
        }
    else
        {printf("\nEnter 1 to go
 to the main menu and 0 to exit:");
        scanf("%d",&main_exit);}
        if (main_exit==1)
        {
            system("cls");
            menu();
        }

        else
           {

             system("cls");
            close();
            }

}


void close(void)
{
    printf("\n\n\n\nThis C 
Mini Project is developed by Code With C team!");
    }


void menu(void)
{   int choice;
    system("cls");
    system("color 8");
    printf("\n\n\t\t\tCUSTOMER
ACCOUNT BANKING MANAGEMENT SYSTEM");
    printf("
\n\n\n\t\t\t\xB2\xB2\xB2\xB2\xB2\xB2\xB
2 WELCOME TO THE MAIN MENU 
\xB2\xB2\xB2\xB2\xB2\xB2\xB2");
    printf("\n\n\t\t
1.Create new account\n\t\t
2.Update information of 
existing account\n\t\t
3.For transactions\n\t\t
4.Check the details of
 existing account\n\t\t5.Removing 
existing account\n\t\t
6.View customer's list\n\t\t
7.Exit\n\n\n\n\n\t\t Enter your choice:");
    scanf("%d",&choice);

    system("cls");
    switch(choice)
    {
        case 1:new_acc();
        break;
        case 2:edit();
        break;
        case 3:transact();
        break;
        case 4:see();
        break;
        case 5:erase();
        break;
        case 6:view_list();
        break;
        case 7:close();
        break;

    }



}
int main()
{
    char pass[20],password[20]="banklogin";
    int i=0;
    printf("\n\n\t\tEnter the
 password to login:");
    scanf("%s",pass);

    if (strcmp(pass,password)==0)
        {printf("\n\nPassword 
Match!\nLOADING");
        for(i=0;i<=6;i++)
        {
            fordelay(100000000);
            printf(".");
        }
                system("cls");
            menu();
        }
    else
        {   printf("\n\nWrong 
password!!\a\a\a");
            login_try:
            printf("\nEnter 1 to try 
again and 0 to exit:");
            scanf("%d",&main_exit);
            if (main_exit==1)
                    {

                        system("cls");
                        main();
                    }

            else if (main_exit==0)
                    {
                    system("cls");
                    close();}
            else
                    {printf("\nInvalid!");
                    fordelay(1000000000);
                    system("cls");
                    goto login_try;}

        }
        return 0;
}

Conclusion:

This C Beginner Project successfully simulates a real-world bank through a console-based application. Developed using the GCC compiler, the Bank Management System allows users to experience core banking functionalities, including account creation, transaction processing (credits and debits), and account management. This project provides a valuable learning experience for beginners in C programming by demonstrating practical application of key concepts.

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