We have discussed the Hello World program before. Let's discuss it more briefly. From this explanation, we will know about the program structure of the C language.
Here are the following parts of the C program-
Processor Commands
Functions
Variables
Statements
Expressions
Comments
Let's watch this Hello World program
|
#include <stdio.h>
int main() { /* This is my first hello world program in C */ printf("Hello World! \n");
return 0; } |
Output-
Hello World
In the first line, "#include<stdio.h>" is a preprocessor command that informs the compiler to include stdio.h before performing the whole compilation.
The next line is "int main()" which is the main function from where the program execution begins.
The next line inside /*.....*/ will be fully ignored by the compiler as this syntax is used to insert comments inside the C program.
There is a "printf()" in the next line that is a function used to print some statements in C language. If you write "Hello World" inside this function then it will usually print the Hello World statement in the C console.
We have used "return 0" in the next line that terminates the main() function and returns the appropriate value i.e. 0.
How to Compile and Execute C program
To get the result of the code we must need to compile and execute the program in C language. Let's see how to compile and run it in the C compiler.
Open the C compiler and write the above code in the console.
Now check the indentations and then save the file as "Hello.c"
Now click on execute from the above menu and it will print the output of the program in the output console.
If you are using a Text Editor then use the following steps.
Open the C compiler and write the above code in the console.
Save the file as "Hello.c"
Now open a command prompt and go to the directory where your file is saved.
Now type the following code
gcc Hello.c
Press enter to compile your code in a command prompt.
If there are no errors then it will generate the a.out executable file.
Type the following code to execute your program.
a.out
You will see the output in your console.
Hello World
If you are facing any error then please recheck your code and the path of the saved file you entered.