In this Go example tutorial we will cover take user input in Go Lang. The user input can be added by using bufio package and fmt package.
Create an Input with bufio Package
This is the basic syntax to create an input in Go with bufio package.
// create an input reader
var reader *bufio.Reader = bufio.NewReader(os.Stdin)
// get the input
var_name, err := reader.ReadString(delimiter)
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In this example, the input is used in this program.
package main
import (
"bufio"
"fmt"
"os"
)
func main() {
// create an input reader
var reader *bufio.Reader = bufio.NewReader(os.Stdin)
fmt.Println("Enter your name: ")
// receive an input
// then save it to the name variable
name, _ := reader.ReadString('\n')
fmt.Println("Enter you age: ")
// receive an input
// then save it to the age variable
age, _ := reader.ReadString('\n')
fmt.Println("Hello, ", name)
fmt.Println("Your age is: ", age)
}
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Output
Enter your name:
aiden jackson
Enter you age:
25
Hello, aiden jackson
Your age is: 25
Based on the code above, the reader is created then the input is received using ReadString('\n') method. The inputs are saved in name and age variable then the value from these variables is printed out.
Create an Input with fmt Package
This is the basic syntax to create an input with fmt package.
How do we calculate sum of two number from user input using Go Lang?
package main
import (
"fmt"
)
func main() {
// create some variables to store the inputs
var firstNum int
var secondNum int
// receive some inputs
fmt.Println("Enter first number: ")
fmt.Scanln(&firstNum)
fmt.Println("Enter second number: ")
fmt.Scanln(&secondNum)
// calculate the sum of two numbers
var result int = firstNum + secondNum
// print out the result
fmt.Println("The result: ", result)
}
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Output
Enter first number:
5
Enter second number:
7
The result: 12
Based on the code above, the input is received with Scanln() method with variable name as the parameter.
How do we calculate average of numbers from user input using Go Lang?
package main
import (
"fmt"
)
func main() {
// create some variables
var n int
var data int
fmt.Println("Average Calculator")
fmt.Println("Enter the amount of data: ")
// receive the amount of data
fmt.Scanln(&n)
var nums []int = []int{}
for i := 1; i <= n; i++ {
fmt.Println("Enter the number: ")
// receive the numbers
fmt.Scanln(&data)
nums = append(nums, data)
}
// calculate the average then print out the result
var averageResult int = average(nums)
fmt.Println("Average result: ", averageResult)
}
// create a function to calculate the average
func average(nums []int) int {
var sum int = 0
for _, num := range nums {
sum += num
}
var result int = sum / len(nums)
return result
}
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Output
Average Calculator
Enter the amount of data:
5
Enter the number:
1
Enter the number:
2
Enter the number:
3
Enter the number:
4
Enter the number:
5
Average result: 3
Based on the code above, the amount of data and data that will be calculated is received from the user input. Then the average calculation is performed.
I hope this article is helpful to learn how to create an user input in Go programming language.
