Question

How to convert an integer to a binary string with a fixed size in Go

Answer 1

package main

import (
    "fmt"
    "strings"
)

// Converts an integer to a binary string with a fixed size
func binStr(n, size int) string {
    var builder strings.Builder
    for i := size - 1; i >= 0; i-- {
        if (n>>i)&1 == 1 {
            builder.WriteByte('1')
        } else {
            builder.WriteByte('0')
        }
    }
    return builder.String()
}


func main() {
    var x, size int

    x = 5
    size = 8
    fmt.Println(binStr(x, size))
    
    fmt.Println(binStr(15, size))
}



/*
run:

00000101
00001111

*/

 

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