reverse an int (friend's interview question)

main.go

package main

import (
	"fmt"
)

func reverse(input int) int {
	var result int
	for ; input != 0; input = input / 10 {
		result = input%10 + 10*result
	}
	return result
}

func main() {
	fmt.Println(reverse(103234234))
}

432432301

since decimal numbers are in base10, mod 10 will give you the "ones" column, and create a new decimal number by dividing the original value by 10.