GCD (greatest common denominator) commandline utility, implementation based on Euclid

main.go

package main

import (
        "os"
        "strconv"
)

func euclid(i, j int) int {
        for i != j {
                if i > j {
                        i -= j
                } else {
                        j -= i
                }
        }
        return i
}

func main() {
        n1, err := strconv.Atoi(os.Args[1])
        if err != nil {
                panic(err)
        }
        n2, err := strconv.Atoi(os.Args[2])
        if err != nil {
                panic(err)
        }
        os.Exit(euclid(n1, n2))
}