ユークリッドの互除法

EuclideanMethod.go

package main

import (
	"fmt"
	"os"
	"strconv"
)

func main() {
	val1, err1 := strconv.Atoi(os.Args[1])
	val2, err2 := strconv.Atoi(os.Args[2])

	if err1 != nil || err2 != nil {
		val1, val2 = 1, 1
	}

	result1, _ := EuclideanMethod(val1, val2)
	fmt.Println(result1)
}

func EuclideanMethod(val1 int, val2 int) (int, int) {
	if val2 == 0 {
		return val1, val2
	} else if val2 > val1 {
		result := val2 % val1
		return EuclideanMethod(val1, result)
	} else {
		result := val1 % val2
		return EuclideanMethod(val2, result)
	}
}