golang - example switch statement

main.go

package main

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

var arg1 = os.Args[1]
var arg2 = os.Args[2]
var arg3 = os.Args[3]

func main() {

	num1, _ := strconv.ParseFloat(arg2, 64)
	num2, _ := strconv.ParseFloat(arg3, 64)

	switch {
	case arg1 == "add":
		fmt.Println(num1 + num2)
	case arg1 == "subtract":
		fmt.Println(num1 - num2)
	case arg1 == "multiply":
		fmt.Println(num1 * num2)
	case arg1 == "divide":
		fmt.Println(num1 / num2)
	}
}