package main
import (
"fmt"
"os"
"strconv"
)
func main() {
//fmt.Println(os.Args)
if len(os.Args) != 4 {
fmt.Println("Usage: calc.go NUMBER OPERATOR NUMBER")
os.Exit(0)
}
var a, _ = strconv.Atoi(os.Args[1])
var op = os.Args[2]
var b, _ = strconv.Atoi(os.Args[3])
var result int
switch op {
case "+":
result = a + b
case "*":
result = a * b
case "/":
if b == 0 {
fmt.Println("Cannot devide by 0")
os.Exit(1)
}
result = a / b
case "-":
result = a - b
default:
fmt.Printf("Operator '%s' is not handled.\n", op)
os.Exit(1)
}
fmt.Println(result)
}