Files
2019-10-30 19:41:13 +03:00

46 lines
937 B
Go

// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"fmt"
"os"
"strconv"
)
func main() {
// lesson: error handling + short decl. assignment
if len(os.Args) != 3 {
fmt.Println("Usage: calc <number1> <number2>")
return
}
a, err := strconv.ParseFloat(os.Args[1], 64)
if err != nil {
fmt.Println("Please provide a valid number")
return
}
b, err := strconv.ParseFloat(os.Args[2], 64)
if err != nil {
fmt.Println("Please provide a valid number")
return
}
// err1 := ...
// err2 := ...
// if err1 != nil || err2 != nil {
// fmt.Println("Please provide a valid number")
// return
// }
fmt.Printf("%v + %v = %v\n", a, b, a+b)
}