46 lines
937 B
Go
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)
|
|
}
|