package main

import "fmt"

func div(a, b int) (int, error) {
	if b == 0 {
		return 0, fmt.Errorf("Сan't divide '%v' by zero", a)
	}
	return a / b, nil
}

func printResult(result int, err error) {
	if err != nil {
		fmt.Println(err)
	} else {
		fmt.Println(result)
	}
}

func main() {
	a, b := 10, 2
	printResult(div(a, b)) // 5
	a, b = 4, 0
	printResult(div(a, b)) // Сan't divide '4' by zero
}