### 實例 error值負責一些普通的錯誤.只是返回錯誤信息,不會讓程序崩掉. ~~~ = func MyDiv(a, b int) (res int, err error) { err = nil if b == 0 { err = errors.New("除數不能為零") } else { res = a / b } return } func main() { err1 := fmt.Errorf("%s", "this is normal err") fmt.Println(err1) err2 := errors.New("this is normal err2") fmt.Println(err2) res, err := MyDiv(10, 0) if err != nil { fmt.Println(err) } else { fmt.Println(res) } } ~~~ ~~~ this is normal err this is normal err2 除數不能為零 ~~~