package main

import (

    "fmt"

    "errors"

)

func main() {

    erro1 := fmt.Errorf("%s", "this is a nomal erorr")

    fmt.Println("error1 = ", erro1)

    error2 := errors.New("this is a normal error")

    fmt.Println("eror2 = ", error2)

}

package main

import (

    "errors"

    "fmt"

)

func MyDiv(a, b int) (result int, err error) { //这里定义了err为error的接口类型

    err = nil

    if b ==  {

        err = errors.New("分母不能为0")

    }else {

        result = a / b

    }

    return

}

func main() {

    result, err := MyDiv(, )

    if err != nil {

        fmt.Println("error = ", err)

    }else {

        fmt.Println("reuslt = ", result)

    }

}