Go Language Learning---errors

This is a creation in Article, where the information may have evolved or changed.

Error

errors are anything you can describe yourself with a string. The main idea is to return the string by the predefined built -in interface type ' Error ', and the method ' error ':

Type Error Interface {    error () string}

fmtThis method is called automatically when you output one of several different print functions for a package error .

Here is an example

    the basic data type of package Mainimport ("FMT") type myfloat float64  //go cannot directly increment functions, only first define a own data type, func (Data myfloat) Error () string{    return FMT. Sprintf ("Cannot sqrt negative number:%f", data)}func sqrt (f float64) (Float64, error) {    If f < 0 {        var data my float        data = myfloat (f)        return 0, data    }    return 0, Nil}func main () {    fmt. Println (SQRT (2))    FMT. Println (Sqrt (-2))}

reference: http://go-tour-zh.appspot.com/#54