Go 錯誤處理

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// errmsg.gopackage mainimport ("errors""fmt")type DivideError struct {dividee intdivider int}func (de *DivideError) Error() string {strFormat := `Cannot proceed, the divider is zero.dividee: %ddivider: %d`return fmt.Sprintf(strFormat, de.dividee, de.divider)}func PrintErrTest() error {return errors.New("error!!!!")}func Divide(varDividee int, varDivider int) (result int, errormsg string) {if varDivider == 0 {dData := DivideError{dividee: varDividee,divider: varDivider,}errormsg = dData.Error()return} else {return varDividee / varDivider, ""}}func main() {//  1error := PrintErrTest()if error != nil {fmt.Println(error)}// 2if result, errorMsg := Divide(100, 10); errorMsg == "" {fmt.Println("100/10 =", result)}if _, errorMsg := Divide(100, 0); errorMsg != "" {fmt.Println("errorMsg is :", errorMsg)}}

輸出：

error!!!!100/10 = 10errorMsg is : Cannot proceed, the divider is zero.dividee: 100divider: 0