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                編寫好的異常處理 === Go語言提倡快速失敗 把要向檢測的內容放到最前 ~~~ func division(a,b int) (int,error) { if a >= 0 && b > 0 { c := int(a/b) return c,nil } return 0,errors.New("0 不能") } func TestDivision(t *testing.T) { //i, e := division(3, 4) i, e := division(3, 0) if e != nil { t.Fatal(e.Error()) } fmt.Println(i) } ~~~ ### 如果要對錯誤后續作判斷,需要預先定義錯誤,然后最比對 ~~~ var ( LessZeroError = errors.New("0錯誤") ) func division(a,b int) (int,error) { if a >= 0 && b > 0 { c := int(a/b) return c,nil } return 0,LessZeroError } func TestDivision(t *testing.T) { //i, e := division(3, 4) i, e := division(3, 0) if e != nil { t.Fatal(e.Error()) } fmt.Println(i) } ~~~
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