Created
April 15, 2016 09:41
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go language exercise
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| package main | |
| import ( | |
| "fmt" | |
| "math" | |
| ) | |
| type ErrNegativeSqrt float64 | |
| func (e ErrNegativeSqrt) Error() string { | |
| return fmt.Sprintf("cannot Sqrt negative number: %f\n", e) | |
| } | |
| func Sqrt(x float64) (float64, error) { | |
| if x < 0 { | |
| return 0, ErrNegativeSqrt(x) | |
| } else { | |
| return math.Sqrt(x), nil | |
| } | |
| } | |
| func main() { | |
| fmt.Println(Sqrt(2)) | |
| fmt.Println(Sqrt(-2)) | |
| } |
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