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A Tour of Go Exercise: Loops and Functions
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| package main | |
| import ( | |
| "fmt" | |
| "math" | |
| ) | |
| func Sqrt(x float64) float64 { | |
| z := 1.0 | |
| for { | |
| z2 := z - (z * z - x) / (z * 2) | |
| if math.Abs(z2 - z) < 1e-10 { | |
| break | |
| } | |
| z = z2 | |
| } | |
| return z | |
| } | |
| func main() { | |
| fmt.Println(Sqrt(2)) | |
| fmt.Println(math.Sqrt(2)) | |
| } |
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