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Newton's method, solving https://tour.golang.org/flowcontrol/8
package main
import (
"fmt"
"math"
)
func Sqrt(x float64) float64 {
z := 1.0
l := 0.0
for math.Abs(z-l)>9e-15 {
l = z
z = z - (z*z - x)/(2*z)
}
return z
}
func main() {
fmt.Println(Sqrt(2))
fmt.Println(math.Sqrt(2))
}
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