sample exerise

sqrt.go

package main

import (
    "fmt"
    "math"
)

func Sqrt(x float64) float64 {
    z := float64(1);
    old := float64(3);
    delta := float64(.00000001);
    for math.Abs(old - z) > delta {
        old = z;
        z = z - ((z*z - x)/(2*z));
    }
    return z;
}

func main() {
    fmt.Println(Sqrt(1))
    fmt.Println(Sqrt(2))
    fmt.Println(Sqrt(3))
    fmt.Println(Sqrt(4))
}