A Tour of Go exercise

sqrt.go

// Implement square root calculation

package main

import (
    "fmt"
    "math"
)

// my solution
func Sqrt(x float64) (float64, float64) {
    z := x/2
    zp := x
    i := 1
    for math.Abs(z-zp) > 0.000000000000001 {
        zp = z
        z -= (z*z - x) / (2*z)
        i++
        //fmt.Println("z is", z)
    }
    fmt.Println("loop count:", i)
    return zp
}

func main() {
    n := 99     // change to any real number
    fmt.Println("My calculation:", Sqrt(n))
    fmt.Println("Library result:", math.Sqrt(n))
}