gosqrt.go

package main

import (
    "fmt"
    "math"
)

func Sqrt(x float64) (float64, int) {
    
    z := float64(x)
    thres := .0000001
    count := 0
    var prev float64
    
    for ;; count++{
        
        // Do calculation
        top := z*z - x 
        bot := 2 * z
        div := top/bot
        z = z - div
        
        // First time behavior
        if count == 0 { prev = z; continue }
        
        // Calculate diff
        diff := prev - z
        
        // Check against the threshold
        if diff < thres {
            break
        }
        
        // Setup the next
        prev = z
    }
    
    return z, count
}

func main() {
    x := 200000.0
    ret, loop := Sqrt(x)
    
    fmt.Println("mine: ",ret, loop )
    fmt.Println("yours:", math.Sqrt(x))
    
}