Square Root Output

gistfile1.txt

Starting from '10'...
5:   0.722471690979458
10:  0.7071067811865475
15:  0.7071067811865475
20:  0.7071067811865475

Starting from '100,000'...
5:   3125.00005328125
10:  97.65795665907389
20:  0.7071072944225515
30:  0.7071067811865475

gistfile2.go

package main

import (
    "fmt"
)

func Sqrt(x float64, start float64, iter int) float64 {
    for i := 0; i < iter; i++ {
        start = .5 * (start + (x / start))
    }
    return start
}

func main() {
    fmt.Println("Starting from '10'...")
    fmt.Println("5:  ", Sqrt(.5, 10, 5))
    fmt.Println("10: ",Sqrt(.5, 10, 10))
    fmt.Println("15: ",Sqrt(.5, 10, 15))
    fmt.Println("20: ",Sqrt(.5, 10, 20))
    fmt.Println("")
    fmt.Println("Starting from '100,000'...")
    fmt.Println("5:  ", Sqrt(.5, 100000, 5))
    fmt.Println("10: ", Sqrt(.5, 100000, 10))
    fmt.Println("20: ", Sqrt(.5, 100000, 20))
    fmt.Println("30: ", Sqrt(.5, 100000, 30))
}