Exercise: Loops and Functions. Solution

exercise-loops-and-functions.go

import (
	"fmt"
	"math"
)

var j int = 10

func Sqrt(x float64) float64 {
	return math.Sqrt(x)
}

func main() {
	z := 10.0
	x := 17002.0
	fmt.Printf("x is %v\n", x)
	fmt.Printf("The square root solution from math = %v\n", Sqrt(x))
	fmt.Printf("The starting value of z = %v\n", z)
	for i := 0; i < j; i++ {
		z -= (z*z - x) / (2 * z)
		if z == Sqrt(x) {
			fmt.Printf("It took %v iterations to find z\n", i)
			fmt.Printf("Final value of z = %v, x was %v ", z, x)
			break
		}
	}
	fmt.Printf("Z not found in %v iterations\n", j)
}