Learning Go...

00-learning-Go.txt

Learning Go, following the "Go tour"

01-sqrt-newton.go

package main

import (
	"fmt"
	"math"
)

func Sqrt(x float64) (z float64) {
	z = float64(1)
	for w := float64(0); math.Abs(z-w) >= 1e-10; {
		fmt.Println(w, z)
		w = z
		z = z - (z*z - x) / (2*z)
	}
	return
}

func main() {
	fmt.Println(Sqrt(50))
	fmt.Println(math.Sqrt(50))
}

02-exercise-slices.go

package main

import "golang.org/x/tour/pic"

func Pic(dx, dy int) [][]uint8 {
	pic := make([][]uint8, dy)
	for y := range pic {
		pic[y] = make([]uint8, dx)
		for x := range pic[y] {
			pic[y][x] = uint8((x+y)/2)
		}
	}
	return pic
}

func main() {
	pic.Show(Pic)
}