package main

import (
	"fmt"
	"os"
	"strconv"
)

const xmin float64 = -2.0
const xmax float64 = 1.0
const ymin float64 = -1.0
const ymax float64 = 1.0

func escapes(cr float64, ci float64, it int) rune {
	var zr float64 = 0
	var zi float64 = 0
	var zrtmp float64

	for i := 0; i < it; i++ {
		// z <- z^2 + c
		zrtmp = zr*zr - zi*zi + cr
		zi = 2*zr*zi + ci
		zr = zrtmp
		if zr*zr+zi*zi > 4 {
			return ' '
		}
	}
	return 'X'
}

func main() {
	var x, y float64
	xstep, _ := strconv.Atoi(os.Args[1])
	ystep, _ := strconv.Atoi(os.Args[2])
	iters, _ := strconv.Atoi(os.Args[3])

	for yc := 0; yc < ystep; yc++ {
		y = float64(yc)*(ymax-ymin)/float64(ystep) + ymin
		for xc := 0; xc < xstep; xc++ {
			x = float64(xc)*(xmax-xmin)/float64(xstep) + xmin
			fmt.Print(string(escapes(x, y, iters)))
		}
		fmt.Println()
	}
}