Myrddin: Playground

Code

use std
use bio

/* Controls when we finish the iterations */
const Bailout : flt64 = 16.0
const Maxiter = 1000

const main = {args : byte[:][:]
    /* Declarations with types */
    var x : flt64, y : flt64, i, f

    /* create a buffered wrapper for stdio */
    f = bio.mkfile(1, bio.Wr)
    /* iterate over the range of interest, and draw the fractal */
    for y = -39.0; y < 39.0; y = y + 1.0
        for x = -39.0; x < 39.0; x = x + 1.0
            i = mandelbrot(x/40.0, y/40.0)
            if i == 0
                bio.putc(f, '*')
            else
                bio.putc(f, ' ')
            ;;
        ;;
        bio.putc(f, '\n')
    ;;
    bio.putc(f, '\n')
    bio.flush(f)
}

const mandelbrot = {x, y
    var cr, ci, zr, zi
    var tmp, zr2, zi2
    var i : int 

    cr = y - 0.5
    ci = x
    zr = 0.0
    zi = 0.0
    i = 0 

    while true
        i++
        tmp  = zr * zi
        zr2 = zr * zr
        zi2 = zi * zi
        zr = zr2 - zi2 + cr
        zi = tmp + tmp + ci
        if zi2 + zr2 > Bailout
            -> i
        ;;
        if i > Maxiter
            -> 0
        ;;
    ;;
    std.die("unreachable")
}

Run!

Press 'Run' to see output!