C Code for Mandelbrot Set

Here is some code for generating the Mandelbrot set in C, so if you've got a C compiler, why not give it a go.

#include "stdio.h"

#define MaxIters 200
#define SIZE     80
#define BLACK    -1
#define LEFT     -2.0
#define RIGHT    1.0
#define TOP      1.0
#define BOTTOM   -1.0

main(int argc, char *argv[])
{
    short   x, y, counter;
    long double zr, zi, cr, ci
    long double rsquared, isquared;

    for (y = 0; y < SIZE; y++)
    {
        for (x = 0; x < SIZE; x++)
        {
            zr = 0.0;
            zi = 0.0;
            cr = LEFT + x * (RIGHT - LEFT) / SIZE;

            ci = TOP + y * (BOTTOM - TOP) / SIZE;
            rsquared = zr * zr;
            isquared = zi * zi;

            for (counter = 0; rsquared + isquared <= 4.0
                            && counter < MaxIters; counter++)
            {
                zi = zr * zi * 2;
                zi += ci;

                zr = rsquared - isquared;
                zr += cr;

                rsquared = zr * zr;
                isquared = zi * zi;
            }

            if (rsquared + isquared <= 4.0)
                printf("*");    /* In the set. */
            else
                printf(" ");    /* Not in the set. */
        }
        printf("\n");
    }
    return 0;


Copyright © 1997 Cygnus Software. All rights reserved.
Many thanks to the above for the code which was in the Fractal
Extreme help file.

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