Mandelbrot set

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Mandelbrot set
You are encouraged to solve this task according to the task description, using any language you may know.

Generate and draw the Mandelbrot set.

C

Works with: gcc

<lang C>

1. define MAX_ITERATIONS 500

void draw(int width, int height){

 int x, y, colour;
 double x0, y0, xtemp, cr, ci;

 for (x = 0; x < width, x++){
   for (y = 0; y < height; y++){
     x0 = y0 = 0;
     cr = ((double)x / (double)width - 0.5);
     ci = ((double)y / (double)height - 0.5);
     i = 0;

     while (x0*x0 + y0*y0 <= 4.0 && i < MAX_ITERATIONS){
       xtemp = x0*x0 - y0*y0 + cr;
       y0 = 2*x0*0 + ci;
       x0 = xtemp;
       i++;
     }

     /* points in the set are coloured as white, others are coloured black. */
     colour = (i == MAX_ITERATIONS ? 255 : 0);

     DrawPixel(x, y, colour, colour, colour);
   }
 }

} </lang>