Unit 1, Mandelbrot (v1)

#include <stdio.h>

int const MAX_ITER = 256;

int main(void) {
    int height, width;

    printf("Enter size of the fractal (height and width)\n");
    scanf("%d\n%d", &width, &height);

    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            float x0 = (3.5 / width) * x - 2.5;
            float y0 = (2.0 / height) * y - 1;
            float xi, yi = 0.0;
            int iteration = 0;

            while ((((xi * xi) + (yi * yi)) < 4) &&
                   (iteration < MAX_ITER)) {
                float xtemp = (xi * xi) - (yi * yi) + x0;
                yi = (2 * xi * yi) + y0;
                xi = xtemp;
                iteration++;
            }

            if (iteration == MAX_ITER)
                printf(" ");
            else {
                switch ((iteration - 1) % 8) {
                    case 0:
                        printf(".");
                        break;
                    case 1:
                        printf(":");
                        break;
                    case 2:
                        printf("c");
                        break;
                    case 3:
                        printf("o");
                        break;
                    case 4:
                        printf("C");
                        break;
                    case 5:
                        printf("O");
                        break;
                    case 6:
                        printf("8");
                        break;
                    case 7:
                        printf("@");
                        break;
                }
            }
        printf("\n");
        }
    }
}