A spinning doughnut made in C.

doughnut.c

//A spinning doughnut made in C.
//Found that on a Youtube vid, very cool though.

#include <stdio.h>
#include <math.h>
#include <string.h>

int main()
{
    int k;
    float A = 0.0, B = 0.0, i, j, z[1760];
    char b[1760];
    printf("\x1b[2J");
    for (;;) {
        memset(b, 32, 1760);
        memset(z, 0, 7040);
        for (j = 0.0; 6.28 > j; j += 0.07) for (i = 0.0; 6.28 > i; i += 0.02) {
            float c = sin(i), d = cos(j), e = sin(A), f = sin(j), g = cos(A), h = d + 2, D = 1 / (c * h * e + f * g + 5), l = cos(i), m = cos(B), n = sin(B), t = c * h * g - f * e;
            int x = 40 + 30 * D * (l * h * m - t * n), y = 12 + 15 * D * (l * h * n + t * m), o = x + 80 * y, N = 8 * ((f * e - c * d * g) * m - c * d * e - f * g - l * d * n);
            if (22 > y && y > 0 && x > 0 && 80 > x && D > z[o]) {
                z[o] = D;
                b[o] = ".,-~:;=?*#$@"[N > 0 ? N : 0];
            }
        }
        printf("\x1b[H");
        for (k = 0; 1761 > k; k++)
            putchar(k % 80 ? b[k] : 10);

        A += 0.04;
        B += 0.02;
    }
    
    return 0;
}