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#include <stdio.h>
#include <stdlib.h>

/* static bits default to zero, so we get seven flip-flops */
int main(void) {
    static char a, b, c, d, e, f, g;

start:
    puts("Hello World!");

    /* increment binary counter in bits a…g */
    a = !a;
    if (!a) {
        b = !b;
        if (!b) {
            c = !c;
            if (!c) {
                d = !d;
                if (!d) {
                    e = !e;
                    if (!e) {
                        f = !f;
                        if (!f) {
                            g = !g;
                        }
                    }
                }
            }
        }
    }

    /* when bits form 1100100₂ (one-hundred), exit */
    if (g && f && !e && !d &&  c && !b && !a)
        exit(EXIT_SUCCESS);

    goto start;
}