int main() { int y; for (y = 2008; y <= 2121; y++) { if (wday(y, 12, 25) == 0) printf("%04d-12-25\n", y); } return 0; }
int main(int argc, char const* argv[]) { int count = 0; int y, m; for (y = 1901; y <= 2000; y++) { for (m = 0; m < 12; m++) { if (!wday(y, m, 1)) { count++; } } } printf("%d\n", count); return 0; }