bool-operations.c: args: use (void) instead of ()

c-programming/experiments/bool-operations.c

@@ -15,7 +15,7 @@
                          BOOL_TO_STR(boolean),                                \
                          (uintmax_t) boolean)
 
-int main() {
+int main(void) {
 	bool boolean = false;
 	printf("Loop:\n");
 	for (uint8_t i = 0; i < 3; i++) {