Recursive macros

//
//  Factorial.h
//  Sort
//
//  Created by me on 1/15/13.
//  Copyright (c) 2013 me. All rights reserved.
//

#ifndef Sort_Factorial_h
#define Sort_Factorial_h

#define FACTORIAL(__TYPE__, n) _factorial_##__TYPE__(n)

#define CREATE_FACTORIAL_FUNC_WITH_TYPE(__TYPE__) \
    static inline __TYPE__ _factorial_##__TYPE__(__TYPE__ n) { \
            return ((((n) == 0))?1:((n) * FACTORIAL(__TYPE__, ((n) - 1)))); \
    }

#endif

//
//  main.c
//  Sort
//
//  Created by me on 1/14/13.
//  Copyright (c) 2013 me. All rights reserved.
//

#include <stdio.h>

#include "Factorial.h"

CREATE_FACTORIAL_FUNC_WITH_TYPE(long);

int main(int argc, const char * argv[]) {
    long result = FACTORIAL(long, 5);
    printf("%ld\n", result);

    return 0;
}