阶乘-n！_C语言实现

n!

// Code file created by C Code Develop

#include "stdio.h"
#include "stdlib.h"

int main(){
    int fac(int c);
    printf("%d", fac(- 4));

    return 0;
}

int fac(int n) {
    if(n < 0) return EOF;
    if(n == 0 || n == 1) return 1;

    return n*fac(n - 1);
}