【C语言】求n的阶乘

// n的阶乘 
#include <stdio.h>

int main() {
    int fac(int n);
    int n; 
    printf("请输入n以求n的阶乘：");
    scanf("%d", &n);
    printf("%d!=%d", n, fac(n));
    return 0;
}

int fac(int n) {
    if (n>=2) {
        return fac(n-1) * n;
    } else {
        return 1;
    }
}