帮帮忙吧，这道题怎么做呀？

Question

Answer 1

#include <stdio.h>
double fact(int n)
{
    if (n == 0 || n == 1)
        return 1;
    else if (n > 1)
        return n * fact(n - 1);
}
int main(void)
{
    int n = 0;
    printf("输入一个正整数:");
    scanf("%d", &n);
    printf("%d的阶乘为:%.0lf\n", n, fact(n));
    return 0;
}

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