C语言---循环迭代---n的阶乘

#include <stdio.h>
//求n的阶乘---循环迭代
int Fact(int n)
{
    int i = 0;
    int ret = 1;
    for (i = 1; i <= n; i++)
    {
        ret *= i;//就是ret = ret * i
    }
    return ret;
}
 
 
 
 
int main()
{
    int n = 0;
    scanf_s("%d", &n);
    int r = Fact(n);
    printf("%d", r);
 
    return 0;
}
在输入数据是要判断n是否小于0
if (n < 0)
{
    printf("Factorial is not defined for negative integers.\n");
}
else
{
    int ret = factorial(n);
    printf("%d的阶乘是%d\n", n, ret);
}