递归方法求阶乘

# include <stdio.h>

int fac(int n)
{
int result = 0;
if (n < 0)
{
printf("输入错误");
return 0;
}
else if (n == 0 || n == 1)
{
result = 1;
}
else
{
result = fac(n - 1)*n;
}
return result;
}

int main()
{
int n = 5;
printf("%d的阶乘=%d\n",n,fac(n));
return 0;
}