练习n的阶乘

//练习n的阶乘
#include<stdio.h>
int main()
{
           int n = 0;
          scanf( "%d", &n);
           int sum = 1;
           for (int i = 1; i <= n; i++)
          {
                   sum *= i;
          }
          printf( "%d\n", sum);
          system( "pause");
           return 0;
}