编辑代码

#include<stdio.h>
int main()
{
    int n = 0;
    int i = 1;
    int m = 1;

    int sum = 0;
    scanf("%d",&n);
            for(i = 1; i <= n ; i++)
            {
                m = m * i;      //n!
                sum = sum + m;
            }
    printf("n！= %d\n",m);
    printf("sum = %d\n",sum);
    return 0;
}