题目 1014: [编程入门]阶乘求和C语言

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#include<stdio.h>
#include<math.h>
#include<string.h>
long int fun(int n);
void main(){int n,i;long int Sn;Sn=0;scanf("%d",&n);for(i=1;i<=n;i++){Sn+=fun(i);}printf("%ld",Sn);}
long int fun(int i){long int sum=1;for(int j=1;j<=i;j++){sum*=j;}return sum;
}