阶乘累加

阶乘累加

#include<stdio.h>int fact_and_sum(int n);int main(){int x;scanf("%d",&x);printf("%d\n",fact_and_sum(x));return 0; }  int fact_and_sum(int n) { int i,j,fact,sum=0; for(i=1;i<=n;i++) { fact=1; for(j=1;j<=i;j++)//球i！   fact*=j;sum+=fact; }return sum; }