一到n阶乘之和

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