用C语言编程求1!+2!+.......+n!

# include "iostream.h" int Fun(int n){ int sum=1,i=1,SUM=0; for(i=1;i<=n;i++){ sum*=i; SUM+=sum; } return SUM; } void main(){ int n; cout<<"你要计算1的阶层加到n的阶层，请输入n\nn: "; cin>>n; cou