1!+2!+3!+4!............n!的和

//1!+2!+3!+4!............n!的和

#include <iostream.h>

#include<stdio.h>

int Factorial(int n)

{

int result;

if((n==1)||(n==0))

result=1;

else

result=Factorial(n-1)*n;

return result;

}

void main()

{

int n,i,sum=0;

cout<<"请输入n值: ";

cin>>n;

for(i=1;i<=n;i++)

sum=sum+Factorial(i);

cout<<"所求结果为: "<<sum<<endl;

}