
#include<iostream>
using namespace std;
void main()
{
float sum=0;
float t=1.0,x,i=1,n=1.0,N,j=1;
cout<<"请输入一个X的值"<<endl;
cin>>x;
cout<<"输入一个N"<<endl;
cin>>N;
while(i<=N)
{
sum=sum+t;
j=j*x;
t=j/n;
i++;
n=n*i;
}
cout<<"前"<<N<<"项和为:"<<sum;
}


