#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; |
} |