C++分数形式的求和

求键盘手带一带

代码如下：

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    int x;
    double e = 1.0e-4;
    double item = 1;
    double s = 0;
    double fz;
    double fm = 1;
    int i=1;
    cin >> x;
    item = x;
    fz = x;
    while(item > e)
    {
        s += item;
        fz = fz * x;
        i++;
        fm = fm*i;
        item = fz/fm;
    }
    cout <<fixed << setprecision(3) <<s;
    return 0;
}