for循环被跳过c ++

Question

我必须找到几何级数1/3 + 1/9 + 1/27 .....的总和,我必须用setprecision 6输出总和.

这是我的代码:

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
    int n;
    int x = 1;
    float sum = 0;
    cin >> n;
    for (int i = 1; i <= n; i++){
        x *= 3;
        sum += (float)(1/x);
    }
    cout << fixed << setprecision(6);
    cout << "Sum of the geometric progression of the first " << n << " elements is " << sum << endl;
    return 0;
}

程序始终输出0.000000,当我尝试在for循环中添加测试cout时,程序崩溃.

Answer 1

(1/x)因为两个参数都是0,所以总是0 int.例如,请使用(1.0 / x).