我把它改成了double，因为这看起来更像你的应用程序，但是你必须有很多i，需要一个if块，而不是一个for循环。希望这有帮助

#include<iostream>
#include<cmath>

using namespace std;

double u, h, s = {};

int main()
{
    int ar_size;
    cout << "Enter array size" << endl;
    cin >> ar_size;
    double* a = new double[ar_size];
    cin.clear();
    cin.ignore();
    
    for (int i = 0; i < ar_size; i++)
    {
        cout << "Enter array data" << endl;
        string input;
        getline(cin, input);
        a[i] = stod(input);
        cout << "Value of " << i << " element is " << a[i] << endl;
            if(a[i] > 0 && a[i] < 3.14)
            {
                u = 2 * cos(a[i]);
                h = 1 - 2 * sin(a[i]);
                s = s + u / h;
                cout << "When i = " << a[i] << "\t" << "s = " << s << endl;
            }
            else
            {
                cout << "out of bounds\n";
            }
    }
}