#include <iostream>
#include <cmath>
 
using namespace std;
 
double pole(double a, double b, int n) {
    double h = (b - a) / n;
    double suma = 0.0;
 
    for (int i = 0; i < n; i++) {
        double x_srodek = a + (i + 0.5) * h;
        suma += sin(x_srodek);
    }
 
    return suma * h;
}
 
int main() {
    double a = 0.0;
    double b = 3.14;
 
    int n1 = 10;
    int n2 = 100;
 
    cout << "Pole dla n = 10:  " << pole(a, b, n1) << endl;
    cout << "Pole dla n = 100: " << pole(a, b, n2) << endl;
 
    return 0;
}
 

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