Zadanie switch 4

#include <iostream>
using namespace std;
int main()
{
    char x;
    int a, b;
    int pole = 0;
    cout << "Podaj litere a,b,c lub d" << endl;
    cin >> x;

    switch (x)
    {
    case 'a':
        cout << "Podaj dlugosc pierwszego boku" << endl;
        cin >> a;
        cout << "Podaj dlugosc drugiego boku" << endl;
        cin >> b;
        pole = a * b;
        cout << "Pole prostokata wynosi : " << pole << endl;
        break;
    case 'b':
        cout << "Podaj dlugosc boku" << endl;
        cin >> a;
        pole = a * a;
        cout << "Pole kwadratu wynosi : " << pole << endl;
        break;
    case 'c':
        cout << "Podaj dlugosc podstawy" << endl;
        cin >> a;
        cout << "Podaj dlugosc wysokosci" << endl;
        cin >> b;
        pole = 0.5 * a * b;
        cout << "Pole trojkata wynosi : " << pole << endl;
        break;
    case 'd':
        cout << "Podaj dlugosc promienia kola" << endl;
        cin >> a;
        pole = 3.14 * (a* a);
        cout << "Pole kola wynosi: " << pole << endl;
    default:
        cout << "Podano zla litere" << endl;
    }
}