zadanie 4

#include <iostream>
#include <math.h>
using namespace std;
char a;
float b, c;
int main()
{

cout << "wprowadz litere pole prostakata(a), pole kwadratu(b), pole trojkata(c), pole kola(d): " << endl;
cin >> a;
switch(a){
case 'a':
    cout << "wprowadz dwa boki prostakata: " << endl;
    cin>>b>>c;
    cout << "pole prostakata: " << b*c << endl;
     break;
case 'b':
    cout << "wprowadz bok kwadratu: " << endl;
    cin>>b;
    cout << "pole kwadratu: " << b*b << endl;
     break;
case 'c':
    cout << "wprowadz dlugosc podstawy trojkata: " << endl;
    cin>>b;
    cout << "wprowadz wysokosc trojkata: " << endl;
    cin>>c;
    cout << "pole trojkata: " << b*c/2 << endl;
     break;
case 'd':
    cout << "wprowadz promien kola: " << endl;
    cin>>b;
    cout << "pole kola: " << M_PI*b*b << endl;
     break;
default: cout << "zly znak" << endl; break;
}
}