#include<stdio.h>
#include<iostream>
using namespace std;


int main()
{
      float a,b,r,p,o;
      int s;

      cout << "1-kwadrat\n2-prostokat\n3-kolo\n";
      scanf("%d",&s);

      switch (s)
{
/*kwadrat*/

      case 1:
           cout << "Podaj dl.boku";
           scanf ("%f",&a);
           if (a<=0) cout << "zle dane!";
           else
            { p=a*a;
              o=4*a;
              cout << "pole= " << p << "\nobwod= " << o;
              }
          break;

/*prostokat*/

      case 2:
           cout << "Podaj dl.pierwszego boku";
           scanf ("%f",&a);
           cout << "Podaj dl.drugiego boku";
           scanf ("%f",&b);
           if ((a<=0)||(b<=0)) cout << "zly wybor";
           else
            {  p=a*b;
               o=2*(a+b);
               cout << "pole= " << p << "\nobwod=" << o;
               }
          break;

/*kolo*/

      case 3:
           cout << "Podaj promien";
           scanf ("%f",&r);

           if (r<=0) cout << "zly wybor";
           else
            {
               p=3.14*r*r;
               o=2*3.14*r;
               cout << "pole= " << p << "\nobwod=" << o;
               }
          break;


 default:
         cout << "jestes glupi,tego nie ma w menu o_0 ";

         break;
         }

         system("pause");
         return 0;

         }