#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    
float shoa;
float ghaede;
float ertefa;
float masahat;

int entekhab;

cout <<"***********Menu************\n";
cout <<"1-dayereh\n";
cout <<"2-mosalas\n";
cout <<"***************************\n";

cin >> entekhab;

if(entekhab ==1)
{
   cout<< "\n shoa ra vared konid: \n";
   cin >> shoa;
   masahat = shoa * 3.14;
   cout<< "\n Masahat dayereh: " << masahat;     
}
else if(entekhab ==2)
{
   cout<< "\n ertefa ra vared konid: \n";
   cin >> ertefa;
   cout<< "\n Ghaede ra vared konid: \n";
   cin >> ghaede;
   masahat = ghaede * ertefa /2;
   cout<< "\n Masahat dayereh: " << masahat; 
     
}
else
{
   cout <<"Moshkeli pish amade!!!";    
}
    
    system("PAUSE");
    return EXIT_SUCCESS;
}