#include <iostream>
#include <cstdlib>
#define _USE_MATH_DEFINES
#include <math.h>
using namespace std;

int main()
{
	setlocale (0, "Russian");
	/*7*/	float r, h; //Çàäàåì ïåðåìåííûå
	bool bContinue = true;
    while(bContinue)
    	{
	cout << "Ââåäèòå ðàäèóñ îñíîâàíèÿ öèëèíäðà: ";
	if (!(cin >> r) || cin.get() != '\n')
	{
		cin.clear();
		cin.sync();
		cout <<"Íåäîïóñòèìîå çíà÷åíèå ïåðåìåííîé\n";
	}
	else
	if (r < 0)
		cout <<"Çíà÷åíèå ïåðåìåííîé ìåíüøå 0\n";
	cout << "Ââåäèòå âûñîòó öèëèíäðà: "; //Àíàëîã Writeln
	cin >> h; //Àíàëîã Readln
    /*24*/	int s = 2*M_PI*r*r+2*M_PI*r*h; //Ðàññ÷åò
	cout << "Ïëîùàäü ïîâåðõíîñòè öèëèíäðà = " << s << endl; // Âûâîä îòâåòà.
return 0;

}