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#include <iostream>
#include <iomanip>

using namespace std;

int main()
{	
	//1. variable declaration
	float width, height, area;
	
	cout << fixed << showpoint << setprecision(3);

	//input
	cout << "Input the width (-1 to quit) : ";
	cin >> width;
 	
	while(width > 0)
	{
		cout << "input the height: ";
		cin >> height;
	
		//computin
		area = width * height;

		//out
		cout << "the area is: " <<area << "\n";

		cout << "Input the width (-1 to quit) : ";
        	cin >> width;		
}
	return 0;
}