// Zeinalipour-Yazti Demetrios
// csyiazti
// cs10xx -
// Lab Sec#24
// lab4
	/*
	 *	This program allows the user to calculate the area of a rectangle many times.
	 *	A) Input: length, width, continue/quit
	 *	B) Restrictions: inputs must be positive
	 *	C) Output: area
	 *	D) Formula: area = length * width
     *
	 */
#include <iostream.h>

void main()
{
	int length;					/* The length of the square                     */
	int width;					/* The width  of the square                     */
	int area;					/* The area of the square                       */
	bool quit  = false;			/* Should the program stop executing            */
	char quitquestion;			/* Field to store users answer on quit question */
	bool correctinput = false;  /* Has the user entered a correct input         */

	/* */
	while (!quit)  //start while1
	{

		  /*  Getting the length */
		  while (true) //start while1a
		  {
			  cout << "\nPlease type in the (positive) \"length\" of the square: ";
			  cin >> length;
			  if (length>0)
				{ break; }
			  else
			  	{ cout << "Error# - The value you entered is not a positive integer: " << endl; }
		  }	//end while1a


		  /*  Getting the width */
		  while (true)
		  {
			  cout << "Please type in the (positive) \"width\" of the square: ";
			  cin >> width;
			  if (width>0)
				{ break; }
			  else
			  	{ cout << "Error# - The value you entered is not a positive integer!\n\n"; }
		  }//end while1b


		  /* Calculating the square of the given values */
		  area = length*width;


		  /* Printing out the result */
		  cout << "The area of the square ("
	 		   << length << "x" << width << ") = "
			   << area << endl << endl << endl;


		  /*  Asking if the user want to execute again */
		  while (!correctinput)
		  {
			  cout << "Do you want to do the calculation again? (y/n): ";
			  cin >> quitquestion;
			  switch (quitquestion)
			  { case 'y' : correctinput = true;
						   break;
				case 'n' : quit = true;
						   correctinput = true;
						   break;
				default: cout << "Error# - Please use \"y\" for yes OR \"n\" for no!\n\n";
			  }
		  }//end while1b
  		  correctinput = false; /* Setting the variable to false again - reuse it*/


	} // end while1
}