// ExpressionDriver.cpp

// tom bailey   19 oct 05
// Modified to minimize code.
// Remove read prefix expressions, print postfix, evaluate.

// tom bailey   5 apr 04
// Modified to read prefix expressions.

// tom bailey   15 jan 04
// Modified to use Expression3.h.

// tom bailey   21 nov 03
// Exercise the print and evaluation methods of the Expression
//   class.

#include "Expression.h"

#include <iostream>
using std::cin;
using std::cout;
using std::endl;

int
main()
{
	while( true )
	{
		cout << endl;
		cout << "Enter a valid, marked, fully parenthesized (+,*) infix expression:" 
			<< endl;
		Expression & expr = readFPIE( cin );
		cout << endl;

		cout << "Prefix Expression: ";
		expr.preOrderPrint( cout );
		cout << endl << endl;
		cout << "  = " << expr.value();
		cout << endl << endl;

		delete & expr;
	}

	return 0;
}