#ifndef EXPRESSION_H_
#define EXPRESSION_H_
#include <iostream>
#include"string"
#include "Stack.h"
#include "Queue.h"

using namespace std;

class Expression {
public:
	Expression();
	int isp(char ch);
	int icp(char ch);
    void infix_to_postfix(string infix);
	bool is_digit(char ch);
	double calculate_postfix();
	void dispose_operator( char chRead );
private:
	string postfix;
	Stack<double>theStack;
};
#endif