README.md

Reverse Polish Notation (RPN) and Shunting Yard Algorithm

• Accept 15_07_rpn_shunting_yard
• Get basic_test.cpp

---

Implement Reverse Polish Notation (RPN)

#ifndef RPN_H
#define RPN_H

#include <iostream>

#include "../queue/MyQueue.h"
#include "../stack/MyStack.h"
#include "../token/token.h"
#include "../token/function.h"
#include "../token/integer.h"
#include "../token/operator.h"
#include "../token/leftparen.h"
#include "../token/rightparen.h"

using namespace std;

class RPN
{
public:
  // CTOR
  RPN();
  RPN(const Queue<Token*>& input_q);
  
  // save input_q to member variable queue
  void set_input(const Queue<Token *> &input_q);

  // return result from member variable queue
  double operator()(double value = 0);
  // called by operator ()
  double rpn(double value = 0);

private:
  Queue<Token*> queue;
};

#endif //RPN_H

Implement Shunting Yard Algorithm

#ifndef SHUNTING_YARD_H
#define SHUNTING_YARD_H

#include <iostream>
#include <cassert>

#include "../queue/MyQueue.h"
#include "../stack/MyStack.h"
#include "../token/token.h"
#include "../token/function.h"
#include "../token/integer.h"
#include "../token/operator.h"
#include "../token/leftparen.h"
#include "../token/rightparen.h"

using namespace std;

class ShuntingYard
{
public:
  // CTOR
  ShuntingYard();
  ShuntingYard(const Queue<Token*>& input_q);

  // save input_q to member variable queue
  void infix(const Queue<Token*>& input_q);
  
  // generate postfix queue from infix queue
  Queue<Token*> postfix();
  Queue<Token*> postfix(const Queue<Token*>& input_q);
  // called by postfix() 
  Queue<Token*> shunting_yard();
private:
  Queue<Token*> queue;
};

#endif //SHUNTING_YARD_H

"includes/token/constants.h" file:

#ifndef CONSTANTS_H
#define CONSTANTS_H

enum TOKEN_TYPES
{
  FUNCTION,
  INTEGER,
  OPERATOR,
  LPAREN,
  RPAREN,
  TOKEN
};

#endif //CONSTANTS_H

Part of token.cpp for printing out tokens

#include "token.h"

Token::Token() {}

void Token::Print(ostream &outs) const
{
  outs << "TOKEN Print: DON't ^%#$# call me again!" << endl;
}

ostream& operator <<(ostream& outs, const Token* token)
{
  token->Print(outs);
  return outs;
}

ostream &operator<<(ostream &outs, const Token &token)
{
  token.Print(outs);
  return outs;
}