116 lines
4 KiB
C++
116 lines
4 KiB
C++
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#include "stlexam.h"
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#pragma hdrstop
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/**************************************************************************
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*
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* calc.cpp - RPN Calculator -- Illustration of the use of stacks.
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* Section 10.2.1
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*
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***************************************************************************
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*
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* (c) Copyright 1994, 1998 Rogue Wave Software, Inc.
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* ALL RIGHTS RESERVED
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*
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* The software and information contained herein are proprietary to, and
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* comprise valuable trade secrets of, Rogue Wave Software, Inc., which
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* intends to preserve as trade secrets such software and information.
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* This software is furnished pursuant to a written license agreement and
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* may be used, copied, transmitted, and stored only in accordance with
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* the terms of such license and with the inclusion of the above copyright
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* notice. This software and information or any other copies thereof may
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* not be provided or otherwise made available to any other person.
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*
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* Notwithstanding any other lease or license that may pertain to, or
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* accompany the delivery of, this computer software and information, the
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* rights of the Government regarding its use, reproduction and disclosure
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* are as set forth in Section 52.227-19 of the FARS Computer
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* Software-Restricted Rights clause.
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*
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in
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* Technical Data and Computer Software clause at DFARS 252.227-7013.
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* Contractor/Manufacturer is Rogue Wave Software, Inc.,
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* P.O. Box 2328, Corvallis, Oregon 97339.
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*
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* This computer software and information is distributed with "restricted
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* rights." Use, duplication or disclosure is subject to restrictions as
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* set forth in NASA FAR SUP 18-52.227-79 (April 1985) "Commercial
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* Computer Software-Restricted Rights (April 1985)." If the Clause at
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* 18-52.227-74 "Rights in Data General" is specified in the contract,
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* then the "Alternate III" clause applies.
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*
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**************************************************************************/
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#include <vector>
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#include <stack>
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#ifdef _RW_STD_IOSTREAM
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#include <iostream>
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#else
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#include <iostream.h>
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#endif
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#ifndef _RWSTD_NO_NAMESPACE
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using namespace std;
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#endif
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//
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// Simulate the behavior of a simple integer calculator.
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//
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class CalculatorEngine
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{
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public:
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enum binaryOperator { PLUS, MINUS, TIMES, DIVIDE };
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int currentMemory () { return data.top(); }
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void pushOperand (int value) { data.push (value); }
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void doOperator (binaryOperator);
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protected:
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stack< int, vector<int,allocator<int> > > data;
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};
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void CalculatorEngine::doOperator (binaryOperator theOp)
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{
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int right = data.top();
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data.pop();
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int left = data.top();
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data.pop();
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switch (theOp)
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{
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case PLUS: data.push(left + right); break;
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case MINUS: data.push(left - right); break;
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case TIMES: data.push(left * right); break;
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case DIVIDE: data.push(left / right); break;
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}
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}
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int main()
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{
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cout << "Calculator example program, from Chapter 8" << endl;
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cout << "Enter a legal RPN expression, end with p q (print and quit)" << endl;
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int intval;
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CalculatorEngine calc;
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char c;
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while (cin >> c)
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switch (c)
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{
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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cin.putback(c);
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cin >> intval;
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calc.pushOperand(intval);
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break;
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case '+':
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calc.doOperator(CalculatorEngine::PLUS); break;
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case '-': calc.doOperator(CalculatorEngine::MINUS); break;
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case '*': calc.doOperator(CalculatorEngine::TIMES); break;
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case '/': calc.doOperator(CalculatorEngine::DIVIDE); break;
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case 'p': cout << calc.currentMemory() << endl;
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case 'q': cout << "End calculator program" << endl;
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return 0; // quit program
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}
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return 0;
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}
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