main.cpp

栈的应用—Polish Calculator

#include<iostream.h>
#include"PolishCal.h" 

void main()
/*
Post: The program has executed simple arithmetic
      commands entered by the user.
Uses: The class Stack and the functions
      introduction, instructions, do_command, and get_command.
*/

{
   MyStack stored_numbers;
   void introduction();
   void instructions();
   
   introduction();
   instructions();
   while (do_command(get_command(), stored_numbers));
}

void introduction()
{
   cout<<"This is a reverse Polish Calculator."<<endl;
}

void instructions()
{
   cout << "Please enter a valid command:"   << endl
		<< "[?]push to stack   [=]print top" << endl
        << "[+] [-] [*] [/]   are arithmetic operations" << endl
        << "[Q]uit." << endl;
}