Q158039: STL Sample for the stack::size Function

Article: Q158039
Product(s): Microsoft C Compiler
Version(s): 4.2,5.0,6.0
Operating System(s): 
Keyword(s): kbcode kbVC420 kbVC500 kbVC600 kbDSupport
Last Modified: 17-APR-2002

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The information in this article applies to:

- The Standard C++ Library, used with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, versions 4.2, 5.0, 6.0 
   - Microsoft Visual C++, 32-bit Professional Edition, versions 4.2, 5.0, 6.0 
   - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
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SUMMARY
=======

The sample code below illustrates how to use the stack::size STL function in
Visual C++.

MORE INFORMATION
================

Required Header
---------------

     <stack>

Prototype
---------

     template<class _TYPE, class _C, class _A>
     size_type stack::size() const;

NOTE: The class/parameter names in the prototype may not match the version in the
header file. Some have been modified to improve readability.

Description
-----------

The stack::size function returns the number of elements in the stack. It is okay
to call this function with an empty stack; it will return a value of 0.

Sample Code
-----------

  ////////////////////////////////////////////////////////////////////// 
  // 
  // Compile options needed: /GX
  // 
  // StackSize.cpp : Illustrates how to use the size function to determine
  //                 the number of elements on the stack.
  // 
  // Functions:
  // 
  //    size :  returns the number of elements in the stack.
  // 
  // Written by Derek Jamison
  // of Microsoft Product Support Services,
  // Copyright (c) 1996 Microsoft Corporation. All rights reserved.
  ////////////////////////////////////////////////////////////////////// 

  #pragma warning(disable:4786)

  #include <stack>
  #include <string>
  #include <iostream>
  using namespace std;

   #if _MSC_VER > 1020   // if VC++ version is > 4.2
     using namespace std;  // std c++ libs implemented in std
     #endif

  typedef stack<string, deque<string, allocator<string> >,

                allocator<string> > STACK_STRING;

  void main()

  {

     STACK_STRING stack1;

     // Check the size of an empty stack. Should return 0.
     cout << "stack1.size() equals " << stack1.size() << endl;

     // Add item "Hello" to Stack1.
     cout << "stack1.push('Hello')" << endl;
     stack1.push("Hello");

     // Add item "This is the second element" to Stack1.
     cout << "stack1.push('This is the second element')" << endl;
     stack1.push("This is the second element");

     // Check the size of Stack1. Should return 2.
     cout << "stack1.size() equals " << stack1.size() << endl << endl;

     // Add item "Third element" to Stack1.
     cout << "stack1.push('Third element')" << endl;
     stack1.push("Third element");

     // Check the size of Stack1. Should return 3.
     cout << "stack1.size() equals " << stack1.size() << endl << endl;

     // Pop "Third element".
     cout << "stack1.pop()" << endl;
     stack1.pop();

     // Pop "This is the second element".
     cout << "stack1.pop()" << endl;
     stack1.pop();

     // Check the size of Stack1 again. Should return 1.
     cout << "stack1.size() equals " << stack1.size()  << endl << endl;

     // Pop "Hello".
     cout << "stack1.pop()" << endl;
     stack1.pop();

     // Check the size of Stack1. Should return 0.
     cout << "stack1.size() equals " << stack1.size() << endl << endl;

  }

Program Output is:

stack1.size() equals 0

stack1.push('Hello')
stack1.push('This is the second element')
stack1.size() equals 2

stack1.push('Third element')
stack1.size() equals 3

stack1.pop()
stack1.pop()
stack1.size() equals 1

stack1.pop()
stack1.size() equals 0

REFERENCES
==========

Visual C++ Books On Line: Visual C++ Books:C/C++:Standard C++ Library Reference.

Additional query words: STL STLSample size

======================================================================
Keywords          : kbcode kbVC420 kbVC500 kbVC600 kbDSupport 
Technology        : kbVCsearch kbAudDeveloper kbVCLibrary
Version           : :4.2,5.0,6.0
Issue type        : kbinfo

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