STL Sample for the stack::operator== FunctionLast reviewed: October 9, 1997Article ID: Q158037 |
The information in this article applies to:
SUMMARYThe sample code below illustrates how to use the stack::operator== STL function in Visual C++.
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Required Header
<stack> Prototype
template<class _TYPE, class _C, class _A> bool stack::bool operator==(const stack<_TYPE, _C, _A>& _X) 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.
DescriptionThe stack::operator== function returns true if both stacks have equal elements arranged in the same sequence. The stack::operator== function always returns false if the two stacks are of different size.
Sample Code
////////////////////////////////////////////////////////////////////// // // Compile options needed: /GX // // StackEqual.cpp : Illustrates how to use the stack::operator== // function to determine if two stacks are equal. // // Functions: // // operator== : Returns true if both stacks are the same. // // Written by Derek Jamison // of Microsoft Product Support Services, // Copyright (c) 1996 Microsoft Corporation. All rights reserved. //////////////////////////////////////////////////////////////////////#pragma warning(disable:4786) #include <stack> #include <iostream>typedef stack<double, deque<double, allocator<double> >, allocator<double> > STACK_DOUBLE; void main(){ STACK_DOUBLE stack1,stack2; // Add item 4.0 to Stack1. cout << "stack1.push(4.0) s1=[4.0]" << endl; stack1.push(4.0); // Add item 3.0 to Stack1. Current Stack1 contains items 3.0 (top) // 4.0 (bottom). cout << "stack1.push(3.0) s1=[3.0 4.0]" << endl; stack1.push(3.0); // Add item 4.0 to Stack2. cout << "stack2.push(4.0) s2=[4.0]" << endl; stack2.push(4.0); // Compare Stack1 and Stack2. Should return False. cout << "stack1==stack2 is " << ((stack1==stack2)? "True": "False") << endl << endl; // Add item 6.0 to Stack2. Current Stack2 contains items 6.0 (top) // 4.0 (bottom) cout << "stack2.push(6.0) s2=[6.0 4.0]" << endl; stack2.push(6.0); // Compare Stack1 and Stack2. Should return False. cout << "stack1==stack2 is " << ((stack1==stack2)? "True": "False") << endl << endl; // Keep adding item 8.0 to Stack2. Current Stack2 contains items // 8.0 (top), 6.0 and 4.0 (bottom). cout << "stack2.push(8.0) s2=[8.0 6.0 4.0]" << endl; stack2.push(8.0); // Compare Stack1 and Stack2. Should return False. cout << "stack1==stack2 is " << ((stack1==stack2)? "True": "False") << endl << endl; // Delete the top item from Stack2. Current Stack2 contains items // 6.0 (top) and 4.0 (bottom). cout << "stack2.pop() s2=[6.0 4.0]" << endl; stack2.pop(); // Delete another item from Stack2. Current Stack2 contains item 4.0. cout << "stack2.pop() s2=[4.0]" << endl; stack2.pop(); // Add item 3.0 to Stack2. Current Stack2 contains item 3.0 (top) and // 4.0 (bottom). cout << "stack2.push(3.0) s2=[3.0 4.0]" << endl; stack2.push(3.0); // Compare Stack2 and Stack2. Should return True. cout << "stack1==stack2 is " << ((stack1==stack2)? "True": "False") << endl << endl; // Delete the top item from Stack2. Current Stack2 contains 4.0. cout << "stack2.pop() s2=[4.0]" << endl; stack2.pop(); // Delete another item from Stack2. Stack2 should be empty. cout << "stack2.pop() s2=[]" << endl; stack2.pop(); // Push item 8.0 to Stack2. cout << "stack2.push(8.0) s2=[8.0]" << endl; stack2.push(8.0); // Compare Stack1 and Stack2. Should return False. cout << "stack1==stack2 is " << ((stack1==stack2)? "True": "False") << endl << endl;}
Program Outputstack1.push(4.0) s1=[4.0] stack1.push(3.0) s1=[3.0 4.0] stack2.push(4.0) s2=[4.0] stack1==stack2 is False stack2.push(6.0) s2=[6.0 4.0] stack1==stack2 is False stack2.push(8.0) s2=[8.0 6.0 4.0] stack1==stack2 is False
stack2.pop() s2=[6.0 4.0] stack2.pop() s2=[4.0]stack2.push(3.0) s2=[3.0 4.0] stack1==stack2 is True
stack2.pop() s2=[4.0] stack2.pop() s2=[]stack2.push(8.0) s2=[8.0] stack1==stack2 is False
REFERENCESVisual C++ Books On Line: Visual C++ Books:C/C++:Standard C++ Library Reference.
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Additional query words: STL STLSample operator==
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