std::stack::top

 

C++

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reference top();
const_reference top() const;

Returns reference to the top element in the stack. This is the most recently pushed element. This element will be removed on a call to pop(). Effectively calls c.back().

Parameters

(none)

Return value

reference to the last element

Complexity

Constant

See also

push	inserts element at the top (public member function)
pop	removes the top element (public member function)

Example

run this code

#include <stack>
#include <iostream>
 
int main()
{
    std::stack<int>   s;
 
    s.push( 2 );
    s.push( 6 );
    s.push( 51 );
 
    std::cout << s.size() << " elements on stack\n";
    std::cout << "Top element: "
	      << s.top()         // Leaves element on stack
	      << "\n";
    std::cout << s.size() << " elements on stack\n";
    s.pop();
    std::cout << s.size() << " elements on stack\n";
    std::cout << "Top element: " << s.top() << "\n";
 
    return 0;
}

Output:

3 elements on stack
Top element: 51
3 elements on stack
2 elements on stack
Top element: 6