stack::size() function in C++ STL

In C++, the standard library gives us the facility to use the Stacks as a type of container adaptors with LIFO type of working. The stack::size() is a C++ Standard Library function which is used to get the number of elements in the stack.

Syntax:

Stack_Name.size( );

Parameter: The stack::size() function does not accepts any parameter.

Return value: The stack::size() function returns the number of elements in the stack container.

Example of stack::size() Function

Program

#include <iostream>

#include <stack>

using  namespace std;

int  main()

{

stack<int> STK;

STK.push(10);

STK.push(20);

STK.push(30);

cout << STK.size()  << endl;

while  (!STK.empty())

{

STK.pop();

cout << STK.size()  << endl;

}

}

Output

3

2

1

0