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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_stack_push_copy.htm below:

C++ Stack Push Copy

The C++ function std::stack::push() inserts new element at the top of the stack and increases size of stack by one.

Following is the declaration for std::stack::push() function form std::stack header.

void push (const value_type& val);

void push (const value_type& val);

val − Value to be assigned to the newly inserted element.

None.

Depends upon underlying container.

Constant i.e. O(1)

The following example shows the usage of std::stack::push() function.

#include <iostream>
#include <stack>

using namespace std;

int main(void) {
   stack<int> s;

   for (int i = 0; i < 5; ++i)
      s.push(i + 1);

   cout << "Stack contents are" << endl;

   while (!s.empty()) {
      cout << s.top() << endl;
      s.pop();
   }

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Stack contents are
5
4
3
2
1

stack.htm

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