#includeThis code creates an empty stack of integers (`my_stack`) and pushes three elements onto it. It then prints the top element of the stack (`3`), removes the top element, prints the new top element (`2`), and returns 0, indicating successful execution. The `push()` function is used to insert elements onto the top of the stack. The `pop()` function is used to remove the top element. The `top()` function returns a reference to the top element of the stack. If the stack is empty, calling `top()` results in undefined behavior. The `#include int main() { std::stack my_stack; my_stack.push(1); my_stack.push(2); my_stack.push(3); std::cout << "The top element is: " << my_stack.top() << std::endl; my_stack.pop(); std::cout << "The top element is now: " << my_stack.top() << std::endl; return 0; }