#includeIn this example, we create a queue of integers and add three elements to it using the `push` member function. We then print out the size of the queue using the `size` member function, which should be 3. This function is part of the C++ Standard Library, which is included in the standard C++ header files such as `#include int main() { std::queue myQueue; myQueue.push(1); myQueue.push(2); myQueue.push(3); std::cout << "Size of myQueue is: " << myQueue.size() << std::endl; return 0; }