queue

#include <iostream> 
#include <queue> 

using namespace std; 
 
int main() 
{ 
    // Declare a queue of char 
    queue<char> keyQueue; 
 
    // Loop until the user presses ESC 
    while (true) 
    { 
        // Check if a key has been pressed 
        if (kbhit()) 
        { 
            // Read the key and add it to the queue 
            char key = getch(); 
            keyQueue.push(key); 
 
            // If the key is ESC, break the loop 
            if (key == 27) 
                break; 
        } 
 
        // Check if the queue is not empty 
        if (!keyQueue.empty()) 
        { 
            // Get the first element of the queue 
            char key = keyQueue.front(); 
 
            // Process the key 
            cout << "You pressed: " << key << endl; 
 
            // Remove the key from the queue 
            keyQueue.pop(); 
        } 
    } 
 
    return 0; 
}