OpenGL - Keyboard Function

/**

 * Call this function in the main entry point with

 * glutKeyboardFunc(keyboard);

 */

/**

 * x - mouse pointer position - zero to corner of window

 * y - mouse pointer position - zero to corner of window

 */

void keyboard(unsigned char key, int x, int y){
    switch(key){
        case 'a':
            cout << "You type a" << endl;
            break;
        case 'b':
            cout << "You type b" << endl;
            break;
    }
}

OpenGL - Keyboard Function