Design Questions

Design a class library for writing card games. Design an elevator control system. Buttons are present on every floor and supporting multiple elevators. (What objects/methods/properties/how components communicate) How would you design the infrastructure front half of a very large web ecommerce site? what if it was very personalized? (how sessions are handled? where and what you can cache? how to load-balance?) Design a chess game Design malloc() and free(). http://g.oswego.edu/dl/html/malloc.html