HCL Interview questions

HCL Interview questions C++
 1) First asked me to write a Sudo code/Design to a Multi threaded gateway program
 2)Another program/Design for a game from login to player may opt for Multiplayer/ single play game type sudo code?
3)Explain Dynamic binding Wire simple example code?
4)Write Virtual destructor code ?explain why its useful?
5)Which are the design paterns you know explain? also asked why Facade,observer pattern useful apart from other?

 By Navaneet ,Hyderabad
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