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Sign on the professor’s door

Sign on the professor’s door | ProgrammerHumor.io
Sign on the professor’s door

[text] int DoorProtocol g KnockSharply cc AwaitAnswer Reply if cc timeout if Reply Enter returnEnterOffice else if Reply Wait cc AwaitHailHail if cc timeout returnComeBackLater if cc DoorOpen Hail ComeIn returnEnterOffice i else if Reply Busy DealWithRejection i returnComeBackLater