Well, Exceptional programming case is one which deviates the program flow from normal stream and it might be due to:
::A h/w of s/w fault that programmer cannot handle in given situation. Programmer may be not sure what to do in those case and he left it to the user or tool/library which invokes this code.
::Even programmer might not be sure the exact environment in which his code will be used and hence it is better to leave the error handling to the one who uses the code.
So exceptional case with a program might be is to use it uncommon environment or with uncommon interactions.
Again uncommon interactions and unknown environments refers to the designers point of view.
So deviation from Normal is exceptional and again it is based on the point of view and context of the programmer.
Is it too round and round?:D
