Casting (con’td)

Compile-time Errors:

• Those that are discernable  without the program executing.

• Question of language legality: “Is this a legal statement?” e.g.,

iIndex = chVariable; Statement is not legal.

Run-time Errors:

• Those that are discernable only when the program is running with actual data values.

• Question of execution legality:

“Is it legal for this variable to have the actual value assigned to it?”, e.g., 

animalArray[<badIndex>] = someAnimal

Statement is legal, but particular  index value isn’t.

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