Chapter 16. Exceptional Circumstances: Error Handling
Programmers in any language endeavor to write bug-free programs, programs that never crash, programs that can handle any situation with grace and that can recover from unusual situations without causing the user any undue stress. Good intentions aside, programs like this don't exist.
In real programs, errors occur either because the programmer didn't anticipate every situation your code would get into (or didn't have the time to test the program enough), or because of situations out of the programmer's control—bad data from users, corrupt files that don't have the right data in them, network connections that don't connect, hardware devices that don't respond, sun spots, gremlins, whatever.
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