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Of course it can notify of the problem with an error message in the log or some other mechanism.

To put it in a more abstract way, my approach is Other developers, among them some colleagues of mine, use another strategy. They assume that a piece of code should be given correct input and it should not be responsible for what happens if the input is wrong.

Also, if a NULL pointer exception crashes the program, a bug will be found more easily during testing and have more chances of being fixed.

My answer to this is normally: but what if the bug is not found during testing and appears when the product is already being used by the customer?

My typical block or method looks like this: Also, during the computation, I check all pointers before dereferencing them.

My idea is that, if there is some bug and some NULL pointer should appear somewhere, my program should handle this nicely and simply refuse to continue the computation.

Compilers use Regular Expressions to validate the syntax of programs.If the value of Success is false (i.e., there was no match) then display an error message and set the focus back to the first Name Text Box so that the user can retype the input and terminate the event handler.If there is a match then the event handler proceeds to validate the first name.Requiring the caller to validate arguments can result in faster code because the caller may understand certain invariants that prevent invalid values from being passed.Requiring the callee to validate arguments allows the validation code to be encapsulated in one location, reducing the size of the code and making it more likely that these checks are performed in a consistent and correct fashion.

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