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Possible Duplicate:
What is the point of function pointers?
I just read about pointers to function in K+R. I understand how these pointers work, but I don’t see the utility for they. What’s the use for this type of pointers in programming?
You can use function pointers for a variety of tasks such as registering factories, applying an algorithm on a data structure (e.g. sorting a list using a user-defined sort function). There are a few other uses but essentially you need them for inversion of control: let someone else call back into your code, and you do this by providing a pointer to the function.