Q: I finally figured out the syntax for declaring pointers to functions, but now how do I initialize one?
A: Use something like
extern int func(); int (*fp)() = func;
When the name of a function appears in an expression, it ``decays'' into a pointer (that is, it has its address implicitly taken), much as an array name does.
A prior, explicit declaration for the function (perhaps in a header file) is normally needed, as shown. The implicit external function declaration that can occur when a function is called does not help when a function name's only use is for its value.
See also questions 1.25 and 4.12.
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