C Programming

POINTERS TO FUNCTIONS
A pointer can also be declared as pointing to a function. The declaration of such a pointer is done by,


	int  (*func_pointer)();

The parentheses around *func_pointer are necessary, else the compiler will treat the declaration as a declaration of a function. To assign the address of a function to the pointer, the statement,


	func_pointer = lookup;

where lookup is the function name, is sufficient. In the case where no arguments are passed to lookup, the call is


	(*func_pointer)();

The parentheses are needed to avoid an error. If the function lookup returned a value, the function call then becomes,


	i = (*func_pointer)();

If the function accepted arguments, the call then becomes,


	i = (*func_pointer)( argument1, argument2, argumentn);