Functions

• Is a object.
• It is like an array in that it can't be an lvalue.
• You can't even reference any of the elements.

• Syntax:

      type (*name)(argument declaration);
  

• The argument declaration is optional like with declaring functions.
• The type is the return type of the function.
• The type defaults to int.
• Gotchas!

      char (*func)();    /* Declaration of func a pointer to a function that returns a char */
      char *func();      /* Definition of a function that returns a pointer to char */
  

• Setting is simple.

      extern int * foo(int);
      int * (*ptr_to_foo)(int);
  
      ptr_to_foo = foo;
  

• Indirecting through is different from all other pointers.
• Indirecting looks just like calling a function.

      while (10 == ptr_to_foo(5));