The difference between a pointer function and a function pointer

"-" Turn from: http://www.cnblogs.com/gmh915/archive/2010/06/11/1756067.html

The use of the second function pointer:

Form 1: Return type (* function name) (parameter table)

 1  char  (*pfun) (int  );  2  char  glfun (int  a) {return   3  void   main ()  4  5    pfun = Glfun;  6  (*pfun) (2  );  7 } 

The first line defines a pointer variable pfun. First we recognize that it is a pointer to a function, according to the "Form 1" mentioned earlier, which is an int and the return value is a char type. Only the first sentence we can not use this pointer, because we have not yet assigned to it.
The second line defines a function glfun (). The function is exactly a function that returns char as an int parameter. We are going to understand the function from the level of the pointer-the function name of the function is actually a pointer, and the function name points to the first address of the function's code in memory
Then there is the main () function, and the first sentence you should understand-it assigns the address of the function Glfun to the variable pfun. The "*pfun" in the second sentence of the main () function is clearly the content of the address pointed to by Pfun, and of course the contents of the function Glfun () are taken out, and the given parameter is 2.

The difference between a pointer function and a function pointer