function pointers---the difference between an int *f (4) and an int (*f) (4) in C + +

int *f (), which represents the function f, the type of the return value of the function is int *

Int (*f) (), which means that this is a function pointer, it can be useful to point to a function, point to a function can use it instead of the function, and then use this pointer is equivalent to using the function.

Routines

#include <stdio.h>int fun (int); int main (void) {    int (*F1) (int);    Int (*F2) (int);    F1 = fun;    F2 = &fun;//Note that the two methods of initializing function pointers above are correct, so you can choose to use & or not    F1 (2) When initializing a function pointer;    F2 (2);    return 0;} int fun (int i) {    printf ("%d", I);    return 1;}

function pointers---the difference between an int *f (4) and an int (*f) (4) in C + +