C language - Difference between Funtion to pointer and pointer to function

[GEEK]

Difference between Funtion to pointer and pointer to function

[Priyakk]

There is no such concept as FUNCTION TO POINTER.

We have POINTER TO FUNCTION.

A pointer to a func is usually used to call that that function.

Here there requires 3 steps.

1) Declare a pointer to the func which has the same signature as the func.

eg) int calculate(int); // function

int (*p)(int); // pointer to the above func

2) Assign the address of the function to the func pointer.

The name of the func is itself the address of the function.

p = calculate;

By this we mean to say that P is a func pointer to the func "calculate".

3) To call the func using the function pointer....we use

(*p)(5); // calls the calculate func.

By (*p) ------> we mean the function "calculate".

By passing 5 -----> we are passing an int value as an argument to this func "calculate".

hence (*p)(5) means calculate(5).

I hope this makes the concept clear...