Weird Function Calling

[TKM]

I have a function defined and called by main program as follows:

defined: int function_name (int)

Called upon: (int (*)(int)) function_name

Could anyone shed some light regarding the above? The program could be compiled and executed.

[weaknessforcats]

Yes, it is weird.

This is a typecast:

(int (*)(int)) function_name
 

just like

(int*)data
 

So, function_name is the name of a function. As such, the function name is also the address of the function. In this case, function_name is the address of a function that takes an int argument and returns an int.

The typecast is casting function_name as the address of a function that takes an int argument and returns an int.

The weird part is that it already is that kind of address.

I suspect you can remove (int (*)(int)) function_name from your code and things will still work.

[JonLT]

It's a function pointer

(int (*)(int))

means a pointer to a function that returns an int and takes an int as an argument.

EDIT: isn't it?