(UINT16 *)&apple

[boki]

Dear All,
I knew "&apple" could get the address of apple variable, about why we use a
(UINT16 *) command before "&apple" ?

What is this function for?
Thank you very much for your help.

Best regards,

Boki.

[Gernot Frisch]

> I knew "&apple" could get the address of apple variable, about why

we use a
(UINT16 *) command before "&apple" ?

What is this function for?

It's a 'cast 'operator'. If Apple e.g. is of the type 'INT16', but
your function requires a UINT16*, you must cast it to that type. Be
sure you know what you do, since this:

double a=5;

*((int*)&a) = 5;
printf("%d", a);

will result in a funny number. The memory used for 'a' will be cast so
the compiler thinks it really _is_ an int that you are pointing to.
Assinging the first 4 bytes of a double with 0x00000005 will result in
anything else than '5.0'.
-Gernot

[boki]

Wow, it is really useful.

Thank you very much for your help.

Best regards,

Boki.

"Gernot Frisch" <[e-mail]> wrote in message news:<2q*************@uni-berlin.de>...

I knew "&apple" could get the address of apple variable, about why
we use a
(UINT16 *) command before "&apple" ?

What is this function for?

It's a 'cast 'operator'. If Apple e.g. is of the type 'INT16', but
your function requires a UINT16*, you must cast it to that type. Be
sure you know what you do, since this:

double a=5;

*((int*)&a) = 5;
printf("%d", a);

will result in a funny number. The memory used for 'a' will be cast so
the compiler thinks it really _is_ an int that you are pointing to.
Assinging the first 4 bytes of a double with 0x00000005 will result in
anything else than '5.0'.
-Gernot