incrementing

[Alan Anderson]

Originally Posted by TimCraig

i++ and its prefix version ++i only add one. There's no way to increment by a different value using this notation...

Here's something few people know about C: pointer arithmetic scales integers by the size of the type being pointed to. For example, if ptr is a pointer to an int, then ptr++ will add 2 (or whatever the native size of an int is for a particular target). If parr is a pointer to a structure of twelve bytes, parr = parr + 3 will add 36.

But don't abuse this fact. Pointer arithmetic is not necessarily something useful for programming PIC processors to control FRC robots.

[Qbranch]

*chuckle

well yeah theres lots of ways to say it, but it all compiles the same. personally, <operator>= is my favorite. but hey, thats just me.

see you all later... i'll be rockin out to them xm seasonal channels

-Q

[TimCraig]

Originally Posted by Alan Anderson

Here's something few people know about C: pointer arithmetic scales integers by the size of the type being pointed to. For example, if ptr is a pointer to an int, then ptr++ will add 2 (or whatever the native size of an int is for a particular target). If parr is a pointer to a structure of twelve bytes, parr = parr + 3 will add 36.

But don't abuse this fact. Pointer arithmetic is not necessarily something useful for programming PIC processors to control FRC robots.

That's true, however using a pointer that way for general arithmentic and casting it back to an int type would definitely be abusive and the programmer need not apply for a job in my shop.

One place I've used pointer arithmetic along those lines with the PIC is to be able to treat the PWM outputs as an array. Although there the increment in address defaults back to 1.