> i came across the following 'for' statement in a code:
>
> for (pass=rx_str[ptr1+1]; ptr1<size && pass; ptr1++) {
>
> i'm curious about about the 'ptr1<size && pass' of the statement as i
> have never come across a for loop layed out in this way.
> 1. is this valid?

Yes, it is valid.  It is unclear code, and I'm not sure that it does what
the author wanted it to do.

> 2. if so, is it the same as saying 'ptr1<size && ptr1<pass' ?

No, it's the same as saying

(ptr1<size) && (pass!=0)


The reason I was suggesting that it may not do what the author intended is
because the first statement:

pass=rx_str[ptr1+1] gets evaluated exactly one time, so pass does not get
updated each loop iteration.  Unless pass is updated in the loop body, or
the programmer intended to only test the 'firsrt' value of pass, then the
code is probably broken.

-Steve

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