Re: csapp, really good?

[Johnny Billquist <bqt%update.uu.se@localhost>]

On 2019-07-09 13:25, Andrew Luke Nesbit wrote:
> On 09/07/2019 09:09, Dan LaBell wrote:
> > And, Practical C Programming, Steven Oualline
> > (which I will part with in moment, and never really needed, but I will
> > still recommend it) because it contains every scold you would know by 
> > heart,
> > if you learned programming, in the unix lab.
>
> I see this book often and have skimmed through it once or twice.  I 
> never saw anything particularly compelling about it.  I will have a 
> closer look next time.
>
> Understanding the dark corners of C is essential to understanding the 
> language properly.  More importantly, it's important to know how to 
> protect oneself against widely propagated misinfomation.  An example of 
> this kind of _misinformation_ is that arrays and pointers are the same.

That partly stems from the unfortunate double meaning of a pointer, and 
also partly because of a little sloppy use of natural languages.

When we say "pointer", do we mean a pointer variable, or the content 
that a pointer variable might store.

The r-value of a pointer variable is the same as the r-value of an array.

However, the l-value of a pointer variable is a pointer to the variable 
itself, while an array do not have an l-value.

So an array and a pointer variable are certainly not the same thing.

But a pointer, in the meaning "an address", is always an address, don't 
matter what it points to, or where you got that address from.

  Johnny

--
Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt%softjar.se@localhost             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol