[Sussex] Re: C programming help

[Captain Redbeard]

Ahoy there,

>Geoffrey Teale wrote:
>
>Cap'n,
>
>If I'd seen your mail I'd have waded in

Never mind, I spent TWO HOURS yesterday stripping an incomplete 1,400 line program down to 100 lines to trace the source of a "Segmentation error", discovered what the problem was and handled it with <blubber>five lines of code</blubber> only to then add a few hundred more lines, compile it, run it and get <drumroll>a "Segmentation error"</drumroll><boohoo />.  I'm sure I'll be back once I've completed another bug-hunting session, oh, happy days!


>Steve Dobson wrote:
>
>The numbers of ways one can screw up the use of dynamic memory use are legion.

Yeah, tell me about it!

>I don't know of any books, I learnt the hard way, just as you are now doing.  I know, that doesn't help much does it.

Quite!

>It is a very good idea (practice) to all ways initialise any variables.

See my note above, that WAS the five lines of code :)

>You need to insert before this line:
>
>   CoordArray = (Coords *) calloc(MAX_COORDS, sizeof(struct Coords));

calloc()?  That's a new one.  Based on the advice I was given at the weekend I've been using:


    CoordArray = malloc ((sizeof (struct Coords) * MAX_COORDS));

Is calloc() the equivalent or does it work different in any way?

Anyway, I'm probably jumping in at the deep end a bit with this program as it uses a LOT of dynamic memory allocation and pointer to structs and functions but I'm learning fast, the painful way, so I think it's "ALMOST THERE (TM)."

Stay tuned!



Captain Redbeard.


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