Thread: Funny array behaviour. Please Help!

Originally Posted by polarbear

But that happened within the range of the array. How can it be modified by some phantom?

Ok think about 2 arrays declared in sequence...

Code:

char a[16], b[16];

These will be in memory like this...

Code:

AAAAAAAAAAAAAAAABBBBBBBBBBBBBBBB

C does not do range checking... so you can easily walk off the end of one array into the beginning of the next...

Code:

AAAAAAAAAAAAAAAABBBBBBBBBBBBBBBB
xxxxxxxxxxxxxxxxxxxxxxxx

So now you are writing to a[i] but actually changing the contents of array b.