what is at 0 address in a program?

[Simon Biber]

I've seen better "solutions" to this by printing "<nil>" for NULL "%s"
values. This makes the cause more obvious.

And it's easy to implement without actually dereferencing the given
pointer, so you can keep your useful core-dump behaviour for when the
program actually does try to dereference a null pointer.

 

[Mabden]

And it's easy to implement without actually dereferencing the given
pointer, so you can keep your useful core-dump behaviour for when the
program actually does try to dereference a null pointer.

And, if you read K&R, it is implied that Null and all bits zero are the
same. In a very long thread in a distant time of the "long ago", Keith
Thompson quite successfully showed how this is not a truth.

I suggest that the person who coded that software was under the same
misguided idea. It is however, not guaranteed by the standard.

 

[pete]

Mabden wrote:

And, if you read K&R,
it is implied that Null and all bits zero are the same.

And, if you read K&R,
you'll find that "Null" isn't in it.

What do you think you're talking about?
null character ?
null pointer ?
NULL ?