Experimental Physics and
Industrial Control System

Michael Davidsaver <[email protected]> · Tue, 18 Oct 2011 11:55:59 -0400

On 10/18/2011 11:30 AM, Andrew Johnson wrote:

Hi Michael,

On 2011-10-18 Michael Davidsaver wrote:

I've stumbled onto an interesting behavior of aSub.  I want to write a
function which takes a CHAR array as input (a long string).  Sometimes
the string can legitimately be empty (length 0).  What I find is that
when the the input should go from non-empty to empty it does not, and
instead keeps the previous value.

The number of elements of a long string (char array) must always include the
terminating nil character, thus an empty string must have an element count of
one, not zero.  If you don't include the terminator in your element count your
string might get old garbage appended to it.

Ok, so this covers the case of long strings. What about other types

(eg. DOUBLE)? Isn't this an issue of general correctness/proper error

reporting?

Michael

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System