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Rick Baird hit the nail on the head.

The second parameter of %subst must be an integer value. If the length of cTitle is odd, dividing it by 2 gives a non-integer result. Adding %int, as shown below, compiles and runs correctly.

/free
  title = %subst(title:%int((%size(title) - %size(cTitle) / 2)));
/end-free

Booth Martin wrote:
%subst as a result.

I can't figure out two problems I believe are simply solved by others.

I wish to populate a field with a constant, and center the text.

Lets say we have a field called Title that is 40/alpha.
Lets say we have a constant field of cTitle, with a value of 'Screen Title"

I know how to do this with several lines of code, but I'd like to use %subst

I believe this should work, but it doesn't compile:

   C   eval  %subst(Title:
   C            ((%size(Title) - %size(cTitle) / 2)
   C             = cTitle

This does not compile and I can't see why not.

If it did compile I would then ask my other question. How does one also clear the target field? Must that be done first?



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