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I don't know why this statement fails on V4. My best guess is that the
V4 level compilers incorrectly assume that the intermediate result is an
unsigned number. It's true that the output of the %scan() BIF is an
unsigned number, but when you subtract 1 from it, the intermediate
result SHOULD be a signed number (and it is in V5). I can only guess
that this is a bug in the older compilers that IBM fixed before V5R1 was
released.
An easy workaround is to make the code look like this:
c eval pos = %scan('?': path)
c eval pos = pos - 1
That should achieve the exact same results, but since the subtraction is
on a separate statement, the compiler should make a different decision
about the intermediate result.
James Lampert wrote:
Given that "path" is 32767A, and VARYING, and that POS is either 10I or
29P 0, why would
eval pos = %scan('?': path) - 1
give an MCH1201 error when executed?
Compiler is V4R2; OS is V4R4. Also fails under V4R5. Also fails if
"path" is 255A VARYING.
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