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ie. is the following program legal?
subroutine sub1(a, b) if (a > 0) b = log(a) end
program prog integer i, j call sub1(0, 0) i = 1 call sub1(i, j) end program
Does the fact that b is redefined on some invocations of sub1 imply that every
actual argument associated with b must be definable?
The language in F77 (15.9.3.2) is: "If the actual argument is a constant ... the associated dummy argument must not be redefined within the subprogram." By itself, that is not totally clear; does that mean redefined anywhere in the subprogram, or is redefinition a runtime property? From 15.8.4 it appears that "defined" and "redefined" are indeed runtime properties, so this seems to be valid. I do not have F90, but what I do have (Metcalf/Reid book) does not indicate any intent to deviate from F77 in this area.
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