(j3.2006) Interaction between F and P for output

[Van Snyder]

The list items in subclause 10.8.5 "P editing" of 08-007r2 that begin
"On output,..." are silent concerning the effect of P editing on F
editing for output.  The specification of the effect of P on F during
output is hiding in the first list item, which begins "On input,...."

With the little program

        program F_and_P
        
          print 1, 3742.0, 0.3742
        1 format ( f14.0, 4pf14.0 )
        
        end program F_and_P
        
five of my six compilers produce a program that (correctly) prints
         3742.         3742.
while one (incorrectly) prints
         3742.         0000.

This treatment of F and P interaction goes back to F66 (7.2.3.5.1,
7.2.3.6.2), F77 (13.5.7.1, 13.5.9.2.1), and f90/95 (10.6.5, 10.5.1.2.1).

The effect of P on F output would be more clearly explained in a
separate list item, say between the second and third items.  I don't
think it's possible to rearrange the first list item both to be correct
and not to hide either the input or output effect.

-- 
Van Snyder                    |  What fraction of Americans believe 
Van.Snyder at jpl.nasa.gov       |  Wrestling is real and NASA is fake?
Any alleged opinions are my own and have not been approved or
disapproved by JPL, CalTech, NASA, the President, or anybody else.