http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48602
--- Comment #3 from Thomas Henlich <thenlich at users dot sourceforge.net> 2011-04-15 19:58:55 UTC --- (In reply to comment #2) > I am missing something here: > > "print "(RU,G15.2)", .991d0 > prints 1.00 but the expected result is 1.0 because 1 - r * 10**-2 < .991 with > r > = 1 because of UP rounding mode" > > We are asking for two decimal digits in g15.2 above so 1.00 looks right to me. No. The d in G editing describes the number of significant digits, not the number of decimal digits. Fortran 2008: 10.7.5.2.2 states clearly (first table in clause 4) that for a value which rounds to a value greater or equal to 1 and smaller than 10 the equivalent conversion is F(w-n).(d-1) and n blanks. Thus the number of significant digits is d, because 1 digit comes before the decimal separator and (d-1) digits after it. GFortran does it right in most cases, except the ones described in this bug: UP/DOWN rounding with values close to 1 (or other powers of 10) which would round differently if COMPATIBLE rounding was in effect.
