https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69456
--- Comment #3 from Josiah Schwab <jschwab at gmail dot com> --- (In reply to kargl from comment #2) > (In reply to Josiah Schwab from comment #0) > > > > I read the code for the function parse_real in libgfortran/io/list_read.c > > and this behavior appears to exist because the value '1+1' is permitted as a > > shorthand for '1e+1'. This was also surprising to me. > > > > I read the Fortran 2008 specification. I had difficulty fully understanding > > it, but I failed to find a place where it said that exponent-letter can be > > legally omitted. A look at the list of gfortran vendor extensions as well > > as a web search also failed to provide additional information. > > > > > > See Table 10.1, "E and D Exponent Forms" in Fortran 2008 standard. Thank you. If I understand correctly, that makes it clear that r3 & r4 in my example do conform to the standard. The behavior of r1 & r2 still seems wrong. (But I am very inexperienced at reading standards, so please do correct me.)
