http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54514
Bug #: 54514 Summary: g0 output format has too few digits when writing reals Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran AssignedTo: unassig...@gcc.gnu.org ReportedBy: clivegp...@gmail.com As far as I can see, writing a real value with g0.d should produce the same output as f0.d for reasonable values of d, provided the value is in range for fixed-point rather than exponential output. This test program shows the problem: program gformat implicit none real :: pi = 3.1415926535 write(*, '(a,f0.3,a,g0.3,a)') 'f0.3:"', pi, ' g0.3:"', pi, '"' end The results give f0.3:"3.142" g0.3:"3.14" The relevant part of the F2008 Standard is 10.7.5.2.2 subsection 4. Regards Clive Page