http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46087
Summary: Double precision values, when read in from data file, include random trailing numbers Product: gcc Version: 4.5.1 Status: UNCONFIRMED Severity: major Priority: P3 Component: fortran AssignedTo: unassig...@gcc.gnu.org ReportedBy: kyle.s.wil...@gmail.com Example code: program test_dble real(8) :: a,b integer :: x,y open(unit=11,file='testdble.dat',status='old') read(11,*) a read(11,*) x read(11,*) b read(11,*) y write(*,'(f22.20)') a write(*,'(f22.20)') b print*, a print*, b print *, x print *, y close(11) end program test_dble testdble.dat: 2.18 5 4.2 55 I am converting from using Absoft f77 compiler to the lastest version of gfortran and when comparing the results, gfortran adds random trailing numbers onto the end of the double precision numbers. The number SHOULD have all trailing zeros and no other numbers. Results using gfortran 4.5.1: 2.18000000000000015987 4.20000000000000017764 2.1800000000000002 4.2000000000000002 5 55 Results using f77: 2.18000000000000000000 4.20000000000000000000 2.18000000000000 4.20000000000000 5 55 The program was not compiiled using any compiler flags. Thanks.