XPost: comp.lang.c++   
   From: sgk@REMOVEtroutmask.apl.washington.edu   
      
   On Wed, 16 Apr 2025 07:44:08 +0000, Lawrence D'Oliveiro wrote:   
      
   > On Tue, 15 Apr 2025 18:28:31 -0500, Lynn McGuire wrote:   
   >   
   >> On 4/15/2025 6:14 PM, Lawrence D'Oliveiro wrote:   
   >>>   
   >>> On Mon, 14 Apr 2025 23:50:32 -0500, Lynn McGuire wrote:   
   >>>   
   >>>> Got rid of a few nasty bugs like:   
   >>>>   
   >>>>         iword = 6Habcdef   
   >>>   
   >>> Surely whether that’s a bug or not would depend on the type of   
   “iword”   
   >>> ...   
   >>   
   >> iword is a implicit 4 byte integer capable of storing 4 characters.   
   >   
   > I thought you got rid of all the implicit typing.   
      
   Implicit typing has nothing do with numeric storage size.   
      
   program foo   
      use iso_fortran_env, only : numeric_storage_size   
      integer :: j = 0   
      i = 6Habcdef    ! i has an implicit type of default integer kind   
      j = 6Habcdef    ! j has an explicit type of default integer kind   
      print *, i, j   
      print *, numeric_storage_size   
   end program foo   
      
   % gfcx -std=legacy -o z a.f90   
   % ./z   
     1684234849  1684234849   
             32   
      
   Many (most? all?) systems today likely have a 4-byte internal   
   representation for a default integer.  The Fortran standard simply   
   states that 'i' and 'j' occupy one numeric storage unit.  Here,   
   the size of that unit is 32 bits.   
      
   PS: The gfortran's -Wall option reports a few warnings with   
   the above code.   
      
   % gfcx -std=legacy -o z -Wall a.f90   
   a.f90:26:7:   
      
      26 |    i = 6Habcdef   
         |       1   
   Warning: Conversion from HOLLERITH to INTEGER(4) at (1)   
   [-Wconversion]   
   a.f90:26:7:   
      
      26 |    i = 6Habcdef   
         |       1   
   Warning: The Hollerith constant at (1) is truncated in   
   conversion to 'INTEGER(4' [-Wcharacter-truncation]   
      
   and similar warnings for 'j'.   
      
   --   
   steve   
      
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