From: tkoenig@netcologne.de   
      
   Thomas Koenig  schrieb:   
      
   > [I have used Fortran systems that initialized otherwise undefined   
   > data to a value that would trap, to help find use-before-set errors.   
   > -John]   
      
   That usually is still available, but optional.  An short example:   
      
   $ cat a.f90   
   program main   
     print *,a   
   end program main   
   $ gfortran -g -ffpe-trap=invalid -finit-real=snan a.f90   
   $ ./a.out   
      
   Program received signal SIGFPE: Floating-point exception - erroneous   
   arithmetic operation.   
      
   with a backtrace pointing to the offending line.   
      
   It does not necessarily work on COMMON blocks, though.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)