[Bug fortran/98701] I compiled a program with gfortran on Mac (Big Sur, version 11.1) and g77 on Windows 10. I get two very different results for identical input files with the results from the one compiled by gfortran being wrong.

[sgk at troutmask dot apl.washington.edu via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98701

--- Comment #8 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Fri, Jan 15, 2021 at 05:21:22PM -0800, Steve Kargl wrote:
> 
> You're using undefined variables.
> 

I little more debugging, 

      read(5,*) estrt,esfinal,eincr
      if(eincr.gt.0) xnumber=(esfinal-estart)/eincr

estart is undefined here.  I suspect you want estrt.