CompHEP software is written in C and Fortran.
The symbolic part is done in C. The numerical one was written in Fortran
but later on was converted to C. However both versions of numerical part are
now available. The C programs use a graphical window interface based on
the X11 or MS-Windows facilities,
whereas the Fortran ones use only a standard input/output.
So in the latter case the service is more ugly.
