Please how can I use WATFOR 77 software to code and run the following Fortran program:

INTEGER SUM
SUM = 0
DO 10 D = 1,7
IF (K.GT.3) THEN
SUM = SUM + K
ELSE
SUM = SUM * K
ENDIF
PRINT* , SUM
10 CONTINUE
END

Oh My!!!!

Tell me where they are still using Fortran?!?!

The people that wrote WATFOR were in my classes at the University of Waterloo in Ontario back in the 60's.

(WATFOR stands for Waterloo Fortran.)

Fortran was developed in the 1950s by IBM. It's still in use, but has definitely been updated since then. They're in the works to release a new and updated version of Fortran in (they think) 2008.

I have never used the language before nor even taken a class in it. I mostly did Visual Basic and Perl. But it is out there.