Eugene Griessel wrote:
rajeev wrote:

i want to know about how to make a program in DOS.

Sky and Tel has some basic programs which you can run in DOS. Years ago
I translated them to REXX for OS/2 and currently run them in Linux on
occasion but these programs have been superseeded by far superior ones
such as XEPHEM which is free for simple, inexpensive for full, package.