Hi -
1. Here's a short FAQ on how to create shortcuts do other stuff
with your KDE desktop:
http://kde.sw.com.sg/documentation/en/UserGuide-6.html
2. You might also wish to experiment with re-writing your math
program to use a GUI (instead of standard "printf()" and
"scanf()" from the commend line).
Since you're already using C, then GTK+ might be a good choice:
http://bo.majewski.name/bluear/gnu/GTK/plain/index.htm
3. Perhaps you might instead wish to use a completely different
language, other than C (or C++ or Java, all of which can have
a considerable learning curve).
In that case, may I recommend trying Python/wxPython:
http://wiki.wxpython.org/index.cgi/Getting_20Started
Your .. PSM