gbase converts numbers between bases 2 (binary), 8 (octal), 10 (decimal), 16 (hexadecimal).
If you specify a number on the command line (preceded by a switch to describe the base the number is in)
the program will display that number in the four bases on the console and exit.
You can also specify the -s switch which will allow you to enter/display signed numbers. (This allows the
use of a - (minus) before a decimal number).
Just running the program without any switches will display the main window. There are four entry boxes,
corresponding to each of the four bases. You can type into any of these boxes and the others will update
automagically. The program will ignore any characters that are not allowed for that particular base. It
will only allow a - (minus) at the start of a decimal number, if the signed option is on.