This program (using the ReAction classes in OS3.5/9)
Lets you:-
Input 2 numbers in (Decimal 100),  (Hexdecimal &ff), (Binary %1010) 
then you Add, Sub, And, Or, Xor, Shift <<, Shift >> them.
and show the result in (Dec, Hex, Bin).

You can copy the result string (Ctrl C) to clipboard and paste (Ctrl V) to
any program that lets you paste from the clipboard.

Source code included.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 9319   19784  47.1% -lh5- 548a Feb 10  2003 BaseConvert/BaseConvert
[generic]                 1645    4130  39.8% -lh5- 5580 Feb  8  2003 BaseConvert/BaseConvert.guide
[generic]                 2142    2521  85.0% -lh5- 9f5b Feb  7  2003 BaseConvert/BaseConvert.info
[generic]                  363     551  65.9% -lh5- fbd1 Feb  8  2003 BaseConvert/BaseConvert.readme
[generic]                  531    1269  41.8% -lh5- 3acd Dec 22  2002 BaseConvert/Source/common.c
[generic]                 1197    2911  41.1% -lh5- 2869 Feb 10  2003 BaseConvert/Source/events.c
[generic]                  313     596  52.5% -lh5- ac22 Dec 22  2002 BaseConvert/Source/events.h
[generic]                 1131    3463  32.7% -lh5- 9015 Jan  2  2003 BaseConvert/Source/handelgads.c
[generic]                  330     606  54.5% -lh5- 6302 Dec 22  2002 BaseConvert/Source/handlegads.h
[generic]                  512    1623  31.5% -lh5- 5480 Dec 23  2002 BaseConvert/Source/includes.h
[generic]                 1199    3692  32.5% -lh5- df0d Jan  2  2003 BaseConvert/Source/main.c
[generic]                 1981    5663  35.0% -lh5- eda0 Feb  8  2003 BaseConvert/Source/opengui.c
[generic]                  876    2285  38.3% -lh5- 9fa3 Jan  2  2003 BaseConvert/Source/opengui.h
[generic]                 1673    1865  89.7% -lh5- e017 Jan 19  2003 BaseConvert/BaseConvert.guide.info
[generic]                 1362    1695  80.4% -lh5- 1147 Feb 10  2003 BaseConvert.info
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        15 files   24574   52654  46.7%            Mar  7  2003