Best Layout:

Dean Swift
Trinome Communications
7, Jeffries Passage
Guildford
Surrey
GU1 4AP
England

http://www.tc3.co.uk/~gandalf/G.HTML

To build:

    make all

NOTE: This entry might not compile when using modern compilers.

To run

./gandalf

Judges' comments

Also try:

PATH=.:$PATH
./hatcat
./cathat

 And next try:

./cathat
`pwd`/cathat

 Care to guess why these execute differently?  Only the
 compiler knows ... ok maybe other things like the author,
 the judges and maybe you too?

 For mis-leading C pre-processor output, try:

cc -E gandalf.c

Author's comments

The program requires an ASCII system.