Best visuals: <imagen!isaak> Mark Isaak    	Mark Isaak	Imagen Corporation	2650 San Tomas Expy.	Santa Clara, CA 	95052-8101	USACompile with:	cc -DI=B -DO=- -Dy isaak.c -o isaakExecute without arguments.The original entry starts with the line:	main(){};This works on some 4.3BSD systems.  Why?  Note that #include <stdio.h>is given on the last line.  Why is this needed?  Note the unusual callsto sprintf.NOTE:  The program relies heavily on ASCII.  Don't even think of       running it on an EBCDIC machine.  If you name the file anything        other than "isaak.c", you must change the #include on line 7.NOTE: The use of null comments to separate macros to construct different       tokens from a single macro (e.g., "O/**/O" creates either "++" or "--"       by defining "O" to be "+" or "-") may cause some strict ANSI      C preprocessors to object.NOTE: Most System V machines will not be able to execute this program      correctly due to the fact that BSD style systems have an sprintf()      that returns a char *.Due to the above problems, we have replaced the output of this programin the file: isaak.encode.  To read this file do:	uudecode < isaak.encode	cat isaak.outputFYI: We are likely to be more strict about portability in the future.