Page 28 - Compact Numerical Methods For Computers

18 Compact numerical methods for computers

The use of an include file which is not a complete procedure or function is not
permitted by Turbo Pascal 5.0.
2. The same program code (startup.pas) allows an output file to be specified so
that all output which appears on the console screen is copied to a file. The name
for this file is stored in the global variable confname, and the file is referred to in
programs by the global text variable confile. Output is saved by the crude but
effective means of duplicating every write(. . .) and writeln(. . .) statement with
equivalent write(confile, . . .) and writeln(confile, . . .) statements.
3. To make the algorithms less cluttered, these write and writeln statements to
confile do not appear in the listings. They are present in the files on diskette.
4. To discourage unauthorised copying of the diskette files, all commentary and
documentation of the algorithm codes has been deleted.
5. To allow for execution of the programs from operating system commands (at
least in MS-DOS), compiler directives have been included at the start of all
driver programs. Thus, if a compiled form of code dr0102.pas exists as
dr0102.com, and a file dr0102x contains text equivalent to the keyboard input
needed to correctly run this program, the command

dr0102 < dr0102x
will execute the program for the given data.