Type III C lass A Program

PL/I PROGRAMMING
COMPILATION NOTES:
a. The main procedure must be
OPTIONS(MAIN) option stated.
b. Compiler diagnostics
not attempt to execute
successfully.
compiled with the
must be examined carefully -- do
a program that has not compiled
c. Conversion subroutines are noted as "warnings" in the
compiler diagnostics. This does not indicate an error and
should not affect the execution of the procedure; it merely
notifies the user of costly conversions.. The warnings may be
suppressed by the FE option.
d. The compiler produces a file "name TEXT Pi" from the
input file "name PLI Pi", except in the event of "terminal"
compiler errors.
PL/I LIBRARY
CMS uses the PL/I Version 4 Subroutine Library. The PL/I
library is called PLILIB TXTLIB. Three additional
subroutines have been added to the library: IHECMS, lHECLOK,
and IHEFILE.
LOADING A PL/I PROGRAM
Before loading a PL/I program, it is necessary to designate
that the PL/I library is to be used (the default library is
the FORTRAN library called SYSLIB). This may be done
immediately before loading. or automatically at login via
the PROFILE EXEC, by the following eMS command:
GLOBAL TXTLIB PLILIB
warning: If the loader indicates that
IBExyz are undefined. the PL/I library
designated.
EXECUTING A PL/I PROGRAM
names of the form
was not correctly
A PL/I program may be loaded and executed in a similar
manner to all the other language processors. The only
restriction is that the START entryname, if used!, must be
IHECMS which is a special initialization routine that
transfers control to the user·s main program. This routine
is automatically invoked under all other circumstances,.
The three common techniques are
342
LOAD progl (XEQ)
LOAD prog1
START
PL/I Programming