what is the hierarchy of a cobol program?

nandeshwar · New User Joined: 11 Oct 2010 Posts: 45 Location: Delhi

hi..
can anyone tell me what is the heirarchy of a cobol program? and what is the relation between the cobol program and the PARMLIB ,DRVR and ALM which is defined inside the corresponiding programme???

please let me know if u dint understand my query..

thanks,
nandeshwar

Anuj Dhawan · Posted: Mon Nov 29, 2010 3:23 pm

nandeshwar · New User Joined: 11 Oct 2010 Posts: 45 Location: Delhi

hi anuj,

With cobol hierarchy , i mean hwo does the cobol program works/? for example if we take example of any C or C++ program. we have defined libraries and file sfrom which the program extracts its defintions and parameters. Similarly how does the cobol program works.?

thanks,
nandeshwar

enrico-sorichetti · Posted: Mon Nov 29, 2010 3:41 pm

the attempt to explain confuses things even more!

in IT using the correct terminology is the base for good communication and understanding

a cobol program works according the way You write
( but that applies to any program )

as far as the cobol compiler is concerned
here is a link to a list of bookshelves where You can choose the cobol version You are interested
and proceed from there with Your reading
www-03.ibm.com/systems/z/os/zos/bkserv/zappls2.html
look for ENTERPRISE COBOL

but please do not confuse the way compilers work on PC' s and zOS

on the PC the gcc is not a compiler,
is a driver that invokes in sequence all the program needed to produce the final result according to the flags ( -E -c -s ... )

under the IBM mvs class of operating systems ( zOS for example )
a compiler is just that... a <something> that takes a source and produces an object
( to be processed later by the binder/linkage editor )

nandeshwar · New User Joined: 11 Oct 2010 Posts: 45 Location: Delhi

@ enrico-sorichetti

thanks... I will keep ur suggestion in mind .

regarding the post:
actually my question was what does Parameter libraries are called? please see the below snapshot of a program m working on:

//*
//AAFJOBPI DD DSN=C&LCP.&SYS..SH.BMP&THDCO..PARM(&JOBPRM),
// DISP=SHR
//*
//AAFDRVPI DD DSN=C&LCP.TA.SH.BMP&THDCO..PARM(&DRVR),
// DISP=SHR
//*

please see the underlined parameters. Now my question is how does the program calls these parameters which are defined at another location. Hope this is not confusing.

enrico-sorichetti · Posted: Mon Nov 29, 2010 4:37 pm

the program does not call anything ...

those are files that are read by the program

so You need to look at the program documentation to find out about the DDNAMES used

and the content of the related files

nandeshwar · New User Joined: 11 Oct 2010 Posts: 45 Location: Delhi

thanks enrico-sorichetti for your help :-)

Marso · Posted: Mon Nov 29, 2010 5:41 pm

Anuj Dhawan · Posted: Mon Nov 29, 2010 5:53 pm

And &JOBPRM are &DRVR symbolic parameter, must have been susbtituted from PROC/JCL...

nandeshwar · New User Joined: 11 Oct 2010 Posts: 45 Location: Delhi

@marso

yeah actually it is the PROC statement.