REXX Interview Questions and Answers
REXX (Restructured Extended Executor) is a programming language which was developed at IBM, and several implementations are available under open source licenses. It is a structured high-level programming language which was designed to be both easy to learn and easy to read. Both commercial and open source Interpreters for REXX are available on a wide range of computing platforms, and compilers are available for IBM mainframes.
REXX Interviews are getting tough these days as the technology grows faster. To get through the REXX interview one needs to update him/herself in a regular manner. Having said that, just before the interview, it is very important to have a quick glance of the reputed REXX questions and answers to make yourself comfortable during the interview process. This is where DoAnswers.com helps you in renewing yourself on REXX and various other technologies interview preparation.
11. If I have limited experience with Rexx or it's been a long time since I've used it, what kind of help is available to get me started?
uni-REXX comes with a sample library that includes a examples of a variety of application types. These include * utilities for: date calculations and conversions printing on a remote host creating new userids (AIX) running dbxw debugger on a process in another window simulating the "which" command for UNIX implementations that do not have it printing a visual depiction of a directory structure * functions to: convert a system-independent filename into a local filename perform specialized string search add math functions to uni-REXX * filters to: uppercase all characters in an input stream replace simulated box drawing (using "|", "+", "_") with real box drawing characters remove backspace characters from an input stream (useful for reformatting the output of a man page for ASCII printing * illustrations of using the APIs to embed uni-REXX as a scripting language in compiled language applications * example of using the UNIX-specific functions for a client/server application
12. Is ooRexx compatible with IBM Object REXX?
Yes!
13. Is ooRexx compatible with Rexx?
Yes!
14. Is there an AIX version of ooRexx?
ooRexx for AIX is available starting with the 3.1 release.
15. What about warranties, maintenance, and upgrades?
uni-REXX is delivered with 90 days' free support. This entitles you to technical support during the period in which you install and begin to use the product. It also entitles you to any upgrades that may be distributed during that time. An extended maintenance contract is also available for technical support and automatic upgrades. For those who do not choose extended maintenance, upgrades may be purchased at a percentage of the current list price.
16. What assurances do I have that my uni-REXX applications will be portable? Does uni-REXX conform to any standard?
The Rexx language is defined by M. F. Cowlishaw in The Rexx Language, A Practical Approach to Programming (Prentice-Hall, 2nd. Edition, 1990), which documents Rexx Language Level 4.00. Most implementers of Rexx interpreters (including The Workstation Group) conform to this language definition. uni-REXX V2.00 and later releases deliver all of the features included in Language Level 4.00. In addition, the American National Standards Institute (ANSI) standard for the Rexx language was published in May 1996 as ANSI standard X3.274:1996, Programming Language Rexx . TWG is a member of the X3J18 committee that developed this standard and that is continuing its work toward a second standard. TWG has made a commitment to insure that uni-REXX conforms to these standards.
17. What if I have problems or questions?
Technical support is available by telephone, email, or FAX. Product specialists with extensive experience in both the mainframe and UNIX environments are available to assist you with a broad range of questions. Telephone support is available from 8:30 A.M. to 5:00 P.M.Central time Monday through Friday. We are also happy to answer your questions by email or FAX.
18. What if I need to have the same application running on multiple platforms, such as UNIX and the mainframe? Does that mean I have to maintain two separate sources?
Not at all. Rexx includes an instruction that allows you to determine the environment in which your program is running. PARSE SOURCE will give you a string in which the first token is the name of the system where the program is running. For uni-REXX, this is "UNIX"; on the mainframe, it would be "CMS" or "TSO". Then you can put conditional processing into your program based on the current execution environment. In a program that needed to display a current listing of files, you might set your master source up something like this: parse source env . select when env = 'UNIX' then command = 'ls' when env = 'CMS' then command = 'listf' when env = 'TSO' then command = 'listc' otherwise call OS_error_routine end : : [ to do a list command, you write]> : command /* value is sent to OS */
19. What is the difference between ooRexx and IBM's Object REXX for Linux/Solaris/AIX?
Due to licensing issues mentioned above, the rxftp function package is not available. For this reason ooRexx supplies a full (and more powerful) replacement in the form of the easy to use rxFtp class which is fully documented in the rxftp.pdf document or as an HTML document. The differences with the versioning details as described in the Windows differences above is also applicable to these ports.
20. What is the difference between ooRexx and IBM's Object REXX for Windows?
IBM's Object REXX was available in two formats; an Interpreter Edition and a Development Edition. ooRexx will be available in one format which is half way between the two IBM offerings. There will be no functional difference between the Object REXX and ooRexx interpreters; code written for Object REXX will work with ooRexx with the following minor exceptions related to product versioning: The result from PARSE VERSION using the last version of Object REXX is: OBJREXX 6.00 dd mon yyyy The result from PARSE VERSION using the first version of ooRexx is: REXX-ooRexx(MT) 6.00 dd mon yyyy This change was done for two reasons; the first is that ooRexx is a different product, and the format of the result is now ANSI compliant. The output from rexx -v using the last version of Object REXX is: IBM Object REXX Interpreter Version 2.1.3 Build date: Mar 31 2004 Copyright (c) IBM Corporation 1996, 2004. All Rights Reserved. The output from rexx -v using the 3.1 version of ooRexx for Linux is: Open Object Rexx Interpreter Version 3.1.0 for LINUX Build date: Aug 15 2006 Copyright (c) IBM Corporation 1995, 2004. Copyright (c) RexxLA 2005-2006. All Rights Reserved. This program and the accompanying materials are made available under the terms of the Common Public License v1.0
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