Rexx is the acronym for Restructured Extended Executor. It is a high-level programming language developed by Mike Cowlishaw to make learning and reading easier. There are multiple applications of Rexx. It is used as scripting and for processing data. It is also as an internal macro language in some software like THE and ZOC. Rexx is a versatile programming language and can be mixed with various commands to different host environments. It is a very useful language for beginners and the demand for experienced computer professionals is growing exponentially.
This blog covers important Rexx interview questions that can help you ace your Rexx interview. If you wish to stand out from the crowd, these interview questions are your best friend.
Uni-REXX is a UNIX implementation of Rexx programming language which offers rich sets of functions that are particularly designed for UNIX environment. Uni-REXX is now available on SUN’s Solaris 7/8/9, H/P’s HP/UX 10/11, IBM’s AIX 4/5, SGI’s IRIX 5/6, NCR UNIX, Linux Intel and S/390. It is used for several purposes such as automating system administration tasks. It also helps in development for end-user applications and rapid-prototyping of complied-language applications.
Following are the few features of Rexx-
Rexx offers a rich set of functions other than the standard language features. These functions are designed specifically for the UNIX environment. The functions are categorised in the following groups-
there are wide Application Programming Interfaces (APIs) available in uni-Rexx. These APIs help in starting a new Rexx programming language from a compiled language program. It can access Rexx program variables and Rexx program stacks. These APIs also help to define new host command environments for Rexx. If you want to specify user-supplied exits or terminate the Rexx programmes, these APIs can be used. Add user-defined functions called by Rexx programmes with the help of API.
In the same library offered by Uni-Rexx, we get a variety of applications such as-
Uni-Rexx is a simple language for beginners. It is a high-class versatile programming language that comes with a room of benefits for its users. The uses of Uni-Rexx programming language are-
Yes, it is possible to port the existing applications from the mainframe or Os/2. Also, you can port with minimum alterations. However, the following modifications are required-
there are some inbuilt functions available in various programming languages. Rexx also comes with certain inbuilt functions. They are-
There are various error conditions seen in Rexx. They are:
Rexx supports do loop, do-while loop and do-until loop. Do loop is used to execute a statement for a given number of times. The do-while loop is used to stimulate the simple while loop which is present in other programming languages. Do-until loop exits when the condition is false.
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