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| Unit 2 - An Overview http://mumpster.org/viewtopic.php?f=29&t=761 |
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| Author: | tlwiechmann [ Wed May 25, 2011 4:23 am ] |
| Post subject: | Unit 2 - An Overview |
This unit contains the core concepts of the MUMPS language. Learning the language elements will be accomplished by actually executing code that you write. Lesson 1 outlines a summary of the language elements. It is brief and meant to just give you an overview of the language. Lesson 2 gives you a detailed approach to using structured programming techniques. Each structured programming feature of MUMPS is explained. Programming exercises will either be given within the student guide or within this supplement. Lesson 3 elaborates upon the concept of an expression. An expression is the heart of the MUMPS language. It is where all the work is done. The 1995 standard defines an expression in a structured way. We have translated that into a simple layered diagram that illustrates how the language is defined – bottom up starting with the ASCII character set. It will be used to learn how to construct an expression using all elements of the language including the use of indirection. The lesson ends with a formal definition of an expression (expr). Lesson 4 covers all commands. Up to this point you have been using a subset of commands to learn the concept of an expression. This lesson elaborates upon all the commands, especially the Data Manipulation, Flow Control and I/O commands. We will cover Transaction Processing since it is extremely important. However, it is not implemented in all MUMPS systems. We will not be covering System (View) commands. |
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