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  Languages and Maintainability

Introduction to Languages and Maintainability

Programming  languages  should  allow  programs to be easily modifiable. Main features  that  languages  can provide to support modification are shown diagrammatically in fig 6.16, and discussed below one by one.

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1. Readability: As we have seen previously  that  readability  refers to how  easily we can  read the program follow the logic and even find  out the errors. In the concern of maintainability, readability shows that  while modifying and maintaining the  program, the existing program ( or software) should be in the readable form so that  program  could be easily read and modified accordingly.

2. Simplicity: The feature  is also almost  similar to the simplicity feature in concern of  reliability. So whenever we want  to modify any program if that program is simple  to use and  understand then  the developer can  modify it easily,

3.Fectoring : The  language should  allow  programming  to factor related features into one single  unit.

Example 23. If an operation is repeated in several point  of the program  it should  be possible  to factor it in a touting and replace its use by a routine call. In doing  so the program become more readable especially if we given meaningful  names to routines and is more easily modifiable  like a change to the  fragment  is localized to  the routine body.

Example 24. Several  programming language allow  constants to be given  symbolic names. Choosing  an appropriate name  for a constant promotes  readability of the  program like  we may  use instead of 3.14, moreover a future need to change  of the  value like to 3.1415would necessitate a change only in the definition of the  constant rather than in every  use to the  constant.

4.Locality :The  effect of language feature is restricted to  small local portion of the  entire program otherwise if it extends to most  of the program the task of making  the changes  can be  exceedingly complex.

Example 25. In abstract data  type  programming the change  to a data  structure, defined inside a class is guaranteed not to affect the rest of the program as long as the operations that manipulate  the data structure and invoked in the  same way.

Factoring  and locality are strongly related concepts with each  other. In  fact factoring  promotes locality in that  changes may apply  only to  the factored portion.  Consider for example them pact of factoring  on  changing  the number of digits  used to represent pi in order to improve accuracy of a geometrical computation.

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