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  Do of Good Programming Style

Do's of Good Programming Style

Dos of good  programming  style  do mean  that to achieve  the better  programming  style we should follow  them. Various Dos of good programming style are listed in table 6.8.

Within the context of software  engineering the term meaningful means meaningful from the viewpoint  of future maintenance programmes. So  it is better for a programmer to  give  names to variables  that are meaningful to only that programmer. Because most variables in a program reflect some  entity in the problem  domain, so  variable names  should be closely related to the entity they represent.

Meaningful variable names don't require comment statement  to express the  meanings of variable  names, even  they are self explanatory about  themselves. And it is bad practice to choose cryptic names ( just  to avoid typing )  or totally unrelated names. 

Following  example  shows  the good  use of meaningful  variable names .

Example 1.  Consider  an expression to find out the circumference of a circle. If we don't use meaningful variable  names them  the expression  can  be written as :

C =2 × p × r

Here were requiring the comments statements to explain the meanings of these variable names C, p and r. But if we use meaningful variable names it will be like:

Circum = 2× pi × red

Here all three variables are  self explanatory. Circum represents circumference pi has a constant value and red is radius  of the circle.

Now, if I about the  meaningful variable names, then  the following variable names are according to  our need like add1 add2. But such type of variable names  may lead us to the typographical error. These typographical errors are not  detected by the complier and even they may lead program logic errors. So we should  choose the meaningful  variable names but avoiding to put 1,2, etc. On the  right  side of the variable names. In addition  to the use of meaningful  variable names  it is equally essential that variable names be consistent. This concept is better understood with the help of following examples.

Example 2. Consider a module in which  followings four variables are declared:

Average freq frequency maximum  min Fr, Frqncytot.

A maintenance programmer who is trying  to understand the code has to know  if freq, frequency, fr and frequency , all  refer to the same things. If yes then  the identical word should  be used like frequency. But  if one  or more variable  names refer to different quantity then a totally different name, such as rate should be used.

A second aspect of consistency is the ordering of the components of variable names.  An example is given below to discuss this  concept.

Example 3. If one variable  is named frequency maximum then the name minimum frequency would  be confusing. It should  be frequency minimum. Thus  in order to make the code clear an unambiguous for future maintenance programmers the four  variables listed previously should be named  frequency average frequency maximum, frequency minimum and frequency total respectively.

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