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  Programming Style Metrics

Introduction to Programming Style Metrics

In the last section we have  discussed many  issue  and rules related  to the programming  style. The programming  style  effects the readability of a program  hence it will be very  useful if we can quantify the  programming style. In general what  is considered a good  style will also depend on the  local  coding conventions and the coding standards of the  organization. However some general guidelines for style can  be formulated. In  Jan 1985. R. E .Berry and B. A.E. Me eking proposed an approach to quantify the programming style of a program in their book, A style analysis of C programs. In this approach the following factors are considered to affect the programming style.

1. Module length : A module  length is defined  as the average length of modules in the  program. It is measured for non commented and nonblank lines.

2. Identifier Length: An  identifier length  is measured in characters. It is the average length of the user defined identifiers.

3. Comment Lines: Comment lines can be quantified as the percentage  of the comment  lines in total  lines of code of the program.

4. Indentation: The indentation is checked as the ratio of initial spaces to total number of characters. So its  relation can  be given as:

Indentation Measurement =Initial Spaces/Total Number of Character

5. Blank Lines: Blank lines take the percentage of blank with the total number of lines. As blank lines are used by programming to highlight the structure of the program so their usage affects the readability.

6. Line Length : A line  length  is find out as the average  number or nonblank characters in a line.

7. Embedded Spaces: Embedded spaces quantification can be done as the average number of embedded spaces in a line. These are significant for the readability of arithmetic and logical expressions  and declarations.

8. Constants definitions: Constant definitions quantity in a program  is measured as  the percentage of will user identifiers  that are defined as constants.

9. Reserved Words: In this case the number of reserved words and standard library functions used are counted. A  high  value shows a better use of facilities available to  the programmer.

10. Include Files : The number  of files that are include in a program is measured. This represents  how a program has been divided into files.

11. Gotos : The number of occurrences of the go to  statement  provides the total number of go to  statement  as its measurement. It  is assumed that a figure of 1 is best  that  means no use of go to statement in a program is the best case because then it will follow the structured programming principles.

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Programming Style Metric Values for C Program:

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