Introduction to Analysis of Preliminary Design
If any error occurs that should be removed and top level design specification must be modified and corrected. If this is not then the design specification are correct and can be used for further processing.
Main data Structures
In this simple program we only require three integer values and no complex data structure its required so we will concentrate on these integer data types only.
High Level Program Structures
After developing the top level design specifications analyzing them and mentioning the required data structure now we will see the high level program structure, which may contain some functions and procedure calls definition in itself.
Considering or problem of calculating the sum of three integer number we will develop a high level program structure for it which will follow the steps 6.7.1,6.7.2. and 6.7.3. such high level structure ( or outer layout ) is shown bleow,
Main ( )
Begin
Int a, b ,c, sum
Print f ( %d %d &b &c )
Sum + calsum( a, b, c, )
Print f ( %d sum )
end;
As we see in fig 6.41, we have made a function call named cal sum (a, b, c,) and it calculates the sum of three numbers and returns back the computed values to the main program.
Detailed Design Description
Fig 6.41 shows the high level program structure which calls a function to perform the addition of three numbers. So now have to describe the detailed design of this programs structure and mention the complete function structure. Fig 6.42, shows the function called by program structure mentioned below
Calsum ( x, y, z, )
Int ,x, ,y, z,
Int d;
D= x+ y+ z:
Return ( d)
End
So in such a manner the whole detailed description of a program is provided during this step.
Program development Process
As the high level program structures an d detailed design description have been mentioned, now in this step they must be converted into the code. This code will then be tested during testing activity for checking the faults and then debugging is performed to locate and correct the errors.
Code Documentation
After source code is generated the function of a module should be apparent without reference to design specification that means the code must be understandable. In this direction many corporate or organizational standards and procedures must focus on the descriptions accompanying a collection of programs i. e. The code documentation. the code documentation is considered to be defined as:
It is a set of written descriptions that explain to a reader what the programs do and how they do it.
These code documents reports are a vital part of good software development practice.
Good code documents are very useful and serve the following purposes:
Internal Documentation
In the coding phase the output document is the code itself. However some amount of internal documentation in the code can be extremely useful in enhancing the understand ability of programs. So it contains information that is directed at someone who will be reading the source code of your programs. Thus summary information is provided to identify the program and describe it data structures algorithms and control flow. Usually this information is placed at the beginning of each component in a set of comments called the header comment block.
Comments
Internal documentation of programs is done by the use of comments. All language provide a means for writing comments in programs. Comments are textual statements that are meant for the program reader and are not executed. Comment if properly written and kept consistent with the code can be invaluable during maintenance.
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