Program Life Cycle:-
Program Development Life Cycle
The Program
Development Life Cycle is a set of phases and steps that are followed by
developers to define, design, develop and maintain a computer program. Typical
phases of the life cycle are:
• Gather and Analyze the Program
Requirements:
The developers must obtain the program
requirements from the users and document the requirements. Typically, a
standard form is used to develop the requirements.
• Design the User Interface:
After understanding the requirements, the next
step is to design the user interface. Typically a business information system
consists of more than one program – it may have several forms, few reports, and
other programs. The users interface defines all the input forms, output
reports, programs, and menu system to organize all these objects.
• Design the Program:
A business
function when implemented in a computer system is termed as a program. Before a
program is developed, it must be designed. Program developers use tools such as
pseudocode, flow chart, and hierarchy chart to design programs.
• Code the Program:
After a program is designed, it is
implemented. A program code is a
set of
instructions developed by a programmer to carry out the business functionality
in a particular language such as VB, C#, Java, ASP, etc.
• Test the Program:
As the
program is being coded, and after the code is completed it
must be
tested to see that program is running properly and it produces required
outputs with
appropriate input data.
• Document the Program/System:
As a program
is being coded, and after the coding is completed, the developers should
document the program. Documenting a program means writing down some instruction
for the users, the purpose of the program, the way it performs the tasks, the
inputs and the outputs expected. Once each program or sub-program is
documented, it is necessary to create documentation for the whole
business
information system.
• Maintain the Program/System:
After the
programs are developed and documented, it is placed into operation. During the
operation, a program may fail to perform its objective and it might be
necessary to add new functionality to a program or system.
Changing
program design, coding, and updating programs are part of maintenance.
Algorithm:-
One example
of any small program through Algorithm:-
Example No.1
An algorithm to calculate even numbers between
0 and 99
1. Start
2. I ← 0
3. Write I in standard output
4. I ← I+2
5. If (I <=98)
then go to line 3
6. End
Example No.2
Write algorithm to find the greater number between two
numbers
Step1: Start
Step2: Read/input A and B
Step3: If A greater than B then C=A
Step4: if B greater than A then C=B
Step5: Print C
Step6: End
Step2: Read/input A and B
Step3: If A greater than B then C=A
Step4: if B greater than A then C=B
Step5: Print C
Step6: End
