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Step 1: Program Specification

 

Program development can be divided into several stages which are shown in the diagram below

 

Step 2: Program Design
Step 6: Program Maintenance
Step 4: Program Test
Step 3: Program Code
Step 5: Program Documentation

 1.       Problem Definition

This stage is the formal definition of task. It includes the specification of inputs and outputs  processing requirements, system constraints( execution time, accuracy, response time), and error handling method

 

2.       Problem Analysis

This step is the process of becoming familiar with the problem that will be solved with a computer program. The process ends when all the programmers’ questions have been resolved and requirement of the program are understood.

 

3.       Flowcharting

Ones the overall problem has been identified, the next stage of software development is program design. The programmer must decide, prior to writing his program, exactly which steps should the computer takes to solve an identified problem. This should be envisioned as a step by step procedure. The resulted diagram is called a flowchart

 

4.       Desk Checking

Another way of testing the logic of a program is to carry out desk- check that is executing the statements of algorithm yourself on a sample data.

 

5.       Program Coding

The next step is the process of transforming the program logic design into a computer language format. This stage translates the program design into computer instructions.

 

6.       Program Compilation

In general the compiler will go through a few steps:

 

a)      Lexical Analysis

Making sure all the symbols in the source code are legal and turning them into tokens for the next step

b)      Syntactic analysis: analyse the tokens, ensuring they follow the rules of the language grammar

c)       Code generation: uses syntax to create some form of intermediate language, often times assembly language

d)      Code optimization

 

7.       Program Testing and Debugging

This stage is the discovery and correction of programming errors. Few programs run correctly the first time, so debugging is an important and time consuming stage of software development. Testing stage is the validation of the program. Testing makes sure the program performs correctly the required task.

 

8.       Program Documentation

This stage is the documentation of the program so that who use and maintain it can understand it, so that program can be extended to further applications.

 

A compiler

A compiler is a computer program or sets of programs that translates text written in a high level language( source Language) into another computer language (the target language)

 

Parser
Parse tree

 

Translation
Preprocessor

                                                                                      

Assembler
Linker
Disk
OS exe Loader
Memory image
Exe file
Exe file
Object file
Assembly

 Flow diagram of a compiler

 An Interpreter

An interpreter is a computer program that executes other programs. This is in contrast to a compiler which does not execute its input program.

Syntax analyzer
Sematic analyzer
Code generator
Lexical analyzer
Intermediate language code
Interpreter
Eternal libraries
Source code

 

Execution result

exter

A  flow diagram of an interpreter

Examples of Interpreted Languages are BASIC, COBOL

Compiled languages are C, ALGOL, Visual Foxpro etc.

ASSESSMENT 1.       List and explain stages involved in program development

2.       List examples of a compiled and interpreted program

Student are allowed to give corrections to the assessment given by the teacher ,while the teacher support s them in order to guide them

See also  Memory Unit

 

See also

Program Development

SYSTEM DEVELOPMENT CYCLE

System Development life Cycle

Presentation Package

WORD PROCESSING ENVIRONMENT

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