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SS2 Third Term Computer Studies Lesson Note – Program Development II

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WEEK 3

TOPIC: PROGRAM DEVELOPMENT (CONT’D)

CONTENTS

Steps/ Description involved in Program development
Examples of (i) Interpreted programs (ii) Compiled programs

Sub-Topic 1: STEPS / DESCRIPTION INVOLVED IN PROGRAM DEVELOPMENT

Problem Definition
Problem Analysis
Flowcharting
Desk Checking
Problem Coding
Program Compilation
Program Testing /debugging
Program Documentation

Description of each of the stages

Problem Definition

This step is very important for the completion of a satisfactory program. It is impossible to solve a problem without a clear understanding and identification of the problem. The programmer is expected to first of all understand the problem and know exactly what the program requires. Inadequate identification of problem will lead to poor performance of the system. The programmer should put his significant portion of time in problem identification. If he does not spend enough time at this stage, he may find that his well-written program fails to solve the real problem.

Problem Analysis

This stage is the formal description of the task. It includes the specification of inputs and output processing requirements, system constraints and error-handling methods.

Flowcharting

This involves putting the steps in program development in diagrams. This makes them useful tools for communicating how processes work, and for clearly documenting how a particular job is done. Furthermore, the act of mapping a process out in flowchart helps you clarify your understanding of the process, and helps you think about where the process can be improved. An algorithm is a sequence of steps written in a non-stylish programming language usually referred to as pseudo code.

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