# FLOW CHART

A flow chart helps in showing the sequence of different approaches in solving a problem. Flow chart is very concise in nature. It identifies steps needed in solving a problem and shows these steps with connecting lines and arrows to indicate the order in which the steps are performed.

FLOWCHARTING SYMBOLS

INPUT/OUTPUT

FLOW LINES                                                                                                                                         HARD DISK

PROCESSING SYMBOL

DECISION BOX                                                                                                                                                                                                                                                                                                       FLOPPY  DISK

FOW CHART CONNECTOR

MERGE

COLLATE

EXTRACT

TERMINA SYMBOL

SORT

DISPLAY

## DESCRIPTION OF EACH SYMBOLS

Input symbol means the feeding of data and output symbol means print out of the data or display on computer screen.

 a = 12 b + 18c

Note: we can print the value of ‘a’ after feeding the values of ‘b’ and ‘c’

FLOW LINES: Flow lines are used to connect various symbols i.e. it shows the flow of logics.

PROCESSING SYMBOL: Represents the processing of data

## DECISION BOX

False(No)

IS A1 > A2                                                                        True(Yes)

Here A1 represent area of a rectangle and A2 represent area of a square. The decision symbol defines logical operation with the result of decision (with true / false or Yes/ No).

## CONNECTOR SYMBOL

Connector symbol is used for the purpose of junction. Sometimes the flow chart can’t be completed on a single page and it requires two or more pages, then the connector symbol is used to indicate another page.

## PREPARE/ INITIALISE

These symbols are used to initialize constants and variables that will be used by the program. A flowchart always starts with START and ends with STOP as shown in examples below.

Flowchart to calculate and print 60% of 450 Naira

 START
 Let Number N = 450
 Let M = N * 60/100
 Print N, M
 stop

## ASSESSMENT

1. Draw a flow chart to calculate the area of a square with sides 10cm each and give reasons why you use a symbol in all your steps

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

ALGORITHM AND FLOW CHART

PROGRAM DEVELOPMENT

Program Development

### Get A Free USA Scholarship, Visa & Accommodation

SYSTEM DEVELOPMENT CYCLE

System Development life Cycle