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.

 

Read a, b, c

 

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

 

See also

ALGORITHM AND FLOW CHART

PROGRAM DEVELOPMENT

Program Development

SYSTEM DEVELOPMENT CYCLE

System Development life Cycle

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