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The revised algorithm and flowchart to make a telephone call to your friend are:

Algorithm Flowchart

Step 1: Pick up the mobile phone. Start

Step 2: Open the dialler app. Pick up the mobile phone

Step 3: Dial the phone number of your Open the dialler app
friend. Dial the phone number

Is
Step 4: If the dialed number is busy, go to the dialled number Yes
Step 5. busy?
No
Else, talk when someone answers. Talk when someone answers

Step 5: End the call. End the call

Stop
Knowledge Discovery Subject Enrichment

A Decision box always divides a flowchart into two parts. As the number of decision boxes
in the flowchart increases, the different paths the flowchart takes may also increase. But
they all must end before the Stop box.

Example 4: Write an algorithm and draw a flowchart to find the smaller of two numbers
A and B.

Algorithm Flowchart
Step 1: Read the two number A and B. Start

Step 2: If A = B, display ‘Both numbers Read A and B
are equal’, else Is A = B? Yes

No
Print
Step 3: If A < B, display ‘A is smaller’, No ‘Numbers are equal’
else display ‘B is smaller’. Is A < B?
Yes
Print Print
‘B is smaller’
‘A is smaller’

Stop

Try This Computational Skills

Revise the algorithm for calling your friend to show what needs to be done if no one
picks up the phone when you call. Draw the flowchart for the revised algorithm.

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