Page 128 - Computer - 5

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

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

Step 5: End the call. Talk when someone answers

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

Step 3: If A < B, display ‘A is smaller’, No Print

else display ‘B is smaller’. No Is A < B? ‘Numbers are equal’

Yes
Print
Print
‘B is smaller’ ‘A is smaller’

Stop

126