Q&A – Repetition & Indefinite Loops (Primary 4 – 4CT.01)

A loop is used in algorithms to repeat steps.

• True

• False

Which loop runs forever until the program is stopped?

• Repeat 5 times

• While number < 10

• Forever loop

• Repeat until score = 100

Trace the Algorithm: Repeat 3 times OUTPUT "Hello" What will the output be?

• Hello Hello Hello

• Hello Hello

• Hello

• Hello Hello Hello

How many outputs in total?

• 4 outputs (2 × each message).

• 2 outputs (1 × each message).

• 6 outputs (3 × each message).

• 8 outputs (4 × each message).

Q5. Correct the Algorithm The program below should say “Clap” 5 times, but it only prints once: OUTPUT "Clap" How should we correct it?

• Repeat 5 times OUTPUT "Clap"

• OUTPUT "Clap" 5 times

• Repeat OUTPUT "Clap" 5 times

• OUTPUT "Clap" x 5

An indefinite loop stops automatically after 10 steps.

• True

• False

Which of these is an indefinite loop?

• Repeat 4 times → Jump

• Forever → Spin

• Repeat until ball touches wall → Move forward

• Repeat 10 times → Print “Star”

If score starts at 0, how many times will the loop run?

• 3 times

• 0 times

• 1 time

• 2 times

What is missing?

• counter = counter + 1

• counter = counter - 1

• counter = 1

• counter == counter + 1

Write a loop to make a robot walk forward forever until the STOP button is pressed.

• Forever Move forward

• Repeat 10 times Move forward

• If button pressed Move forward

• While not moving Move forward