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Algorithms Worksheet 3 Iteration

This document contains a pseudocode program and tasks about iteration and programming constructs. The pseudocode program uses selection and iteration constructs, printing numbers between a user-input range that are not divisible by 5 or 7. If the range is 1 to 10, it will print 4 numbers. The tasks involve writing pseudocode that inputs scores until -1 is entered, calculating the average; and using repetition to draw shapes starting from a point X using floor turtle instructions like forward, backward, turn, and repeat.

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Miguel Oubiña Sánchez
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836 views5 pages

Algorithms Worksheet 3 Iteration

This document contains a pseudocode program and tasks about iteration and programming constructs. The pseudocode program uses selection and iteration constructs, printing numbers between a user-input range that are not divisible by 5 or 7. If the range is 1 to 10, it will print 4 numbers. The tasks involve writing pseudocode that inputs scores until -1 is entered, calculating the average; and using repetition to draw shapes starting from a point X using floor turtle instructions like forward, backward, turn, and repeat.

Uploaded by

Miguel Oubiña Sánchez
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Worksheet 3 Iteration

Unit 7 Algorithm design and programming

Worksheet 3 Iteration

Task 1
1. Examine the pseudocode program given below. The function mod (a,b) gives the remainder
when integer a is divided by integer b.

(a) Which lines show an example of the ‘Sequence’ programming construct?

_____________________________________________________________________

(b) Which lines show an example of the ‘Selection’ programming construct? ___________

(c) There are two examples of iteration statements in the program. On which lines do each
of the ‘Iteration’ programming construct begin and end?
_____________________________________________________________________

_____________________________________________________________________

(d) If the user enters 1 and 10 for the first and last numbers in the range, what will be
printed out at line 15?

_____________________________________________________________________

1. OUTPUT (“This program prints selected numbers in in given range.”)


2. AnotherGo 🡨 “Yes”
3. While AnotherGo = “Yes”
4. OUTPUT (“Please enter the first number in your chosen range.”)
5. LowNumber = USERINPUT
6. OUTPUT (“Please enter the last number in your chosen range.”)
7. Input (HighNumber)
8. X🡨0
9. For Count = LowNumber to HighNumber
10. If (mod(count,5)<>0) AND (mod(count,7)<>0) then
11. OUTPUT (Count)
12. X🡨X+1
13. End If
14. Next count
15. OUTPUT (X, “numbers”)
16. OUTPUT (“Another go?”)
17. AnotherGo = USERINPUT
18. Endwhile

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Worksheet 3 Iteration
Unit 7 Algorithm design and programming

Task 2
2. Write a pseudocode algorithm which inputs numeric scores and outputs how many of them
are over 100. The end of the data is signalled by a user input of -1.

3. Write a pseudocode algorithm which inputs numeric scores and outputs the average score.
The end of the data is signalled by a user input of -1.

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Worksheet 3 Iteration
Unit 7 Algorithm design and programming

Task 3
4. A floor turtle uses these instructions.

Instruction Meaning
FORWARD d Move d cm forward
BACKWARD d Move d cm backwards
LEFT t Turn left t degrees
RIGHT t Turn right t degrees
REPEAT n Repeat the next set of instructions n times
ENDREPEAT End of REPEAT loop
PENUP Raise the pen
PENDOWN Lower the pen

(Each square in the drawing is 10cm by 10cm)

(a) Complete the set of instructions to draw the shape shown below in bold lines, starting at
the point marked X.

PENDOWN
REPEAT 4

(b) Complete the set of instructions to draw the shape shown below in bold lines, starting at the
point marked X.
3
Worksheet 3 Iteration
Unit 7 Algorithm design and programming

PENDOWN
REPEAT 3
REPEAT 4

(c) Complete the set of instructions to draw the shape shown below in bold lines, starting
at the point marked X.

PENDOWN
distance 10
REPEAT 7

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Worksheet 3 Iteration
Unit 7 Algorithm design and programming

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