Comparison operators

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which operator means 'not equal to' in Cambridge pseudocode?

A !=

B <>

2. Mark ← 50. What does the condition Mark >= 50 give?

A TRUE

B FALSE

3. Mark ← 50. What does the condition Mark > 50 give?

A FALSE

B TRUE

4. Which line correctly tests whether Age is equal to 16 in a condition?

A IF Age == 16 THEN

B IF Age = 16 THEN

5. What type of value does a comparison such as Score < 40 give?

A TRUE or FALSE

B A number

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Score <> 0		AIF Password = "abc123" THEN
2Age >= 16		BTRUE when Age is 16 or more, including exactly 16
3A single = in a condition tests whether two values are equal and gives TRUE or FALSE		CIF Mark > Max THEN
4> is strictly greater than, so a value equal to the limit gives FALSE		DTRUE when Score is not equal to 0, FALSE when Score is 0
5IF Count => 10 THEN		EThe operator is written the wrong way round. It should be >= (greater than or equal to), not =>.
6IF Number != 5 THEN		F!= is not a pseudocode operator. 'Not equal to' is written <>.

Definitions

=, <>, <, >, <=, >=

Fill in the Blanks

Complete each line of code by filling in the missing parts.

IF Password _ "abc123" THEN OUTPUT "Welcome" ENDIF

IF Answer __ "yes" THEN OUTPUT "Try again" ENDIF

IF Age __ 16 THEN OUTPUT "Allowed" ENDIF

WHILE Lives _ 0 DO Lives ← Lives - 1 ENDWHILE

Mark ← 39 Fail ← Mark __ 39 OUTPUT Fail

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A IF Age => 18 THEN

B OUTPUT "Adult"

C ENDIF

Question 2

A Score ← 50

B Pass ← 40

C IF Score <= Pass THEN

D OUTPUT "Pass"

E ENDIF

Question 3

A INPUT Guess

B IF Guess == 7 THEN

C OUTPUT "Correct"

D ENDIF

Question 4

A INPUT Age

B Vote ← FALSE

C IF Age > 18 THEN

D Vote ← TRUE

E ENDIF

Question 5

A INPUT Name

B IF Name = Ava THEN

C OUTPUT "Hello Ava"

D ENDIF

Answer Key

Comparison operators

Section A: Quick Questions

B — <>

A — TRUE

A — FALSE

B — IF Age = 16 THEN

A — TRUE or FALSE

Section B: Match the Pairs

Score <> 0 → TRUE when Score is not equal to 0, FALSE when Score is 0

Age >= 16 → TRUE when Age is 16 or more, including exactly 16

A single = in a condition tests whether two values are equal and gives TRUE or FALSE → IF Password = "abc123" THEN

> is strictly greater than, so a value equal to the limit gives FALSE → IF Mark > Max THEN

IF Count => 10 THEN → The operator is written the wrong way round. It should be >= (greater than or equal to), not =>.

IF Number != 5 THEN → != is not a pseudocode operator. 'Not equal to' is written <>.

Section C: Definitions

=, <>, <, >, <=, >= — Comparison operators compare two values and give TRUE or FALSE. = equal, <> not equal, < less than, > greater than, <= less than or equal, >= greater than or equal.

Section D: Fill in the Blanks

IF Password = "abc123" THEN
  OUTPUT "Welcome"
ENDIF

IF Answer <> "yes" THEN
  OUTPUT "Try again"
ENDIF

IF Age >= 16 THEN
  OUTPUT "Allowed"
ENDIF

WHILE Lives > 0 DO
  Lives ← Lives - 1
ENDWHILE

Mark ← 39
Fail ← Mark <= 39
OUTPUT Fail

Section E: Spot the Error

A — The operator for 'greater than or equal to' is >=, with > first then =. => is not a valid comparison operator. It should be IF Age >= 18 THEN.

C — A score of 50 with a pass mark of 40 is a pass, so the test must be 'greater than or equal to'. <= is the wrong way round. It should be IF Score >= Pass THEN.

B — Cambridge pseudocode tests equality with a single =. == is used in some other languages but is not pseudocode. It should be IF Guess = 7 THEN.

C — A person aged exactly 18 can vote, but > 18 would give FALSE for 18. Use >= to include the boundary value. It should be IF Age >= 18 THEN.

B — Text being compared must be written in double quotes. Without them, Ava looks like a variable name. It should be IF Name = "Ava" THEN.