Relational operators: = and <>

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Date:

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Quick Questions

Shade in the A or B circle for each question.

1. Which condition checks whether Answer is equal to 5 in Cambridge pseudocode?

A IF Answer <- 5 THEN

B IF Answer = 5 THEN

2. Which line stores the value 5 in the variable Answer?

A Answer = 5

B Answer <- 5

3. Name has the value "Alex". What does Name <> "Sam" give?

A TRUE

B FALSE

4. Answer has the value 5. What does Answer <> 5 give?

A FALSE

B TRUE

5. Which symbol means 'is not equal to' in Cambridge pseudocode?

A <>

B !=

Match the Pairs

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

Left column		Right column
1Answer = 5		A<- is assignment, not a comparison. A condition should use = to test equality: IF Score = 10 THEN
2Name <> "Sam"		BTests whether Answer is equal to 5 and gives TRUE or FALSE
3Use <- (not =) when you want to store a value in a variable		CIF Colour = "red" THEN
4Use = inside an IF condition to check whether text matches exactly		DTests whether Name is not equal to the text "Sam" and gives TRUE if it is different
5IF Score <- 10 THEN		EAnswer <- 5
6IF Age != 18 THEN		FCambridge pseudocode uses <> for not equal, not !=. It should be IF Age <> 18 THEN

Definitions

= and <>

Fill in the Blanks

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

IF Answer _ 5 THEN OUTPUT "Correct" ENDIF

IF Name __ "Sam" THEN OUTPUT "Not Sam" ENDIF

Answer __ 5

IF Pet _ "cat" THEN OUTPUT "Meow" ENDIF

WHILE Guess __ Answer DO INPUT Guess ENDWHILE

Spot the Error

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

Question 1

A DECLARE Answer : INTEGER

B Answer <- 5

C OUTPUT "Guess the number"

D IF Answer <- 5 THEN

E OUTPUT "Correct"

F ENDIF

Question 2

A DECLARE Name : STRING

B INPUT Name

C OUTPUT "Checking name"

D IF Name != "Sam" THEN

E OUTPUT "Not Sam"

F ENDIF

Question 3

A INPUT Answer

B IF Answer == 5 THEN

C OUTPUT "Correct"

D ENDIF

Question 4

A INPUT Name

B IF Name <> Sam THEN

C OUTPUT "Access denied"

D ENDIF

Question 5

A DECLARE Answer : INTEGER

B Answer <- 0

C WHILE Answer = 5 DO

D INPUT Answer

E ENDWHILE

Answer Key

Relational operators: = and <>

Section A: Quick Questions

B — IF Answer = 5 THEN

B — Answer <- 5

A — TRUE

A — FALSE

A — <>

Section B: Match the Pairs

Answer = 5 → Tests whether Answer is equal to 5 and gives TRUE or FALSE

Name <> "Sam" → Tests whether Name is not equal to the text "Sam" and gives TRUE if it is different

Use <- (not =) when you want to store a value in a variable → Answer <- 5

Use = inside an IF condition to check whether text matches exactly → IF Colour = "red" THEN

IF Score <- 10 THEN → <- is assignment, not a comparison. A condition should use = to test equality: IF Score = 10 THEN

IF Age != 18 THEN → Cambridge pseudocode uses <> for not equal, not !=. It should be IF Age <> 18 THEN

Section C: Definitions

= and <> — = tests whether two values are equal and <> tests whether they are not equal. Each gives TRUE or FALSE. Assignment uses <- instead, not =.

Section D: Fill in the Blanks

IF Answer = 5 THEN
   OUTPUT "Correct"
ENDIF

IF Name <> "Sam" THEN
   OUTPUT "Not Sam"
ENDIF

Answer <- 5

IF Pet = "cat" THEN
   OUTPUT "Meow"
ENDIF

WHILE Guess <> Answer DO
   INPUT Guess
ENDWHILE

Section E: Spot the Error

D — <- is assignment, not a test. A condition must use = to compare Answer with 5. It should be IF Answer = 5 THEN.

D — Cambridge pseudocode uses <> for 'not equal to', not !=. It should be IF Name <> "Sam" THEN.

B — Pseudocode uses a single = to test whether two values are equal. == belongs to other languages. It should be IF Answer = 5 THEN.

B — Text values must be in double quotes. Without them, Sam looks like a variable name. It should be IF Name <> "Sam" THEN.

C — The loop should keep asking while the answer is NOT 5. With = the condition is FALSE at the start, so the loop never runs. It should be WHILE Answer <> 5 DO.