IF…THEN…ENDIF (7d)

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Quick Questions

Shade in the A or B circle for each question.

1. Which line must close every IF statement in Cambridge pseudocode?

A ENDIF

B END

2. Score ← 40. IF Score > 50 THEN OUTPUT "Pass" ENDIF. What is output?

A Pass

B Nothing is output

3. Which IF statement is written correctly?

A IF Age >= 18 THEN OUTPUT "Adult"

B IF Age >= 18 THEN OUTPUT "Adult" ENDIF

4. Temp ← 35. IF Temp > 30 THEN OUTPUT "Hot" ENDIF. What is output?

A Hot

B Nothing is output

5. When does the code between THEN and ENDIF run?

A Only when the condition is TRUE

B Every time, whatever the condition is

Match the Pairs

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

Left column		Right column
1IF Score >= 50 THEN OUTPUT "Pass" ENDIF		AOutputs Pass only when Score is 50 or more; if Score is lower, the OUTPUT line is skipped
2ENDIF		BThe IF has no ENDIF. Every IF must be closed with ENDIF after the lines that depend on the condition.
3The lines between THEN and ENDIF are indented so it is clear which lines depend on the condition		CCloses the IF statement and marks where the conditional lines end
4When the condition is FALSE, the program skips the indented lines and carries on after ENDIF		DCount ← 0 IF Count > 5 THEN OUTPUT "Big" ENDIF OUTPUT "Done"
5IF Temp > 30 THEN OUTPUT "Hot"		EIF Age >= 18 THEN OUTPUT "Adult" ENDIF
6IF Score > 90 THEN OUTPUT "Top mark" ENDIF		FThe line between THEN and ENDIF is not indented, so it is not clear that it depends on the condition.

Definitions

IF condition THEN ... ENDIF

Fill in the Blanks

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

__ Age >= 16 THEN OUTPUT "Adult" ENDIF

IF Score > 50 ____ OUTPUT "Pass" ENDIF

IF Temp < 10 THEN OUTPUT "Cold" _____

IF Total _ 100 THEN Discount ← 10 ENDIF

IF Count > 0 THEN ______ Total / Count ENDIF

Spot the Error

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

Question 1

A IF score >= 50

B OUTPUT "Pass"

C ENDIF

Question 2

A IF temp ← 30 THEN

B OUTPUT "Exactly 30"

C ENDIF

Question 3

A total ← 0

B IF total == 0 THEN

C OUTPUT "Empty"

D ENDIF

Question 4

A INPUT age

B IF age >= 18 THEN

C OUTPUT "Adult"

D ENDWHILE

Question 5

A INPUT mark

B IF mark < 40 THEN

C PRINT "Retake"

D ENDIF

Answer Key

IF…THEN…ENDIF (7d)

Section A: Quick Questions

A — ENDIF

B — Nothing is output

B — IF Age >= 18 THEN OUTPUT "Adult" ENDIF

A — Hot

A — Only when the condition is TRUE

Section B: Match the Pairs

IF Score >= 50 THEN OUTPUT "Pass" ENDIF → Outputs Pass only when Score is 50 or more; if Score is lower, the OUTPUT line is skipped

ENDIF → Closes the IF statement and marks where the conditional lines end

The lines between THEN and ENDIF are indented so it is clear which lines depend on the condition → IF Age >= 18 THEN OUTPUT "Adult" ENDIF

When the condition is FALSE, the program skips the indented lines and carries on after ENDIF → Count ← 0 IF Count > 5 THEN OUTPUT "Big" ENDIF OUTPUT "Done"

IF Temp > 30 THEN OUTPUT "Hot" → The IF has no ENDIF. Every IF must be closed with ENDIF after the lines that depend on the condition.

IF Score > 90 THEN OUTPUT "Top mark" ENDIF → The line between THEN and ENDIF is not indented, so it is not clear that it depends on the condition.

Section C: Definitions

IF condition THEN ... ENDIF — Runs the indented lines between THEN and ENDIF only when the condition is TRUE. If it is FALSE, those lines are skipped. Every IF must be closed with its own ENDIF.

Section D: Fill in the Blanks

IF Age >= 16 THEN
  OUTPUT "Adult"
ENDIF

IF Score > 50 THEN
  OUTPUT "Pass"
ENDIF

IF Temp < 10 THEN
  OUTPUT "Cold"
ENDIF

IF Total > 100 THEN
  Discount ← 10
ENDIF

IF Count > 0 THEN
  OUTPUT Total / Count
ENDIF

Section E: Spot the Error

A — The IF line is missing the keyword THEN. The condition must be followed by THEN: IF score >= 50 THEN.

A — The ← symbol assigns a value. A condition needs a comparison operator, so it should be IF temp = 30 THEN.

B — Cambridge pseudocode compares with a single =, not ==. The line should be IF total = 0 THEN.

D — An IF must be closed with ENDIF. ENDWHILE closes a WHILE loop, so the last line should be ENDIF.

C — Cambridge pseudocode uses OUTPUT to display a value, not PRINT. The indented line inside the IF should be OUTPUT "Retake".