IF…THEN…ENDIF (8.1b)

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Quick Questions

Shade in the A or B circle for each question.

1. Score is 62. What happens to OUTPUT "Pass" in: IF Score >= 50 THEN / OUTPUT "Pass" / ENDIF?

A It runs, because 62 >= 50 is TRUE

B It is skipped, because 62 >= 50 is FALSE

2. Score is 35. What happens to OUTPUT "Pass" in: IF Score >= 50 THEN / OUTPUT "Pass" / ENDIF?

A It is skipped and the program carries on after ENDIF

B The program stops with an error

3. Which is the correct way to close a selection in Cambridge pseudocode?

A END IF THEN

B ENDIF

4. Which layout is correct?

A IF Score >= 50 THEN (newline) indented OUTPUT "Pass" (newline) ENDIF lined up with IF

B IF Score >= 50 THEN (newline) indented OUTPUT "Pass" (newline) ENDIF indented like the OUTPUT

5. Which IF line is written correctly?

A IF Score >= 50

B IF Score >= 50 THEN

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		AStarts a selection that runs the indented lines below only when Score is 50 or more
2ENDIF		BIF Score >= 50 THEN Passed <- Passed + 1 OUTPUT "Pass" ENDIF
3When the condition is FALSE, the statements in the THEN branch are skipped and the program carries on after ENDIF		CIF Age >= 18 THEN OUTPUT "Adult" ENDIF OUTPUT "Done"
4The THEN branch can hold more than one indented statement, and all of them run only when the condition is TRUE		DCloses the IF statement and lines up directly under the IF it belongs to
5IF Score >= 50 THEN OUTPUT "Pass"		ETHEN is missing after the condition
6IF Score >= 50 OUTPUT "Pass" ENDIF		FThe ENDIF is missing, so the IF statement is never closed

Definitions

IF condition THEN ... ENDIF

Fill in the Blanks

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

__ Score >= 50 THEN OUTPUT "Pass" ENDIF

IF Score >= 50 ____ OUTPUT "Pass" ENDIF

IF Score __ 50 THEN OUTPUT "Pass" ENDIF

IF Score >= 50 THEN OUTPUT "Pass" _____

IF Score >= 50 THEN ______ "Well done" ENDIF

Spot the Error

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

Question 1

A INPUT Score

B IF Score >= 50 THEN

C OUTPUT "Pass

D ENDIF

Question 2

A IF Mark > 90 THEN

B OUTPUT "Top mark"

C ENDWHILE

Question 3

A INPUT Age

B IF Age >= 16

C OUTPUT "Can apply"

D ENDIF

Question 4

A IF Score >= 50 THEN

B OUTPUT "Pass"

C Passes = Passes + 1

D ENDIF

Question 5

A INPUT Temp

B IF Temp <- 30 THEN

C OUTPUT "Exactly 30"

D ENDIF

Answer Key

IF…THEN…ENDIF (8.1b)

Section A: Quick Questions

A — It runs, because 62 >= 50 is TRUE

A — It is skipped and the program carries on after ENDIF

B — ENDIF

A — IF Score >= 50 THEN (newline) indented OUTPUT "Pass" (newline) ENDIF lined up with IF

B — IF Score >= 50 THEN

Section B: Match the Pairs

IF Score >= 50 THEN → Starts a selection that runs the indented lines below only when Score is 50 or more

ENDIF → Closes the IF statement and lines up directly under the IF it belongs to

When the condition is FALSE, the statements in the THEN branch are skipped and the program carries on after ENDIF → IF Age >= 18 THEN OUTPUT "Adult" ENDIF OUTPUT "Done"

The THEN branch can hold more than one indented statement, and all of them run only when the condition is TRUE → IF Score >= 50 THEN Passed <- Passed + 1 OUTPUT "Pass" ENDIF

IF Score >= 50 THEN OUTPUT "Pass" → The ENDIF is missing, so the IF statement is never closed

IF Score >= 50 OUTPUT "Pass" ENDIF → THEN is missing after the condition

Section C: Definitions

IF condition THEN ... ENDIF — Runs the indented statements only when the condition is TRUE. If it is FALSE they are skipped. ENDIF closes the selection and lines up with IF.

Section D: Fill in the Blanks

IF Score >= 50 THEN
   OUTPUT "Pass"
ENDIF

IF Score >= 50 THEN
   OUTPUT "Pass"
ENDIF

IF Score >= 50 THEN
   OUTPUT "Pass"
ENDIF

IF Score >= 50 THEN
   OUTPUT "Pass"
ENDIF

IF Score >= 50 THEN
   OUTPUT "Well done"
ENDIF

Section E: Spot the Error

C — The text to output is missing its closing quotation mark. It should be ' OUTPUT "Pass"'.

C — An IF selection is closed with ENDIF, not ENDWHILE. ENDWHILE closes a WHILE loop.

B — The IF line is missing the keyword THEN after the condition. It should be 'IF Age >= 16 THEN'.

C — Assignment uses the arrow <-. A single = is a comparison in Cambridge pseudocode. It should be 'Passes <- Passes + 1'.

B — A condition compares values, so it needs the relational operator =. The arrow <- is for assignment. It should be 'IF Temp = 30 THEN'.