IF ... THEN ... ENDIF (7c)

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Quick Questions

Shade in the A or B circle for each question.

1. Which is the correct way to write a simple IF statement in IGCSE pseudocode?

A IF Score > 50 THEN OUTPUT "Pass" ENDIF

B IF Score > 50 THEN OUTPUT "Pass"

2. Score is 40. The code is: IF Score > 50 THEN OUTPUT "Pass" ENDIF. What happens?

A Nothing is output, because the statements are skipped

B "Pass" is output

3. Score is 70. The code is: IF Score > 50 THEN OUTPUT "Pass" ENDIF. What happens?

A "Pass" is output

B Nothing is output

4. When do the statements between THEN and ENDIF run?

A Every time the program runs

B Only when the condition is TRUE

5. What does the keyword ENDIF do?

A Stops the whole program

B Marks the end of the IF statement

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 greater than 50; otherwise nothing happens
2ENDIF		BIF Age >= 16 THEN OUTPUT "Can apply" ENDIF
3The statements between THEN and ENDIF run only when the condition is TRUE		CThe ENDIF is missing, so the IF statement is never closed and it is unclear where the IF ends
4Every IF statement must be closed with its own ENDIF		DIF Temp < 0 THEN OUTPUT "Ice" ENDIF
5IF Score > 50 THEN OUTPUT "Pass"		ETHEN is missing after the condition, so the IF line is incomplete
6IF Score > 50 OUTPUT "Pass" ENDIF		FCloses an IF statement and marks where the statements that depend on the condition end

Definitions

IF ... 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" _____

IF Score _ 50 THEN OUTPUT "Pass" ENDIF

IF Score > 50 THEN ______ "Pass" 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 Score > 50

B OUTPUT "Pass"

C ENDIF

Question 3

A IF Mark >= 40 THEN

B OUTPUT "Pass"

C ENDWHILE

D OUTPUT "Done"

Question 4

A INPUT Temp

B OUTPUT "Checking"

C IF Temp ← 30 THEN

D OUTPUT "Hot"

E ENDIF

Question 5

A INPUT Score

B IF Score > 50 THEN

C OUTPUT "Fail"

D ENDIF

Answer Key

IF ... THEN ... ENDIF (7c)

Section A: Quick Questions

A — IF Score > 50 THEN OUTPUT "Pass" ENDIF

A — Nothing is output, because the statements are skipped

A — "Pass" is output

B — Only when the condition is TRUE

B — Marks the end of the IF statement

Section B: Match the Pairs

IF Score > 50 THEN OUTPUT "Pass" ENDIF → Outputs Pass only when Score is greater than 50; otherwise nothing happens

ENDIF → Closes an IF statement and marks where the statements that depend on the condition end

The statements between THEN and ENDIF run only when the condition is TRUE → IF Age >= 16 THEN OUTPUT "Can apply" ENDIF

Every IF statement must be closed with its own ENDIF → IF Temp < 0 THEN OUTPUT "Ice" ENDIF

IF Score > 50 THEN OUTPUT "Pass" → The ENDIF is missing, so the IF statement is never closed and it is unclear where the IF ends

IF Score > 50 OUTPUT "Pass" ENDIF → THEN is missing after the condition, so the IF line is incomplete

Section C: Definitions

IF ... THEN ... ENDIF — Runs the statements between THEN and ENDIF only when the condition is TRUE. If it is FALSE, they are skipped. Every IF must be closed with ENDIF, e.g. IF Score > 50 THEN OUTPUT "Pass" ENDIF.

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 "Pass"
ENDIF

Section E: Spot the Error

C — Text to be displayed must be written as a string literal in double quotes. Without quotes, Pass looks like a variable. It should be OUTPUT "Pass".

A — The condition must be followed by THEN, which introduces the statements that run when the condition is TRUE. It should be IF Score > 50 THEN.

C — An IF statement must be closed with ENDIF. ENDWHILE closes a WHILE loop, not an IF. The line should be ENDIF.

C — A condition needs a relational operator to compare values. The arrow ← is assignment, not a comparison. It should be IF Temp > 30 THEN.

B — The wrong relational operator makes the condition TRUE for high scores, so "Fail" would be output for students who passed. It should be IF Score < 50 THEN.