if-then block

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Quick Questions

Shade in the A or B circle for each question.

1. Which keyword is required to open the body of an if block in VCAA pseudocode?

A do — written after the condition

B then — written after the condition

2. How must the body of an if-then block be formatted in VCAA pseudocode?

A Indented to show it belongs inside the block

B Left-aligned with no indentation

3. Which correctly closes an if block in VCAA pseudocode?

A endif

B end if

4. What happens when the condition in an if-then block is false?

A The block body is skipped entirely

B The block body still executes

5. Which is the correct VCAA pseudocode structure for a single-branch if block?

A if score >= 50 then print "Pass" end if

B if score >= 50: print "Pass"

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 print "Pass" end if		AAn if-then block with two body statements — both are indented inside the block and both execute only when n is not equal to zero
2if n != 0 then result <- 100 / n print result end if		BA complete if-then block: condition opens with then, the body is indented, and end if closes the block; the body runs only when score >= 50 is true
3The body of an if-then block is skipped entirely when the condition is false — execution jumps to the line after end if		CWrong — the body `print n` is not indented. The body of an if-then block must be indented to show it belongs inside the block
4end if closes the if block at the same indentation level as the opening if keyword		Dif total > 0 then print total end if print "Done"
5if age >= 18 print "Adult" end if		EWrong — the condition is missing the required `then` keyword. The correct form is `if age >= 18 then` with then after the condition
6if n > 0 then print n end if		Fif x > 0 then x <- x + 1 end if

Definitions

end if

Fill in the Blanks

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

if score >= 50 ____ print "Pass" end if

if n > 0 then print n ___ if

__ age >= 18 then print "Adult" end if

if total > 100 then discount <- total / __ end if

if x != 0 then result <- 100 / x ___ if

Spot the Error

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

Question 1

A Algorithm: flag positive

B input n

C if n > 0 then

D print "Positive"

E end if

Question 2

A Algorithm: check speed

B input speed

C if speed > 110

D print "Too fast"

E end if

Question 3

A Algorithm: check age

B input age

C if age >= 18 then

D print "Adult"

E endif

Question 4

A algorithm: check balance

B input balance

C if balance < 0 then

D print "Overdrawn"

E end if

Question 5

A Algorithm: check temp

B input temp

C if temp then > 30

D print "Hot"

E end if

Answer Key

if-then block

Section A: Quick Questions

B — then — written after the condition

A — Indented to show it belongs inside the block

B — end if

A — The block body is skipped entirely

A — if score >= 50 then print "Pass" end if

Section B: Match the Pairs

if score >= 50 then print "Pass" end if → A complete if-then block: condition opens with then, the body is indented, and end if closes the block; the body runs only when score >= 50 is true

if n != 0 then result <- 100 / n print result end if → An if-then block with two body statements — both are indented inside the block and both execute only when n is not equal to zero

The body of an if-then block is skipped entirely when the condition is false — execution jumps to the line after end if → if total > 0 then print total end if print "Done"

end if closes the if block at the same indentation level as the opening if keyword → if x > 0 then x <- x + 1 end if

if age >= 18 print "Adult" end if → Wrong — the condition is missing the required `then` keyword. The correct form is `if age >= 18 then` with then after the condition

if n > 0 then print n end if → Wrong — the body `print n` is not indented. The body of an if-then block must be indented to show it belongs inside the block

Section C: Definitions

end if — The closing keyword that ends an if-then block in VCAA pseudocode. Every if block must be closed with end if at the same indentation level as the opening if keyword

Section D: Fill in the Blanks

if score >= 50 then
    print "Pass"
end if

if n > 0 then
    print n
end if

if age >= 18 then
    print "Adult"
end if

if total > 100 then
    discount <- total / 10
end if

if x != 0 then
    result <- 100 / x
end if

Section E: Spot the Error

D — `print "Positive"` is inside the if block but is not indented. The body of an if-then block must be indented to show it belongs inside the block. The line should read ` print "Positive"` with leading spaces. Line 3 is wrong.

C — The if condition on line 2 is missing the `then` keyword. In VCAA pseudocode an if block must use the form `if condition then` — the word `then` is required to open the block body. Line 2 is wrong.

E — `endif` is written as one word, which is incorrect in VCAA pseudocode. The closing keyword must be written as two separate words: `end if` with a space between them. Line 4 is wrong.

A — The keyword `algorithm` uses a lowercase a. VCAA pseudocode requires the keyword to have a capital A: `Algorithm: check balance`. Line 0 is wrong.

C — `if temp then > 30` places `then` in the wrong position. The correct structure is `if condition then` — the condition comes before `then`. The line should read `if temp > 30 then`. Line 2 is wrong.