Assignment with <-
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which line stores the value 0 in the variable Count?
2. After the line Score <- 10 + 5, what is stored in Score?
3. Which statement ADDS Number to the running total?
4. Count is 3. After Count <- 7 runs, what does Count hold?
5. What does the <- operator do in Count <- 0?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1Count ← 0 | AThe value and the variable are the wrong way round. The variable must be on the left of ← and the value on the right. | |
| 2Total ← Total + Number | BArea ← Length * Width | |
| 3Assigning the result of a calculation: the right side is worked out, then stored in the variable on the left | CStores the constant 0 in the variable Count, so Count starts at 0 | |
| 4Reassigning a variable: a new value replaces the old value that was stored before | DAdds Number to the current Total and stores the new result back in Total | |
| 510 ← Count | E= is used instead of ←. In Cambridge pseudocode = tests whether two values are equal, it does not store a value. | |
| 6Count = 0 | FScore ← 10 Score ← 15 |
C
Definitions
Count <- 0
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
Count __ 0
2.
Total <- Total _ Number
3.
Area <- Length _ Width
4.
Score <- 10
_____ <- Score + 5
5.
Lives <- 3
Lives <- Lives _ 1
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
DECLARE Total : INTEGER
B
Total <- 0
C
INPUT Number
D
Total = Total + Number
E
OUTPUT Total
Question 2
A
0 <- Count
B
Count <- Count + 1
C
OUTPUT Count
Question 3
A
DECLARE Price : REAL
B
Price <- 4.50
C
Price * 3 <- Cost
D
OUTPUT Cost
Question 4
A
DECLARE Score : INTEGER
B
Score <= 10
C
Score <- Score + 5
D
OUTPUT Score
Question 5
A
Lives -> 3
B
Lives <- Lives - 1
C
OUTPUT Lives
Answer Key
Assignment with <-
Section A: Quick Questions
Q1
A — Count <- 0
Q2
B — 15
Q3
B — Total <- Total + Number
Q4
A — 7
Q5
A — It stores 0 in Count
Section B: Match the Pairs
Q1
Count ← 0 → Stores the constant 0 in the variable Count, so Count starts at 0
Q2
Total ← Total + Number → Adds Number to the current Total and stores the new result back in Total
Q3
Assigning the result of a calculation: the right side is worked out, then stored in the variable on the left → Area ← Length * Width
Q4
Reassigning a variable: a new value replaces the old value that was stored before → Score ← 10
Score ← 15
Q5
10 ← Count → The value and the variable are the wrong way round. The variable must be on the left of ← and the value on the right.
Q6
Count = 0 → = is used instead of ←. In Cambridge pseudocode = tests whether two values are equal, it does not store a value.
Section C: Definitions
Q1
Count <- 0 — The <- operator stores the value on its right in the variable on its left. Count <- 0 puts 0 into Count. It is assignment, not a test for equality.Section D: Fill in the Blanks
Q1
Count <- 0Q2
Total <- Total + NumberQ3
Area <- Length * WidthQ4
Score <- 10
Score <- Score + 5Q5
Lives <- 3
Lives <- Lives - 1Section E: Spot the Error
Q1
D — Assignment uses the <- operator, not =. In Cambridge pseudocode = is a comparison, so the line should be Total <- Total + Number.
Q2
A — The value goes on the right of <- and the variable on the left. The line should be Count <- 0.
Q3
C — The variable being assigned must be on the left of <-. The calculation goes on the right: Cost <- Price * 3.
Q4
B — <= means less than or equal to. It is a comparison and does not store anything. Assignment needs the arrow: Score <- 10.
Q5
A — The assignment arrow points left, towards the variable receiving the value. The line should be Lives <- 3.