Error: = used instead of ←
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which line correctly stores the value 0 in the variable Total?
2. Which condition correctly checks whether Score is equal to 5?
3. A student writes Count = 0 at the start of an algorithm to set a counter. What is the error?
4. Which line is correct for storing the result of an addition?
5. Which statement about the symbols is true?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1Total = 0 | AIF Score = 5 THEN | |
| 2Total ← 0 | BWrong: = compares, so this does not store 0 in Total. It should be Total ← 0. | |
| 3Use ← to store a value in a variable | C= is used to assign, but = only compares. The fix is Count ← Count + 1. | |
| 4Use = to compare a variable with a value in a condition | DCorrect: stores the value 0 in the variable Total. | |
| 5Count = Count + 1 | E← is used to compare, but ← only assigns. The fix is IF Score = 5 THEN. | |
| 6IF Score ← 5 THEN | FScore ← 5 |
C
Definitions
Total ← 0
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
Total _ 0
2.
IF Score _ 5 THEN
OUTPUT "Full marks"
ENDIF
3.
Price ← 10
Total _ Price * 2
OUTPUT Total
4.
DECLARE Total : INTEGER
Total _ 0
OUTPUT Total
5.
IF Answer _ "Y" THEN
Score ← Score + 1
ENDIF
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
OUTPUT Total
Question 2
A
DECLARE Score : INTEGER
B
INPUT Score
C
IF Score ← 5
D
THEN
E
OUTPUT "Full marks"
F
ENDIF
Question 3
A
DECLARE Count : INTEGER
B
Count ← 0
C
Count = Count + 1
D
OUTPUT Count
Question 4
A
DECLARE Price : REAL
B
Price = 4.5
C
OUTPUT Price
Question 5
A
Total ← 0
B
FOR Count ← 1 TO 5
C
INPUT Mark
D
Total = Total + Mark
E
NEXT Count
Answer Key
Error: = used instead of ←
Section A: Quick Questions
Q1
B — Total ← 0
Q2
A — IF Score = 5 THEN
Q3
A — = compares, so they should have used Count ← 0 to assign
Q4
A — Total ← Total + Mark
Q5
B — ← stores a value and = compares two values
Section B: Match the Pairs
Q1
Total = 0 → Wrong: = compares, so this does not store 0 in Total. It should be Total ← 0.
Q2
Total ← 0 → Correct: stores the value 0 in the variable Total.
Q3
Use ← to store a value in a variable → Score ← 5
Q4
Use = to compare a variable with a value in a condition → IF Score = 5 THEN
Q5
Count = Count + 1 → = is used to assign, but = only compares. The fix is Count ← Count + 1.
Q6
IF Score ← 5 THEN → ← is used to compare, but ← only assigns. The fix is IF Score = 5 THEN.
Section C: Definitions
Q1
Total ← 0 — Use ← to store a value, so write Total ← 0, not Total = 0. Use = only to compare, as in IF Score = 5, not IF Score ← 5. Swapping them is an error.Section D: Fill in the Blanks
Q1
Total ← 0Q2
IF Score = 5 THEN
OUTPUT "Full marks"
ENDIFQ3
Price ← 10
Total ← Price * 2
OUTPUT TotalQ4
DECLARE Total : INTEGER
Total ← 0
OUTPUT TotalQ5
IF Answer = "Y" THEN
Score ← Score + 1
ENDIFSection E: Spot the Error
Q1
B — = compares values, it does not store them. To store 0 in Total, use the assignment arrow: Total ← 0.
Q2
C — An IF condition compares values, so it needs =. ← is for assignment. The line should be IF Score = 5.
Q3
C — This line should store a new value in Count, so it needs ←, not =. Write Count ← Count + 1.
Q4
B — = compares and does not store a value. Use the assignment arrow to give Price its value: Price ← 4.5.
Q5
D — Adding Mark to the running total must be stored in Total, so it needs ←. Write Total ← Total + Mark.