Totalling in Cambridge pseudocode
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which line correctly adds Number to the running total?
2. Where should Total ← 0 be placed in a totalling algorithm?
3. Which declaration is correct for a variable that stores a whole-number total?
4. What happens if you forget to set Total ← 0 before the loop?
5. Which loop correctly totals 5 numbers typed in by the user?
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 | ATotal ← 0 is inside the loop, so the total is reset to zero on every repeat and only the last number is kept. | |
| 2Total ← Total + Number | BSets the running total to zero before the loop starts | |
| 3Declare an integer variable to hold the running total | CTotal ← Number replaces the total instead of adding to it, so the earlier values are lost. | |
| 4Total every element in an array called Marks with 5 items | DFOR Index ← 1 TO 5 Total ← Total + Marks[Index] NEXT Index | |
| 5FOR Count ← 1 TO 5 INPUT Number Total ← 0 Total ← Total + Number NEXT Count | EAdds the new Number to the running total each time the loop repeats | |
| 6Total ← 0 FOR Count ← 1 TO 5 INPUT Number Total ← Number NEXT Count | FDECLARE Total : INTEGER |
C
Definitions
Total ← Total + Number
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
DECLARE Total : _______
2.
DECLARE Total : INTEGER
Total ← _
FOR Count ← 1 TO 5
3.
FOR Count ← 1 TO 5
INPUT Number
Total ← Total + ______
4.
FOR Index ← 1 TO 10
Total ← Total + Scores[_____]
NEXT Index
5.
FOR Count ← 1 TO 5
Total ← _____ + Number
NEXT Count
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
FOR Count ← 1 UNTIL 5
D
INPUT Number
E
Total ← Total + Number
F
NEXT Count
Question 2
A
DECLARE Total INTEGER
B
Total ← 0
C
FOR Count ← 1 TO 5
D
INPUT Number
E
Total ← Total + Number
F
NEXT Count
Question 3
A
DECLARE Total : STRING
B
Total ← 0
C
FOR Count ← 1 TO 4
D
INPUT Price
E
Total ← Total + Price
F
NEXT Count
Question 4
A
Total ← 0
B
FOR Index ← 1 TO 5
C
Total ← Total + Marks[Count]
D
NEXT Index
E
OUTPUT Total
Question 5
A
DECLARE Total : INTEGER
B
Total ← 1
C
FOR Count ← 1 TO 10
D
INPUT Number
E
Total ← Total + Number
F
NEXT Count
Answer Key
Totalling in Cambridge pseudocode
Section A: Quick Questions
Q1
B — Total ← Total + Number
Q2
B — Before the loop starts
Q3
A — DECLARE Total : INTEGER
Q4
A — The total may start from an unknown value, so the answer can be wrong
Q5
A — FOR Count ← 1 TO 5
INPUT Number
Total ← Total + Number
NEXT Count
Section B: Match the Pairs
Q1
Total ← 0 → Sets the running total to zero before the loop starts
Q2
Total ← Total + Number → Adds the new Number to the running total each time the loop repeats
Q3
Declare an integer variable to hold the running total → DECLARE Total : INTEGER
Q4
Total every element in an array called Marks with 5 items → FOR Index ← 1 TO 5
Total ← Total + Marks[Index]
NEXT Index
Q5
FOR Count ← 1 TO 5
INPUT Number
Total ← 0
Total ← Total + Number
NEXT Count → Total ← 0 is inside the loop, so the total is reset to zero on every repeat and only the last number is kept.
Q6
Total ← 0
FOR Count ← 1 TO 5
INPUT Number
Total ← Number
NEXT Count → Total ← Number replaces the total instead of adding to it, so the earlier values are lost.
Section C: Definitions
Q1
Total ← Total + Number — Adds each new Number to the running Total every time the loop repeats. Set Total ← 0 before the loop so the total starts from zero.Section D: Fill in the Blanks
Q1
DECLARE Total : INTEGERQ2
DECLARE Total : INTEGER
Total ← 0
FOR Count ← 1 TO 5Q3
FOR Count ← 1 TO 5
INPUT Number
Total ← Total + NumberQ4
FOR Index ← 1 TO 10
Total ← Total + Scores[Index]
NEXT IndexQ5
FOR Count ← 1 TO 5
Total ← Total + Number
NEXT CountSection E: Spot the Error
Q1
C — A FOR loop uses TO to give its end value, not UNTIL. It should be FOR Count ← 1 TO 5.
Q2
A — A DECLARE statement needs a colon between the variable name and its data type. It should be DECLARE Total : INTEGER.
Q3
A — A total is a number that is added to, so it cannot be a STRING. Prices with decimals need REAL, so it should be DECLARE Total : REAL.
Q4
C — The loop counter is Index, so the array must be read with Marks[Index]. Count does not exist in this program, so it should be Total ← Total + Marks[Index].
Q5
B — The running total must start at 0 before the loop. Starting at 1 makes the final total 1 too big. It should be Total ← 0.