Totalling in pseudocode
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which line should come BEFORE the loop to start a running total?
2. Which line adds each new number to the running total inside the loop?
3. Where should OUTPUT Total go in a totalling algorithm?
4. What goes wrong if Total ← 0 is missing before the loop?
5. Which placement of Total ← 0 is correct?
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 | AAdds the current value to the running total, replacing Total with the new, larger total | |
| 2Total ← Total + Value | BInitialises the running total to zero before the loop starts, so nothing is left over from earlier | |
| 3Add each number typed in by the user to the total inside a loop | CFOR Count ← 1 TO 5 INPUT Number Total ← Total + Number NEXT Count | |
| 4Show the final total only once, after the loop has finished | DTotal is assigned each array element instead of adding to itself, so it only holds the last element. It should be Total ← Total + Number[Index]. | |
| 5FOR Count ← 1 TO 5 Total ← 0 INPUT Number Total ← Total + Number NEXT Count | ENEXT Count OUTPUT Total | |
| 6FOR Index ← 1 TO 5 Total ← Number[Index] NEXT Index | FTotal is set to 0 inside the loop, so it is reset on every pass and the running total is lost. Move Total ← 0 before the loop. |
C
Definitions
Total ← Total + Value
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
Total ← _
FOR Count ← 1 TO 5
INPUT Value
2.
FOR Count ← 1 TO 5
INPUT Value
Total ← _____ + Value
3.
FOR Index ← 1 TO 5
Total ← Total + Marks[_____]
NEXT Index
4.
Total ← Total + Value
NEXT Count
______ "Total is ", Total
5.
REPEAT
INPUT Value
Total ← Total _ Value
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
DECLARE Total : INTEGER
B
Total ← 1
C
FOR N ← 1 TO 5
D
Total ← Total + N
E
NEXT N
F
OUTPUT Total
Question 2
A
Total ← 0
B
FOR N ← 1 TO 5
C
Total ← Mark[N]
D
NEXT N
E
OUTPUT Total
Question 3
A
OUTPUT "Enter 3 numbers"
B
Total = 0
C
FOR Count ← 1 TO 3
D
INPUT Value
E
Total ← Total + Value
F
NEXT Count
Question 4
A
Total ← 0
B
FOR Count ← 1 TO 5
C
INPUT Total
D
Total ← Total + Value
E
NEXT Count
F
OUTPUT Total
Question 5
A
Total ← 0
B
FOR N ← 1 TO 4
C
Total ← Total + N
D
NEXT N
E
OUTPUT Total
Answer Key
Totalling in pseudocode
Section A: Quick Questions
Q1
B — Total ← 0
Q2
A — Total ← Total + Value
Q3
A — After the loop has finished
Q4
B — Total has no proper starting value, so the final total may be wrong
Q5
A — Total ← 0
FOR Count ← 1 TO 5
INPUT Value
Total ← Total + Value
NEXT Count
Section B: Match the Pairs
Q1
Total ← 0 → Initialises the running total to zero before the loop starts, so nothing is left over from earlier
Q2
Total ← Total + Value → Adds the current value to the running total, replacing Total with the new, larger total
Q3
Add each number typed in by the user to the total inside a loop → FOR Count ← 1 TO 5
INPUT Number
Total ← Total + Number
NEXT Count
Q4
Show the final total only once, after the loop has finished → NEXT Count
OUTPUT Total
Q5
FOR Count ← 1 TO 5
Total ← 0
INPUT Number
Total ← Total + Number
NEXT Count → Total is set to 0 inside the loop, so it is reset on every pass and the running total is lost. Move Total ← 0 before the loop.
Q6
FOR Index ← 1 TO 5
Total ← Number[Index]
NEXT Index → Total is assigned each array element instead of adding to itself, so it only holds the last element. It should be Total ← Total + Number[Index].
Section C: Definitions
Q1
Total ← Total + Value — Totalling builds a running total. Set Total ← 0 before the loop, add each Value to Total inside the loop, then OUTPUT Total after the loop has finished.Section D: Fill in the Blanks
Q1
Total ← 0
FOR Count ← 1 TO 5
INPUT ValueQ2
FOR Count ← 1 TO 5
INPUT Value
Total ← Total + ValueQ3
FOR Index ← 1 TO 5
Total ← Total + Marks[Index]
NEXT IndexQ4
Total ← Total + Value
NEXT Count
OUTPUT "Total is ", TotalQ5
REPEAT
INPUT Value
Total ← Total + ValueSection E: Spot the Error
Q1
B — A running total must start at 0. Starting at 1 makes every answer 1 too big. It should be Total ← 0.
Q2
C — This replaces Total each time instead of adding to it. It should be Total ← Total + Mark[N].
Q3
B — Assignment uses ←, not =. It should be Total ← 0.
Q4
C — INPUT Total overwrites the running total with the user's number. The loop should read into Value: INPUT Value.
Q5
C — This adds the index number, not the array element. It should be Total ← Total + Price[N].