The OUTPUT column of a trace table

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Quick Questions

Shade in the A or B circle for each question.

1. A program runs OUTPUT Total, and Total holds 15. What goes in the OUTPUT column?

A Total

B 15

2. The program runs OUTPUT "Score: ", Score and Score holds 8. What goes in the OUTPUT column?

A Score: 8

B 8

3. Where do you write the result of an OUTPUT statement in a trace table?

A On the row where the OUTPUT statement runs

B On the last row of the table

4. FOR Count ← 1 TO 3 contains OUTPUT Count inside the loop. How is the OUTPUT column filled in?

A 1, then 2, then 3, each on its own row

B 1 2 3 all written on the final row

5. OUTPUT "Finished" comes after the end of a loop. How often is Finished written in the OUTPUT column?

A On every row of the loop

B Once, on the row after the loop ends

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1OUTPUT "Total: ", Total		AWrites the text Total: followed by the current value of Total, together in the OUTPUT column on that row.
2FOR I ← 1 TO 3 OUTPUT I NEXT I		BFOR I ← 1 TO 3 Total ← Total + I NEXT I OUTPUT Total
3Text in quotes is part of the output, so it is copied exactly into the OUTPUT column.		CWrites 1, then 2, then 3 on three separate rows of the OUTPUT column.
4An OUTPUT placed after a loop is written once, on the row after the loop has finished.		DOUTPUT "Pass"
5OUTPUT "Score" (Score is 8, but 8 is written in the OUTPUT column)		EThe OUTPUT is inside the loop, so it happens on every repeat. Writing only the last value misses the first two outputs.
6FOR I ← 1 TO 3 OUTPUT I NEXT I (only 3 is written in the OUTPUT column)		FThe word Score is in quotes, so it is text. The OUTPUT column should show Score, not the value 8.

Definitions

OUTPUT column

Fill in the Blanks

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

Total ← 5 + 3 ______ Total

Total ← 12 OUTPUT "Total: ", _____

FOR Count ← 1 TO 3 OUTPUT _____ NEXT Count

Total ← Total + Count NEXT Count ______ "Sum: ", Total

Price ← 8 Tax ← Price ___ 2 OUTPUT "Tax: ", Tax

Spot the Error

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

Question 1

A X ← 4

B OUTPUT "X is " X

C X ← X * 2

D OUTPUT "X is ", X

Question 2

A Name ← "Sam"

B OUTPUT Hello, Name

C OUTPUT "Bye"

Question 3

A OUTPUT Start

B Count ← 3

C OUTPUT Count

Question 4

A PRINT "Pass mark: ", 50

B Mark ← 62

C OUTPUT "Mark: ", Mark

Question 5

A FOR I ← 1 TO 3

B Sq ← I * I

C OUTPUT "Sq"

D NEXT I

E OUTPUT "Done"

Answer Key

The OUTPUT column of a trace table

Section A: Quick Questions

B — 15

A — Score: 8

A — On the row where the OUTPUT statement runs

A — 1, then 2, then 3, each on its own row

B — Once, on the row after the loop ends

Section B: Match the Pairs

OUTPUT "Total: ", Total → Writes the text Total: followed by the current value of Total, together in the OUTPUT column on that row.

FOR I ← 1 TO 3 OUTPUT I NEXT I → Writes 1, then 2, then 3 on three separate rows of the OUTPUT column.

Text in quotes is part of the output, so it is copied exactly into the OUTPUT column. → OUTPUT "Pass"

An OUTPUT placed after a loop is written once, on the row after the loop has finished. → FOR I ← 1 TO 3 Total ← Total + I NEXT I OUTPUT Total

OUTPUT "Score" (Score is 8, but 8 is written in the OUTPUT column) → The word Score is in quotes, so it is text. The OUTPUT column should show Score, not the value 8.

FOR I ← 1 TO 3 OUTPUT I NEXT I (only 3 is written in the OUTPUT column) → The OUTPUT is inside the loop, so it happens on every repeat. Writing only the last value misses the first two outputs.

Section C: Definitions

OUTPUT column — The trace table column where you write each value or message shown by an OUTPUT statement, on the row where it happens. Text in quotes is copied exactly as the output.

Section D: Fill in the Blanks

Total ← 5 + 3
OUTPUT Total

Total ← 12
OUTPUT "Total: ", Total

FOR Count ← 1 TO 3
    OUTPUT Count
NEXT Count

    Total ← Total + Count
NEXT Count
OUTPUT "Sum: ", Total

Price ← 8
Tax ← Price DIV 2
OUTPUT "Tax: ", Tax

Section E: Spot the Error

B — The text and the variable must be separated by a comma. It should be OUTPUT "X is ", X so the OUTPUT column shows X is 4 on that row.

B — Text to be shown exactly must be in quotes. Without quotes, Hello would be treated as a variable. It should be OUTPUT "Hello ", Name, giving Hello Sam in the OUTPUT column.

A — Start has no quotes, so it is treated as a variable that does not exist. It should be OUTPUT "Start" so the word Start is written in the OUTPUT column.

A — Cambridge pseudocode uses OUTPUT, not PRINT. Only an OUTPUT statement puts a value in the OUTPUT column, so the line should be OUTPUT "Pass mark: ", 50.

C — Quotes make Sq literal text, so the OUTPUT column would show Sq every time. It should be OUTPUT Sq to show the values 1, 4 and 9, one on each loop row.