Comments with // (7a)
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which line is a correct Cambridge pseudocode comment?
2. What does the computer do with the text after // on a line?
3. Which is the correct way to put a short comment at the end of a line?
4. A comment is placed on its own line above this code. Which is correct?
5. A comment needs two lines. Which 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 | |
|---|---|---|
| 1// Calculate the average mark | AA short comment at the end of a line, explaining only that line of code | |
| 2Total ← Total + Mark // add to total | B// Check if the password is long enough // Passwords must have 8 or more characters | |
| 3A comment that explains the purpose of the code is written on its own line above it | CThe comment starts with only one slash. A comment needs two forward slashes //, so the first line is not a valid comment. | |
| 4A multi-line comment needs // at the start of every line | D// Ask the user for their age INPUT Age | |
| 5/ Total of all the marks Total ← 0 | EOnly the first two lines are comments, but a long comment that runs over several lines needs // on every line. A comment line without // would be treated as code. | |
| 6// Read the number // of students INPUT Students OUTPUT Students | FA comment on its own line above the code, explaining what the next lines do |
C
Definitions
//
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
__ Ask the user for their age
INPUT Age
2.
Total ← 0 __ Start the total at zero
3.
// Calculate the area of the rectangle
__ Width and Length must be positive
Area ← Width * Length
4.
FOR Count ← 1 TO 5 __ Repeat five times
OUTPUT Count
NEXT Count
5.
__ Check if the student has passed
IF Mark >= 50 THEN
OUTPUT "Pass"
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
DECLARE Width : INTEGER
B
DECLARE Area : INTEGER
C
INPUT Width
D
Area ← Width * Width # square
E
OUTPUT Area
Question 2
A
// Total of two marks
B
Total ← Mark1 + Mark2 / add them
C
OUTPUT Total
Question 3
A
// This program checks age
B
and prints a message
C
INPUT Age
D
IF Age >= 18 THEN
E
OUTPUT "Adult"
F
ENDIF
Question 4
A
-- Ask for the user's name
B
INPUT Name
C
OUTPUT "Hello ", Name
Question 5
A
DECLARE Count : INTEGER
B
Count ← 0
C
// add one Count ← Count + 1
D
OUTPUT Count
Answer Key
Comments with // (7a)
Section A: Quick Questions
Q1
A — // Add the two marks together
Q2
A — It ignores it
Q3
B — Total ← Total + Mark // add mark
Q4
A — // Ask for the user's age
INPUT Age
Q5
B — // Check the password
// before logging in
Section B: Match the Pairs
Q1
// Calculate the average mark → A comment on its own line above the code, explaining what the next lines do
Q2
Total ← Total + Mark // add to total → A short comment at the end of a line, explaining only that line of code
Q3
A comment that explains the purpose of the code is written on its own line above it → // Ask the user for their age
INPUT Age
Q4
A multi-line comment needs // at the start of every line → // Check if the password is long enough
// Passwords must have 8 or more characters
Q5
/ Total of all the marks
Total ← 0 → The comment starts with only one slash. A comment needs two forward slashes //, so the first line is not a valid comment.
Q6
// Read the number
// of students
INPUT Students
OUTPUT Students → Only the first two lines are comments, but a long comment that runs over several lines needs // on every line. A comment line without // would be treated as code.
Section C: Definitions
Q1
// — Two forward slashes start a comment. Everything after // to the end of the line is ignored by the computer and only explains the code to the reader.Section D: Fill in the Blanks
Q1
// Ask the user for their age
INPUT AgeQ2
Total ← 0 // Start the total at zeroQ3
// Calculate the area of the rectangle
// Width and Length must be positive
Area ← Width * LengthQ4
FOR Count ← 1 TO 5 // Repeat five times
OUTPUT Count
NEXT CountQ5
// Check if the student has passed
IF Mark >= 50 THEN
OUTPUT "Pass"Section E: Spot the Error
Q1
D — Cambridge pseudocode comments start with //, not #. The line should be: Area ← Width * Width // square
Q2
B — A comment needs two forward slashes. A single / is the division operator, so the line should end with // add them.
Q3
B — Each line of a multi-line comment must start with //. Line 2 should be: // and prints a message
Q4
A — -- is not the comment marker in Cambridge pseudocode. A comment above the code must start with //: // Ask for the user's name
Q5
C — Everything after // is ignored, so the code here would be ignored too. The code must come first and the comment after it: Count ← Count + 1 // add one