LENGTH: number of characters in a string
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. What does LENGTH("Happy Days") return?
2. Which data type does LENGTH return?
3. What does LENGTH("") return?
4. Which line correctly stores the length of Name in a variable?
5. Does LENGTH("Hi there") count the space?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1LENGTH("Happy Days") | AName ← "Sam Lee" OUTPUT LENGTH(Name) | |
| 2LENGTH("") | BSpaces do count as characters, so LENGTH("Hi there") is 8. Do not subtract 1 for the space. | |
| 3LENGTH gives a whole number, so its result can be stored in an INTEGER variable | CDECLARE Size : INTEGER Size ← LENGTH("Cambridge") | |
| 4LENGTH counts the characters of the string held in a variable | DThe string literal has no quotation marks. It should be LENGTH("Happy Days"). | |
| 5Size ← LENGTH(Happy Days) | EReturns 10, because the space between the words counts as a character | |
| 6OUTPUT LENGTH("Hi there") - 1 // student expects 7 because spaces do not count | FReturns 0, because an empty string has no characters |
C
Definitions
LENGTH(Text)
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
Size ← ______("Happy Days")
2.
DECLARE Total : _______
Total ← LENGTH("Happy Days")
OUTPUT Total
3.
Count ← LENGTH("")
OUTPUT Count
// Output: _
4.
Name ← "Ava Lee"
Size ← LENGTH(____)
OUTPUT Size
5.
Size _ LENGTH("Happy Days")
OUTPUT Size
// Output: 10
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
DECLARE Word : STRING
B
DECLARE Count : STRING
C
Word ← "Happy Days"
D
Count ← LENGTH(Word)
Question 2
A
DECLARE Name : STRING
B
DECLARE Size : INTEGER
C
Name ← "Happy Days"
D
Size ← LEN(Name)
Question 3
A
Word ← "Hi there"
B
Size ← LENGTH(Word)
C
OUTPUT "Characters: " Size
Question 4
A
Phrase ← "Happy Days"
B
// spaces count too
C
Size ← LENGTH(Phrase) - 1
D
OUTPUT Size
Question 5
A
Empty ← ""
B
Size ← LENGTH("Empty")
C
OUTPUT Size
Answer Key
LENGTH: number of characters in a string
Section A: Quick Questions
Q1
A — 10
Q2
B — INTEGER
Q3
A — 0
Q4
A — Size ← LENGTH(Name)
Q5
B — Yes, it returns 8
Section B: Match the Pairs
Q1
LENGTH("Happy Days") → Returns 10, because the space between the words counts as a character
Q2
LENGTH("") → Returns 0, because an empty string has no characters
Q3
LENGTH gives a whole number, so its result can be stored in an INTEGER variable → DECLARE Size : INTEGER
Size ← LENGTH("Cambridge")
Q4
LENGTH counts the characters of the string held in a variable → Name ← "Sam Lee"
OUTPUT LENGTH(Name)
Q5
Size ← LENGTH(Happy Days) → The string literal has no quotation marks. It should be LENGTH("Happy Days").
Q6
OUTPUT LENGTH("Hi there") - 1
// student expects 7 because spaces do not count → Spaces do count as characters, so LENGTH("Hi there") is 8. Do not subtract 1 for the space.
Section C: Definitions
Q1
LENGTH(Text) — Returns an INTEGER: the number of characters in the string, including spaces. LENGTH("Happy Days") returns 10 and LENGTH("") returns 0.Section D: Fill in the Blanks
Q1
Size ← LENGTH("Happy Days")Q2
DECLARE Total : INTEGER
Total ← LENGTH("Happy Days")
OUTPUT TotalQ3
Count ← LENGTH("")
OUTPUT Count
// Output: 0Q4
Name ← "Ava Lee"
Size ← LENGTH(Name)
OUTPUT SizeQ5
Size ← LENGTH("Happy Days")
OUTPUT Size
// Output: 10Section E: Spot the Error
Q1
B — LENGTH returns a whole number, so the variable that stores the result must be declared as INTEGER, not STRING.
Q2
D — The Cambridge pseudocode function is called LENGTH, not LEN. It should be Size ← LENGTH(Name).
Q3
C — Values in an OUTPUT statement must be separated by commas. It should be OUTPUT "Characters: ", Size.
Q4
C — Spaces count as characters, so LENGTH("Happy Days") is already 10. Subtracting 1 gives the wrong answer; the line should be Size ← LENGTH(Phrase).
Q5
B — The quotes turn Empty into a string literal of 5 characters. To measure the empty string stored in the variable, use LENGTH(Empty), which gives 0.