While Loops
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does a while loop repeat as long as its condition is true?
2. Must 'while' be written in lowercase?
3. Does a while loop's condition need to be in parentheses?
4. Can forgetting to update a variable cause an infinite loop?
5. Does a while loop's code block use curly braces?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1while (count <= 3) { ... } | AWrong - use a comparison operator, not = for assignment | |
| 2while (isRunning) { ... } | BInfinite loop | |
| 3Updates a variable so the loop eventually stops | Ccount = count + 1; | |
| 4Runs forever because the condition never becomes false | DWrong - the condition needs parentheses | |
| 5while n > 0 { n = n - 1; } | ERepeats the block while isRunning stays true | |
| 6while (z = 3) { z = z + 1; } | FRepeats the block while count is 3 or less |
C
Definitions
while
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
_____ (count <= 3) {
2.
while (count __ 3) {
3.
while (n > 0) {
n = n _ 1;
}
4.
_____ (isRunning) {
5.
while (i < 5) {
i = i _ 1;
}
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
let count = 1;
B
Wile (count <= 3) {
C
count = count + 1;
Question 2
A
while n > 0 {
B
let n = 5;
C
n = n - 1;
Question 3
A
let i = 0;
B
while (i < 5) {
C
console.log(i)
Question 4
A
let x = 10;
B
while (x > 0) [
C
x = x - 1;
Question 5
A
let y = 1;
B
while (y <= 5) {
C
y = y + 1;
D
]
Answer Key
While Loops
Section A: Quick Questions
Q1
A — Yes
Q2
B — Yes
Q3
A — Yes
Q4
A — Yes
Q5
B — Yes
Section B: Match the Pairs
Q1
while (count <= 3) { ... } → Repeats the block while count is 3 or less
Q2
while (isRunning) { ... } → Repeats the block while isRunning stays true
Q3
Updates a variable so the loop eventually stops → count = count + 1;
Q4
Runs forever because the condition never becomes false → Infinite loop
Q5
while n > 0 { n = n - 1; } → Wrong - the condition needs parentheses
Q6
while (z = 3) { z = z + 1; } → Wrong - use a comparison operator, not = for assignment
Section C: Definitions
Q1
while — Repeats a block of code as long as its condition inside parentheses stays true.Section D: Fill in the Blanks
Q1
while (count <= 3) {Q2
while (count <= 3) {Q3
while (n > 0) {
n = n - 1;
}Q4
while (isRunning) {Q5
while (i < 5) {
i = i + 1;
}Section E: Spot the Error
Q1
B — 'while' is misspelled as 'Wile'.
Q2
A — The condition needs parentheses: while (n > 0).
Q3
C — This line is missing a semicolon, but that's not required in JS.
Q4
B — Code blocks use curly braces {}, not square brackets [].
Q5
D — The block must close with }, not ].