Repeat loop with break in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a repeat loop in R?

A repeat loop in R runs the code inside it indefinitely until a break statement stops it.

beginner

How do you stop a repeat loop in R?

You stop a repeat loop by using the break statement inside the loop when a condition is met.

beginner

What happens if you forget to use break in a repeat loop?

The loop will run forever, causing your program to freeze or crash because it never stops.

beginner

Example: What does this code do?<br>

i <- 1<br>repeat {<br>  print(i)<br>  if (i == 3) break<br>  i <- i + 1<br>}

This code prints numbers 1, 2, and 3. It stops the loop when i equals 3 using break.

intermediate

Why use a repeat loop instead of a for or while loop?

Use repeat when you want to keep looping until a condition inside the loop tells it to stop, without specifying the number of iterations upfront.

What keyword stops a repeat loop in R?

A end

B stop

C break

D exit

The break keyword immediately stops the loop.

What happens if a repeat loop has no break?

A It throws an error

B It runs forever

C It runs once

D It skips the loop

Without break, the repeat loop never stops and runs forever.

Which of these is a correct way to stop a repeat loop when i equals 5?

A if (i == 5) break

B if (i = 5) stop

C if (i == 5) exit

D if (i == 5) end

The correct syntax to stop the loop is if (i == 5) break.

What will this code print?<br>

i <- 1<br>repeat {<br>  print(i)<br>  if (i >= 2) break<br>  i <- i + 1<br>}

A 1, 2, and 3

B Only 1

C Only 2

D 1 and 2

It prints 1 first, then 2, then stops because i >= 2 becomes true.

Why might you choose a repeat loop over a while loop?

A When you want to check the stop condition inside the loop body

B When you know the number of iterations in advance

C When you want to run the loop exactly once

D When you want to avoid using <code>break</code>

A repeat loop runs indefinitely until a break inside the loop stops it, so you check the stop condition inside the loop body.

Explain how a repeat loop works in R and how you stop it.

Think about what happens if you never use break.

Write a simple example of a repeat loop that prints numbers 1 to 4 and then stops.

Use a variable to count and break when it reaches 4.