Do–while loop in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a do–while loop in C++?

A do–while loop is a control flow statement that executes a block of code at least once and then repeats the loop as long as a specified condition is true.

beginner

How does a do–while loop differ from a while loop?

A do–while loop runs the code block first, then checks the condition. A while loop checks the condition first before running the code block. So, do–while always runs at least once.

beginner

Write the basic syntax of a do–while loop in C++.

do { // code to run } while (condition);

intermediate

Why is the semicolon required after the while(condition) in a do–while loop?

The semicolon marks the end of the do–while statement. It is required because the do–while loop is a single statement that includes the condition check after the block.

beginner

What will happen if the condition in a do–while loop is initially false?

The code inside the do block will still run once before the condition is checked and the loop stops.

What is guaranteed when using a do–while loop?

A The loop body runs at least once

B The loop body may not run at all

C The condition is checked before the loop runs

D The loop runs infinitely

A do–while loop always runs the code block once before checking the condition.

Where is the condition checked in a do–while loop?

A At the start of the program

B Before the loop body

C After the loop body

D It is never checked

In a do–while loop, the condition is checked after the loop body executes.

Which of the following is the correct syntax for a do–while loop in C++?

A while (condition) { /* code */ }

B while { /* code */ } do (condition);

C do (condition) { /* code */ }

D do { /* code */ } while (condition);

The correct syntax is do { /* code */ } while (condition); with a semicolon at the end.

What happens if the condition in a do–while loop is false after the first run?

A The loop stops after one iteration

B The loop runs again

C The program crashes

D The loop skips the first run

If the condition is false after the first run, the loop stops.

Why might you choose a do–while loop over a while loop?

A To avoid checking conditions

B To ensure the code runs at least once

C To run the loop zero times

D To run the loop infinitely

A do–while loop is used when you want the code to run at least once regardless of the condition.

Explain how a do–while loop works and when you would use it.

Think about the order of execution and condition checking.

Write a simple do–while loop in C++ that prints numbers 1 to 3.

Start with a counter variable and loop until it reaches 3.