Loop execution flow in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of a loop in programming?

A loop repeats a block of code multiple times until a condition is met or no longer true.

beginner

In a for loop, what are the three main parts controlling the loop execution?

Initialization (runs once), condition (checked before each iteration), and update (runs after each iteration).

beginner

What happens if the loop condition is false at the start of a while loop?

The loop body does not run at all, and the program continues after the loop.

intermediate

How does a do-while loop differ from a while loop in execution flow?

A do-while loop runs the loop body first, then checks the condition, so it always runs at least once.

intermediate

What is the role of the break statement inside a loop?

It immediately stops the loop and exits it, skipping any remaining iterations.

Which part of a for loop runs only once at the start?

A Condition

B Initialization

C Update

D Loop body

Initialization sets up the loop variable and runs only once before the loop starts.

What happens if the condition in a while loop is false initially?

A Loop does not run at all

B Loop runs infinitely

C Loop runs once

D Loop runs twice

If the condition is false at the start, the while loop body is skipped entirely.

Which loop guarantees the body runs at least once?

A <code>for</code> loop

B None of these

C <code>while</code> loop

D <code>do-while</code> loop

The do-while loop runs the body first before checking the condition.

What does the break statement do inside a loop?

A Skips current iteration

B Restarts the loop

C Stops the loop immediately

D Does nothing

break exits the loop immediately, no further iterations run.

In a for loop, when is the update step executed?

A After each iteration

B Never

C Only once at the end

D Before the loop starts

The update step runs after each loop iteration to change the loop variable.

Explain the execution flow of a for loop in C++.

Think about the order of steps in the loop.

Describe the difference between while and do-while loops in terms of execution flow.

Focus on when the condition is checked.