Loop Control: break and continue

In Plain English

Fine-grained loop control gives you power over execution flow. break terminates the loop immediately and jumps past its closing brace. continue skips the rest of the current cycle and jumps directly to the next iteration.

The Mental Model

"Searching through a box for your lost keys: As soon as your hand grabs the keys, you shout "Found them!" and stop searching (break). If you pick up a piece of junk mail, you drop it and instantly grab the next item (continue)."

Deep Dive: How It Works

break: Halts the loop immediately. Crucial for search algorithms once the target is found to avoid wasting CPU cycles.

continue: Skips the remaining code inside the loop body for this cycle only; loop advances to the next iteration.

Nested Loops: break only breaks out of the innermost loop containing it.

Syntax Blueprint

for (int i = 0; i < 10; i++) {
  if (i % 2 != 0) continue; // Skip odds
  if (i == 6) break;        // Stop at 6
  Console.WriteLine(i);
}

continue skips to next cycle; break terminates the entire loop.

Core Rules to Remember

break Stops Everything: Instantly exits the loop body.

continue Skips Cycle: Bypasses remaining code in this specific cycle.

Search Efficiency: Saves valuable CPU cycles when searching collections.

Common Beginner Traps & How to Fix Them

Mistake:Using continue in a while loop after the counter increment

Why it happens: If continue skips before i++, i never increments, causing an infinite loop.

How to fix: Ensure loop counter increments before continue in while loops.

Pro Tip: Use break early in search routines to keep your code fast and responsive!

Live Interactive Example

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Searching and Filtering Elements

C# 12 / .NET

Output Console

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How it works: Odd numbers are skipped with continue, and the loop stops at 4 with break.

Your Turn: Micro Challenge

No pressure! Edit the starter code below and test your solution with instant feedback.

Micro Exercise

Stop loop at 3

Write a for loop from int i = 1 to 5.
If i == 3, print "Found 3" and break the loop.

Sandbox Output

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Deep Dive: How It Works

break: Halts the loop immediately. Crucial for search algorithms once the target is found to avoid wasting CPU cycles.

continue: Skips the remaining code inside the loop body for this cycle only; loop advances to the next iteration.

Nested Loops: break only breaks out of the innermost loop containing it.