Break statement behavior in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to exit the loop when the number is 5.

C Sharp (C#)

for (int i = 0; i < 10; i++) {
    if (i == [1]) {
        break;
    }
    Console.WriteLine(i);
}

Drag options to blanks, or click blank then click option'

A10

B5

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number other than 5 in the condition.

Forgetting to use the break statement.

The break statement stops the loop when i equals 5.

2fill in blank

medium

Complete the code to break out of the while loop when count reaches 3.

C Sharp (C#)

int count = 0;
while (true) {
    Console.WriteLine(count);
    count++;
    if (count == [1]) {
        break;
    }
}

Drag options to blanks, or click blank then click option'

A3

B5

C0

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong number in the condition.

Not incrementing the count variable.

The loop stops when count equals 3 due to the break statement.

3fill in blank

hard

Fix the error in the code to break the loop when the character 'q' is found.

C Sharp (C#)

char[] letters = { 'a', 'b', 'c', 'q', 'd' };
foreach (char letter in letters) {
    if (letter == [1]) {
        break;
    }
    Console.WriteLine(letter);
}

Drag options to blanks, or click blank then click option'

A"q"

B"letter"

Cq

D'q'

Attempts:

3 left

💡 Hint

Common Mistakes

Using double quotes for a character.

Using a variable name instead of a character literal.

Characters in C# use single quotes. So 'q' is correct to compare a char.

4fill in blank

hard

Fill both blanks to create a loop that breaks when the sum exceeds 10.

C Sharp (C#)

int sum = 0;
for (int i = 1; i <= 5; i++) {
    sum += i;
    if (sum [1] [2]) {
        break;
    }
}
Console.WriteLine(sum);

Drag options to blanks, or click blank then click option'

A>

B10

C<

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of >.

Using 5 instead of 10.

The loop breaks when sum is greater than 10.

5fill in blank

hard

Fill all three blanks to create a loop that breaks when the user inputs 'exit'.

C Sharp (C#)

string input;
do {
    Console.WriteLine("Type something (or 'exit' to quit):");
    input = Console.ReadLine();
    if (input [1] [2]) {
        [3];
    }
} while (true);

Drag options to blanks, or click blank then click option'

A==

B"exit"

Cbreak

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using != instead of ==.

Forgetting to use break to exit the loop.

The loop breaks when input == "exit".

Practice

1. What does the break statement do inside a loop in C#?

easy

A. It skips the current iteration and continues the loop.

B. It immediately stops the loop and exits it.

C. It pauses the loop until a condition is true.

D. It restarts the loop from the beginning.

Solution

1. Step 1: Understand the role of break in loops

   The break statement is designed to stop the nearest enclosing loop immediately when executed.

2. Step 2: Compare with other loop control statements

   Unlike continue which skips to the next iteration, break exits the loop entirely.

3. Final Answer:

   It immediately stops the loop and exits it. -> Option B

4. Quick Check:

   break stops loop immediately = A [OK]

Hint: Remember: break exits loop immediately, continue skips iteration [OK]

Common Mistakes:

• Confusing break with continue
• Thinking break pauses instead of stops
• Using break outside loops or switches

2. Which of the following is the correct syntax to use break inside a for loop in C#?

easy

A. break()

B. break{}

C. break;

D. break[]

Solution

1. Step 1: Recall the syntax of break statement

   The break statement is a keyword followed by a semicolon, no parentheses or braces.

2. Step 2: Check each option

   Only break; is valid syntax; others cause syntax errors.

3. Final Answer:

   break; -> Option C

4. Quick Check:

   Correct break syntax ends with semicolon = B [OK]

Hint: Break is a keyword followed by semicolon, no parentheses [OK]

Common Mistakes:

• Adding parentheses after break
• Using braces or brackets with break
• Omitting the semicolon

3. What is the output of the following C# code?

for (int i = 1; i <= 5; i++) {
    if (i == 3) {
        break;
    }
    Console.Write(i + " ");
}

medium

A. 1 2 3 4 5

B. 3 4 5

C. No output

D. 1 2

Solution

1. Step 1: Trace the loop iterations

   The loop starts with i=1, prints "1 ", then i=2 prints "2 ". When i=3, the if condition is true and break executes.

2. Step 2: Understand break effect

   Break stops the loop immediately, so no further numbers are printed.

3. Final Answer:

   1 2 -> Option D

4. Quick Check:

   Loop stops at i=3, output before break = C [OK]

Hint: Break stops loop before printing i=3, so output ends at 2 [OK]

Common Mistakes:

• Assuming break skips only current iteration
• Including number 3 in output
• Thinking loop continues after break

4. Identify the error in this C# code snippet:

int i = 0;
while (i < 5) {
    if (i == 3)
        break
    i++;
}

medium

A. Missing semicolon after break statement.

B. break cannot be used inside while loops.

C. Variable i is not initialized.

D. The loop condition is incorrect.

Solution

1. Step 1: Check syntax of break statement

   The break statement must end with a semicolon; here it is missing.

2. Step 2: Verify other parts

   Using break inside while loops is valid; variable i is initialized; loop condition is correct.

3. Final Answer:

   Missing semicolon after break statement. -> Option A

4. Quick Check:

   break requires semicolon = A [OK]

Hint: Always end break with semicolon inside loops [OK]

Common Mistakes:

• Thinking break is invalid in while loops
• Ignoring missing semicolon errors
• Confusing loop condition with break errors

5. Consider this nested loop code:

for (int i = 1; i <= 3; i++) {
    for (int j = 1; j <= 3; j++) {
        if (j == 2) {
            break;
        }
        Console.Write($"{i}{j} ");
    }
}

What is the output?

hard

A. 11 21 31

B. 11 21 22 31 32 33

C. 11 12 21 22 31 32

D. 11 12 13 21 22 23 31 32 33

Solution

1. Step 1: Analyze inner loop behavior with break

   For each i, inner loop j runs 1 to 3. When j==2, break stops inner loop immediately.

2. Step 2: Determine printed values

   Only when j=1 does it print i1. For j=2, break stops inner loop, so j=2 and j=3 are not printed.

3. Step 3: Combine all iterations

   For i=1, prints "11 "; i=2 prints "21 "; i=3 prints "31 ".

4. Final Answer:

   11 21 31 -> Option A

5. Quick Check:

   Break stops inner loop at j=2, only j=1 prints = D [OK]

Hint: Break stops inner loop early; only first inner iteration prints [OK]

Common Mistakes:

• Assuming break stops outer loop
• Printing values after break
• Confusing which loop break affects