Switch statement execution in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to execute the correct case in the switch statement.

C Sharp (C#)

int number = 2;
switch (number) {
    case 1:
        Console.WriteLine("One");
        break;
    case [1]:
        Console.WriteLine("Two");
        break;
    default:
        Console.WriteLine("Other");
        break;
}

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

A3

B2

C0

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a case label that does not match the variable value.

Forgetting to include the break statement.

The switch statement matches the value of number with the case labels. Since number is 2, the case label must be 2 to execute that block.

2fill in blank

medium

Complete the code to print the correct message for the given day number.

C Sharp (C#)

int day = 5;
switch (day) {
    case 1:
        Console.WriteLine("Monday");
        break;
    case 5:
        Console.WriteLine("[1]");
        break;
    default:
        Console.WriteLine("Invalid day");
        break;
}

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

ASunday

BSaturday

CWednesday

DFriday

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing the day number with the wrong weekday name.

Not matching the case value with the variable.

When day is 5, the switch case for 5 runs, which should print "Friday".

3fill in blank

hard

Fix the error in the switch statement to correctly handle the input character.

C Sharp (C#)

char grade = 'B';
switch (grade) {
    case 'A':
        Console.WriteLine("Excellent");
        break;
    case [1]:
        Console.WriteLine("Good");
        break;
    default:
        Console.WriteLine("Needs Improvement");
        break;
}

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

A'B'

B"B"

CB

D"b"

Attempts:

3 left

💡 Hint

Common Mistakes

Using double quotes instead of single quotes for characters.

Not quoting the character at all.

In C#, character literals must be enclosed in single quotes. Using double quotes or no quotes causes errors.

4fill in blank

hard

Fill both blanks to complete the switch statement that prints the season based on the month number.

C Sharp (C#)

int month = 3;
switch (month) {
    case [1]:
    case 4:
    case 5:
        Console.WriteLine("Spring");
        break;
    case [2]:
    case 7:
    case 8:
        Console.WriteLine("Summer");
        break;
    default:
        Console.WriteLine("Other season");
        break;
}

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

A3

B6

C9

D12

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up month numbers for seasons.

Not using the correct case labels.

Months 3, 4, 5 are spring; months 6, 7, 8 are summer. So blanks should be 3 and 6 respectively.

5fill in blank

hard

Fill all three blanks to create a switch statement that prints the type of day based on the day number.

C Sharp (C#)

int day = 7;
switch (day) {
    case [1]:
    case 7:
        Console.WriteLine("Weekend");
        break;
    case [2]:
    case [3]:
    case 5:
        Console.WriteLine("Weekday");
        break;
    default:
        Console.WriteLine("Invalid day");
        break;
}

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

A6

B1

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing weekend and weekday day numbers.

Not including all necessary case labels.

Days 6 and 7 are weekend; days 1, 2, and 5 are weekdays. The blanks correspond to 6, 1, and 2.

Practice

1.

What is the main purpose of a switch statement in C#?

easy

A. To repeat a block of code multiple times

B. To execute different code blocks based on the value of a variable

C. To define a function

D. To declare variables

Solution

1. Step 1: Understand the role of switch

   A switch statement selects one of many code blocks to execute based on a variable's value.

2. Step 2: Compare with other options

   Loops repeat code, functions define reusable code, and variable declarations create variables, none of which match switch's purpose.

3. Final Answer:

   To execute different code blocks based on the value of a variable -> Option B

4. Quick Check:

   Switch chooses code by value = A [OK]

Hint: Switch chooses code based on variable value [OK]

Common Mistakes:

• Confusing switch with loops
• Thinking switch defines functions
• Believing switch declares variables

2.

Which of the following is the correct syntax to start a switch statement in C#?

?

easy

A. switch (variable) { case 1: break; }

B. switch variable { case 1: break; }

C. switch (variable) case 1: break;

D. switch { variable case 1: break; }

Solution

1. Step 1: Recall switch syntax

   The correct syntax uses parentheses around the variable and braces around cases: switch (variable) { ... }

2. Step 2: Check each option

   switch (variable) { case 1: break; } matches correct syntax; others miss parentheses or braces or have wrong order.

3. Final Answer:

   switch (variable) { case 1: break; } -> Option A

4. Quick Check:

   Parentheses and braces required = C [OK]

Hint: Switch needs (variable) and { cases } syntax [OK]

Common Mistakes:

• Omitting parentheses around variable
• Missing braces around cases
• Incorrect order of keywords

3.

What will be the output of this C# code?

int day = 3;
switch (day) {
  case 1:
    Console.WriteLine("Monday");
    break;
  case 2:
    Console.WriteLine("Tuesday");
    break;
  case 3:
    Console.WriteLine("Wednesday");
    break;
  default:
    Console.WriteLine("Invalid day");
    break;
}

medium

A. Wednesday

B. Monday

C. Tuesday

D. Invalid day

Solution

1. Step 1: Identify the switch variable value

   The variable day is 3.

2. Step 2: Match case with variable

   Case 3 matches, so it prints "Wednesday" and then breaks.

3. Final Answer:

   Wednesday -> Option A

4. Quick Check:

   day=3 prints Wednesday [OK]

Hint: Match variable value to case label [OK]

Common Mistakes:

• Forgetting break causes fall-through
• Choosing default when case matches
• Mixing case numbers and output

4.

Find the error in this switch statement and select the fix:

int number = 2;
switch (number) {
  case 1:
    Console.WriteLine("One");
  case 2:
    Console.WriteLine("Two");
  default:
    Console.WriteLine("Default");
}

medium

A. Add semicolon after switch statement

B. Remove the default case

C. Change switch to if

D. Add break; after each case block

Solution

1. Step 1: Identify missing break statements

   Each case lacks a break, causing fall-through to next cases.

2. Step 2: Fix by adding breaks

   Adding break after each case stops fall-through and executes only matched case.

3. Final Answer:

   Add break; after each case block -> Option D

4. Quick Check:

   Break stops fall-through = A [OK]

Hint: Add break to stop fall-through in switch [OK]

Common Mistakes:

• Ignoring fall-through behavior
• Removing default case unnecessarily
• Misusing if instead of switch

5.

Given this code, what will be printed?

int score = 85;
switch (score / 10) {
  case 10:
  case 9:
    Console.WriteLine("Excellent");
    break;
  case 8:
    Console.WriteLine("Good");
    break;
  case 7:
  case 6:
    Console.WriteLine("Pass");
    break;
  default:
    Console.WriteLine("Fail");
    break;
}

hard

A. Excellent

B. Fail

C. Good

D. Pass

Solution

1. Step 1: Calculate switch expression value

   score is 85, so score / 10 is 8 (integer division).

2. Step 2: Match case for value 8

   Case 8 prints "Good" and breaks.

3. Final Answer:

   Good -> Option C

4. Quick Check:

   85/10=8 prints Good [OK]

Hint: Divide score by 10, match case labels [OK]

Common Mistakes:

• Not using integer division
• Missing combined cases for 9 and 10
• Choosing default incorrectly