Quiz - C# Mastery Hub

1 What is the correct way to declare an array of 5 integers in C#?

int[] numbers = new int[5];

int numbers[5] = new int[];

array<int> numbers = new array<int>(5);

int[] numbers = new int[]{5};

2 How do you access the third element in an array named 'scores'?

scores[2]

scores[3]

scores.Third()

scores.Item(3)

3 What does Array.Length return?

The number of elements in the array

The memory size of the array

The index of the last element

The number of dimensions

4 Which loop is best for iterating through an array when you don't need the index?

foreach

for

while

do-while

5 How do you create a new List of strings in C#?

List<string> names = new List<string>();

string[] names = new List<string>();

List<string> names = new List();

new List<string> names = new List<string>();

6 Which method adds an item to a List?

Add()

Append()

Insert()

Push()

7 What property gives you the number of items in a List?

Count

Length

Size

Items

8 What is the key difference between an array and a List?

Lists can grow dynamically, arrays have fixed size

Arrays can store more data

Lists are faster than arrays

Arrays can store different types

9 What will this code output? int x = 10; if (x > 5) { Console.Write('A'); } else { Console.Write('B'); }

A

B

AB

Nothing

10 Which operator is used for AND in C#?

&&

&

and

AND

11 What is the correct syntax for an else-if statement?

else if (condition) { }

elsif (condition) { }

elseif (condition) { }

elif (condition) { }

12 What will this code output? int age = 15; if (age >= 18) { Console.Write('Adult'); } else if (age >= 13) { Console.Write('Teen'); } else { Console.Write('Child'); }

Teen

Adult

Child

Nothing

13 What keyword is used to end a case in a switch statement?

break

exit

end

return

14 What is the default case in a switch statement?

Runs when no other case matches

Runs first

Runs last

Is optional and runs always

15 What will this code output? string color = 'Red'; switch(color) { case 'Red': Console.Write('R'); break; case 'Blue': Console.Write('B'); break; default: Console.Write('?'); break; }

R

B

?

RB

16 What does the default case do in a switch statement?

Handles all unmatched values

Handles only the first value

Exits the switch

Throws an exception

17 Which loop is best when you know exactly how many times to iterate?

for

while

do-while

foreach

18 Which loop always executes the code block at least once?

for

while

do-while

foreach

19 What does the continue statement do in a loop?

Exits the loop entirely

Skips the current iteration

Restarts the loop

Throws an exception

20 What is the difference between a for loop and a foreach loop?

for uses an index, foreach works directly with elements

foreach uses an index, for works directly with elements

They are identical

for is only for arrays, foreach is for lists

WindowsForms_Refresher Quiz

1 What is the correct way to declare an array of 5 integers in C#?

2 How do you access the third element in an array named 'scores'?

3 What does Array.Length return?

4 Which loop is best for iterating through an array when you don't need the index?

5 How do you create a new List of strings in C#?

6 Which method adds an item to a List?

7 What property gives you the number of items in a List?

8 What is the key difference between an array and a List?

9 What will this code output? int x = 10; if (x > 5) { Console.Write('A'); } else { Console.Write('B'); }

10 Which operator is used for AND in C#?

11 What is the correct syntax for an else-if statement?

12 What will this code output? int age = 15; if (age >= 18) { Console.Write('Adult'); } else if (age >= 13) { Console.Write('Teen'); } else { Console.Write('Child'); }

13 What keyword is used to end a case in a switch statement?

14 What is the default case in a switch statement?

15 What will this code output? string color = 'Red'; switch(color) { case 'Red': Console.Write('R'); break; case 'Blue': Console.Write('B'); break; default: Console.Write('?'); break; }

16 What does the default case do in a switch statement?

17 Which loop is best when you know exactly how many times to iterate?

18 Which loop always executes the code block at least once?

19 What does the continue statement do in a loop?

20 What is the difference between a for loop and a foreach loop?