Array as reference type behavior in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an integer array of size 3.

C Sharp (C#)

int[] numbers = new int[[1]];

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A1

B5

C0

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero or negative numbers as array size causes errors.

Forgetting to specify the size when creating the array.

The array size is specified inside the brackets when creating a new array. Here, the size is 3.

2fill in blank

medium

Complete the code to assign the value 10 to the first element of the array.

C Sharp (C#)

numbers[[1]] = 10;

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A1

B0

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 as the first index, which causes off-by-one errors.

Using an index outside the array bounds.

Array indexes in C# start at 0, so the first element is at index 0.

3fill in blank

hard

Fix the error in the code to copy the reference of the array correctly.

C Sharp (C#)

int[] copy = [1];

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Anew int[3]

Bnumbers.Clone()

Cnumbers

Dnumbers.CopyTo()

Attempts:

3 left

💡 Hint

Common Mistakes

Using Clone() creates a shallow copy, not just a reference copy.

Using CopyTo() requires parameters and does not return an array.

Assigning one array variable to another copies the reference, so both point to the same array.

4fill in blank

hard

Fill both blanks to show that changing the copy affects the original array.

C Sharp (C#)

copy[[1]] = 20;
Console.WriteLine(numbers[[2]]);

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A1

B0

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using different indexes for copy and numbers, which shows unrelated elements.

Using an index outside the array bounds.

Since both variables reference the same array, changing one affects the other at the same index.

5fill in blank

hard

Fill all three blanks to create a new array copy and change it without affecting the original.

C Sharp (C#)

int[] newCopy = new int[numbers.Length];
Array.[1](numbers, newCopy, numbers.[2]);
newCopy[[3]] = 30;
Console.WriteLine(numbers[1]);

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ACopy

BLength

C1

DClone

Attempts:

3 left

💡 Hint

Common Mistakes

Using Clone creates a shallow copy but returns an object, not an array.

Changing the original array instead of the copy.

Using Array.Copy copies elements to a new array. Changing newCopy does not affect numbers.