Array methods (Sort, Reverse, IndexOf) in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to sort the array in ascending order.

C Sharp (C#)

int[] numbers = {5, 3, 8, 1};
Array.[1](numbers);

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

AIndexOf

BReverse

CSort

DFind

Attempts:

3 left

💡 Hint

Common Mistakes

Using Reverse instead of Sort will flip the array but not sort it.

IndexOf is used to find an element, not to sort.

The Array.Sort method sorts the array elements in ascending order.

2fill in blank

medium

Complete the code to reverse the order of elements in the array.

C Sharp (C#)

string[] fruits = {"apple", "banana", "cherry"};
Array.[1](fruits);

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

AReverse

BSort

CIndexOf

DClear

Attempts:

3 left

💡 Hint

Common Mistakes

Using Sort will reorder elements, not reverse them.

IndexOf is for searching, not changing order.

The Array.Reverse method reverses the order of elements in the array.

3fill in blank

hard

Fix the error in the code to find the index of the element "dog" in the array.

C Sharp (C#)

string[] animals = {"cat", "dog", "bird"};
int index = Array.[1](animals, "dog");

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

ASort

BFindIndex

CReverse

DIndexOf

Attempts:

3 left

💡 Hint

Common Mistakes

Using Sort or Reverse will not find an element's index.

FindIndex is a method for lists, not arrays.

The Array.IndexOf method returns the index of the specified element in the array.

4fill in blank

hard

Fill both blanks to sort the array and then reverse it.

C Sharp (C#)

int[] values = {4, 7, 2, 9};
Array.[1](values);
Array.[2](values);

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

ASort

BClear

CReverse

DIndexOf

Attempts:

3 left

💡 Hint

Common Mistakes

Reversing before sorting will not produce descending order.

Using Clear or IndexOf here is incorrect.

First, Sort arranges the array in ascending order. Then, Reverse flips it to descending order.

5fill in blank

hard

Fill all three blanks to find the index of "blue" in the colors array after sorting and reversing it.

C Sharp (C#)

string[] colors = {"red", "blue", "green"};
Array.[1](colors);
Array.[2](colors);
int pos = Array.[3](colors, "blue");

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

ASort

BIndexOf

CReverse

DClear

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to find the index before sorting and reversing.

Using Clear instead of Reverse or IndexOf.

First, Sort orders the array. Then, Reverse flips it. Finally, IndexOf finds the position of "blue".