Array iteration with for and foreach in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print each number in the array using a for loop.

C Sharp (C#)

int[] numbers = {1, 2, 3, 4, 5};
for (int i = 0; i < numbers.Length; i++)
{
    Console.WriteLine(numbers[i]);
}

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

A<

B>=

C<=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= causes an IndexOutOfRangeException.

Using > or >= will not enter the loop correctly.

The for loop should run while i is less than the length of the array to avoid going out of bounds.

2fill in blank

medium

Complete the code to print each word in the array using a foreach loop.

C Sharp (C#)

string[] words = {"apple", "banana", "cherry"};
foreach ([1] word in words)
{
    Console.WriteLine(word);
}

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Achar

Bint

Cstring

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using int or char causes a type mismatch error.

Using bool is incorrect because the array does not contain boolean values.

The array contains strings, so the loop variable must be of type string.

3fill in blank

hard

Fix the error in the for loop condition to avoid runtime errors.

C Sharp (C#)

double[] values = {2.5, 3.6, 4.7};
for (int index = 0; index < values.Length; index++)
{
    Console.WriteLine(values[index]);
}

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A<=

B<

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= causes the loop to run one time too many.

Using > or >= will not enter the loop properly.

The loop must run while index is less than the array length to prevent accessing invalid indexes.

4fill in blank

hard

Fill both blanks to create a dictionary with word lengths for words longer than 3 characters.

C Sharp (C#)

string[] words = {"cat", "elephant", "dog", "giraffe"};
var lengths = new Dictionary<string, int>();
foreach (var word in words)
{
    if (word.Length > 3)
    {
        lengths[word] = word.Length;
    }
}

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ALength

BCount

CLength()

DCount()

Attempts:

3 left

💡 Hint

Common Mistakes

Using Count or Count() causes errors because strings do not have these members.

Using Length() with parentheses causes a syntax error.

The property Length gives the number of characters in a string. It is used without parentheses.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase words as keys and their lengths as values for words longer than 4 characters.

C Sharp (C#)

string[] words = {"tree", "mountain", "river", "sky"};
var result = new Dictionary<string, int>();
foreach (var word in words)
{
    if (word.Length > 4)
    {
        result[word.ToUpper()] = word.Length;
    }
}

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ALength

CToUpper

DToLower

Attempts:

3 left

💡 Hint

Common Mistakes

Using Length() with parentheses causes errors.

Using ToLower() instead of ToUpper() changes the case incorrectly.

Use Length property to check word length, ToUpper() method to convert the word to uppercase, and Length property again to get the length value.