Char type and Unicode behavior in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a char variable with the letter 'A'.

C Sharp (C#)

char letter = '[1]';

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A'A'

B"A"

CA

D'AA'

Attempts:

3 left

💡 Hint

Common Mistakes

Using double quotes instead of single quotes.

Trying to assign multiple characters to a char.

In C#, a char is a single character enclosed in single quotes.

2fill in blank

medium

Complete the code to get the Unicode code point of the char 'Ω'.

C Sharp (C#)

int codePoint = (int) '[1]';

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A"Ω"

B'Ω'

CΩ

D'O'

Attempts:

3 left

💡 Hint

Common Mistakes

Using double quotes which represent strings.

Not casting to int before assignment.

Cast the char 'Ω' (in single quotes) to int to get its Unicode code point.

3fill in blank

hard

Fix the error in the code to correctly check if a char is a digit.

C Sharp (C#)

bool isDigit = char.[1]('5');

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AIsLetter

BIsSymbol

CIsNumber

DIsDigit

Attempts:

3 left

💡 Hint

Common Mistakes

Using IsLetter which checks letters, not digits.

Using IsNumber which includes other numeric characters.

The method char.IsDigit checks if a character is a digit.

4fill in blank

hard

Fill both blanks to create a dictionary mapping characters to their Unicode code points for letters only.

C Sharp (C#)

var unicodeMap = new Dictionary<char, int> { { '[1]', (int)'A' }, { '[2]', (int)'Z' } };

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AA

BZ

Ca

Dz

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase letters when uppercase is expected.

Using strings instead of chars as keys.

The dictionary keys are chars 'A' and 'Z' representing uppercase letters.

5fill in blank

hard

Fill all three blanks to create a method that returns true if a char is a letter and uppercase.

C Sharp (C#)

bool IsUpperLetter(char c) {
    return char.[1](c) && char.[2](c) && c [3] 'A';
}

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

AIsLetter

BIsUpper

C>=

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using IsLower instead of IsUpper.

Using wrong comparison operators like '<='.

The method checks if c is a letter, is uppercase, and is greater or equal to 'A'.