Parsing input to numeric types in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to parse the input string to an integer.

C Sharp (C#)

string input = Console.ReadLine();
int number = int.Parse([1]);

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

Anumber

BConsole.ReadLine()

Cinput

DConvert.ToInt32(input)

Attempts:

3 left

💡 Hint

Common Mistakes

Using Console.ReadLine() directly inside int.Parse again causes double reading.

Trying to parse the variable number before it is assigned.

The int.Parse method converts the string input to an integer.

2fill in blank

medium

Complete the code to safely parse the input string to an integer using TryParse.

C Sharp (C#)

string input = Console.ReadLine();
if (int.TryParse([1], out int result))
{
    Console.WriteLine($"Parsed number: {result}");
}

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

Ainput

Bnumber

CConsole.ReadLine()

Dresult

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the output variable result instead of the input string.

Calling Console.ReadLine() again inside TryParse.

int.TryParse tries to convert the string input to an integer safely.

3fill in blank

hard

Fix the error in the code to parse a double from input.

C Sharp (C#)

string input = Console.ReadLine();
double value = double.Parse([1]);

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

Avalue

Binput

CConsole.ReadLine()

Ddouble.TryParse(input, out value)

Attempts:

3 left

💡 Hint

Common Mistakes

Using the variable value before assignment.

Trying to use double.TryParse inside Parse.

The double.Parse method requires the string input variable to convert.

4fill in blank

hard

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

C Sharp (C#)

string[] words = { "apple", "cat", "banana", "dog" };
var lengths = new Dictionary<string, int> { { [1], [2] } };

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

A"apple"

B"cat"

C5

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using numbers as keys or strings as values incorrectly.

Mixing up the order of key and value.

The dictionary needs a key (word) and a value (length). Here, "apple" and 5 are an example pair.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension with condition on word length.

C Sharp (C#)

string[] words = { "apple", "cat", "banana", "dog" };
var lengths = words.Where(w => w.Length > [1])
    .ToDictionary([2] => [3]);

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

A2

Bw

Cw.Length

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong number in the condition.

Swapping key and value in the dictionary.

The condition filters words longer than 3 letters. The dictionary uses the word as key and its length as value.