Type conversion and casting in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to convert an integer to a double.

C Sharp (C#)

int number = 10;
double result = (double)[1];
Console.WriteLine(result);

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

AConvert

Bresult

C10

Dnumber

Attempts:

3 left

💡 Hint

Common Mistakes

Using the target variable name instead of the source variable.

Trying to cast a method or keyword instead of the variable.

We cast the integer variable number to a double using (double)number.

2fill in blank

medium

Complete the code to convert a string to an integer using a built-in method.

C Sharp (C#)

string text = "123";
int number = [1](text);
Console.WriteLine(number);

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

AParse

BToString

CConvert.ToDouble

DToInt32

Attempts:

3 left

💡 Hint

Common Mistakes

Using ToString which converts to string, not integer.

Using Convert.ToDouble which converts to double, not int.

The int.Parse() method converts a string to an integer.

3fill in blank

hard

Fix the error in the code to safely convert a string to an integer using TryParse.

C Sharp (C#)

string input = "456";
if (int.[1](input, out int result))
{
    Console.WriteLine(result);
}
else
{
    Console.WriteLine("Conversion failed");
}

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ATryParse

BToInt32

CConvert

DParse

Attempts:

3 left

💡 Hint

Common Mistakes

Using Parse which throws exceptions on failure.

Using Convert which does not have TryParse.

int.TryParse() attempts to convert a string to int safely without throwing exceptions.

4fill in blank

hard

Fill both blanks to convert a double to an integer using casting and print the result.

C Sharp (C#)

double value = 9.78;
int intValue = ([1]) value;
Console.WriteLine([2]);

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Aint

Bvalue

CintValue

Ddouble

Attempts:

3 left

💡 Hint

Common Mistakes

Casting to double instead of int.

Printing the original double variable instead of the casted int.

We cast the double value to int and print the integer variable intValue.

5fill in blank

hard

Fill all three blanks to create a dictionary with string keys and integer values, filtering only values greater than 10.

C Sharp (C#)

var data = new Dictionary<string, int> { {"a", 5}, {"b", 15}, {"c", 25} };
var filtered = data.Where(kv => kv.Value [1] 10)
               .ToDictionary(kv => kv.[2], kv => kv.[3]);
foreach (var item in filtered)
{
    Console.WriteLine($"{item.Key}: {item.Value}");
}

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

A>

BKey

CValue

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than operator which filters wrong entries.

Mixing up Key and Value in the dictionary creation.

The code filters dictionary entries where the value is greater than 10, then creates a new dictionary using the original keys and values.