TryParse for safe conversion in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to safely convert a string to an integer using TryParse.

C Sharp (C#)

int number;
bool success = int.[1]("123", out number);

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

ATryParse

BToInt32

CParse

DConvert

Attempts:

3 left

💡 Hint

Common Mistakes

Using Parse which throws an exception on failure.

Using Convert which throws exceptions for invalid input.

The TryParse method attempts to convert the string to an integer safely without throwing an exception if it fails.

2fill in blank

medium

Complete the code to check if the string "456" can be converted to an integer.

C Sharp (C#)

if (int.[1]("456", out int result))
{
    Console.WriteLine("Conversion succeeded: " + result);
}

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AToInt32

BConvert

CParse

DTryParse

Attempts:

3 left

💡 Hint

Common Mistakes

Using Parse which throws exceptions instead of returning a boolean.

Not using the out keyword for the result parameter.

TryParse returns true if conversion succeeds, allowing safe checking before using the result.

3fill in blank

hard

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

C Sharp (C#)

double value;
bool success = double.[1]("12.34", out value);

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AToDouble

BTryParse

CConvert

DParse

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the out keyword causes a compile error.

Using Parse which throws exceptions on invalid input.

TryParse requires the second argument to be passed with the out keyword to store the converted value.

4fill in blank

hard

Fill both blanks to create a dictionary with word lengths only for words longer than 4 characters.

C Sharp (C#)

var words = new List<string> { "apple", "cat", "banana", "dog" };
var lengths = new Dictionary<string, int> { { "length", 0 } };
lengths = words.ToDictionary(word => word, word => word.[1]);
var filtered = lengths.Where(kv => kv.Value [2] 4).ToDictionary(kv => kv.Key, kv => kv.Value);

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ALength

BCount

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using Count which is not a string property.

Using < instead of > causing wrong filtering.

Use Length to get the length of each word and filter with > to keep words longer than 4 characters.

5fill in blank

hard

Fill all three blanks to create a dictionary of uppercase words and their lengths, filtering only words longer than 3 characters.

C Sharp (C#)

var words = new List<string> { "tree", "sun", "flower", "sky" };
var result = words.Where(word => word.[3] [1] 3)
                  .ToDictionary(word => word.[2](), word => word.[3]);

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ALength

B>

CToUpper

DCount

Attempts:

3 left

💡 Hint

Common Mistakes

Using Count instead of Length for string length.

Not using parentheses for ToUpper method call.

Using < instead of > in the filter.

Filter words with length greater than 3, convert keys to uppercase with ToUpper(), and use Length for values.