String concatenation behavior in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to concatenate two strings and print the result.

C Sharp (C#)

string greeting = "Hello" + [1];
Console.WriteLine(greeting);

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

A" World"

BWorld

C' World'

D "World"

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes instead of double quotes for strings.

Forgetting to put quotes around the string to concatenate.

In C#, strings must be enclosed in double quotes. Adding " World" concatenates the two strings correctly.

2fill in blank

medium

Complete the code to concatenate a string and an integer by converting the integer to a string.

C Sharp (C#)

int number = 5;
string message = "Number: " + [1];
Console.WriteLine(message);

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

AConvert.ToInt32(number)

Bnumber

Cnumber.ToString()

Dnumber + 1

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to concatenate integer directly without conversion.

Using incorrect conversion methods like Convert.ToInt32 which converts to int, not string.

To concatenate an integer with a string, convert the integer to a string using ToString().

3fill in blank

hard

Fix the error in the code to concatenate strings using the String.Concat method.

C Sharp (C#)

string part1 = "Good";
string part2 = "Morning";
string result = String.Concat(part1, [1]);
Console.WriteLine(result);

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

Apart2

B"part2"

Cpart2.ToString()

Dpart1 + part2

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around variable names, which makes them string literals.

Trying to concatenate inside the method call incorrectly.

The String.Concat method concatenates string arguments. Use the variable part2 directly without quotes.

4fill in blank

hard

Fill both blanks to create a string interpolation that includes a variable and an expression.

C Sharp (C#)

int apples = 3;
string message = $"I have [1] apples and [2] more.";
Console.WriteLine(message);

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

Aapples

Bapples + 2

C{apples + 2}

D{apples}

Attempts:

3 left

💡 Hint

Common Mistakes

Not using curly braces inside the interpolated string.

Using variables without braces in an interpolated string.

In string interpolation, expressions must be inside curly braces. Use {apples} and {apples + 2} inside the string.

5fill in blank

hard

Fill all three blanks to build a concatenated string with a variable, a method call, and a literal.

C Sharp (C#)

string name = "Anna";
string greeting = "Hello, " + [1] + ", you have " + [2] + [3];
Console.WriteLine(greeting);

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

Aname

Bname.ToUpper()

C" apples."

D" apples"

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around variable names.

Forgetting the period in the string literal.

Not calling the method correctly.

The code concatenates the variable name, the uppercase version of name, and a string literal with a period. Use name, name.ToUpper(), and " apples.".