Parameters and arguments in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a method that takes one integer parameter.

C Sharp (C#)

void PrintNumber([1] number) {
    Console.WriteLine(number);
}

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

Abool

Bstring

Cint

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to specify the type of the parameter.

Using a wrong type that doesn't match the argument.

The method parameter must have a type. Here, int is the correct type for an integer parameter.

2fill in blank

medium

Complete the code to call the method with an argument.

C Sharp (C#)

PrintNumber([1]);

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

A5

B"5"

Ctrue

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a string instead of an integer.

Passing a boolean or null where an integer is expected.

The method expects an integer argument. Passing 5 (without quotes) is correct.

3fill in blank

hard

Fix the error in the method declaration by completing the parameter list.

C Sharp (C#)

void Greet([1] name) {
    Console.WriteLine($"Hello, {name}!");
}

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

Aint

Bstring

Cbool

Ddouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using a numeric type for a text parameter.

Forgetting to specify the parameter type.

The parameter name should be a string because it holds text.

4fill in blank

hard

Fill both blanks to declare a method with two parameters and call it with matching arguments.

C Sharp (C#)

void AddNumbers([1] a, [2] b) {
    Console.WriteLine(a + b);
}

AddNumbers(3, 4);

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

Aint

Bstring

Cbool

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing different types for parameters.

Using non-numeric types for addition.

Both parameters should be integers to add numbers correctly.

5fill in blank

hard

Fill all three blanks to declare a method with parameters and call it with arguments.

C Sharp (C#)

void DisplayInfo([1] name, [2] age) {
    Console.WriteLine($"Name: {name}, Age: {age}");
}

DisplayInfo([3], 30);

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

Astring

Bint

C"Alice"

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Passing wrong types as arguments.

Forgetting quotes around string arguments.

The method parameters are string and int. The argument for name must be a string literal like "Alice".

Practice

1. What is the role of a parameter in a C# method?

easy

A. It acts as a placeholder for values passed to the method.

B. It stores the result returned by the method.

C. It defines the method's name.

D. It calls another method inside the current method.

Solution

1. Step 1: Understand method definition

   Parameters are declared in the method signature to receive values.

2. Step 2: Differentiate parameters from other parts

   Parameters are not method names or return values but placeholders for inputs.

3. Final Answer:

   It acts as a placeholder for values passed to the method. -> Option A

4. Quick Check:

   Parameter = placeholder [OK]

Hint: Parameters hold input spots in methods [OK]

Common Mistakes:

• Confusing parameters with return values
• Thinking parameters are method names
• Mixing parameters with method calls

2. Which of the following is the correct way to define a method with one integer parameter named number in C#?

easy

A. void PrintNumber(number int) { }

B. void PrintNumber(int) { }

C. void PrintNumber(int number) { }

D. void PrintNumber(number) { }

Solution

1. Step 1: Recall C# parameter syntax

   Parameters require type first, then name: int number.

2. Step 2: Check each option

   void PrintNumber(int number) { } matches correct syntax; others have wrong order or missing names.

3. Final Answer:

   void PrintNumber(int number) { } -> Option C

4. Quick Check:

   Type before name in parameters [OK]

Hint: Parameter syntax: type then name [OK]

Common Mistakes:

• Swapping parameter type and name
• Omitting parameter name
• Using parentheses without parameter types

3. What will be the output of this C# code?

void Greet(string name) {
    Console.WriteLine($"Hello, {name}!");
}

Greet("Alice");

medium

A. Hello, Alice!

B. Hello, name!

C. Hello, !

D. Error: Missing argument

Solution

1. Step 1: Identify the parameter and argument

   The method Greet has a parameter name and is called with argument "Alice".

2. Step 2: Understand string interpolation output

   The output will replace {name} with "Alice" in the printed string.

3. Final Answer:

   Hello, Alice! -> Option A

4. Quick Check:

   Argument replaces parameter in output [OK]

Hint: Arguments fill parameters when calling methods [OK]

Common Mistakes:

• Printing parameter name literally
• Forgetting to pass argument
• Confusing parameter with variable

4. What is wrong with this method call?

void PrintSum(int a, int b) {
    Console.WriteLine(a + b);
}

PrintSum(5);

medium

A. Too many arguments passed.

B. Too few arguments passed.

C. Parameter types do not match arguments.

D. Method name is incorrect.

Solution

1. Step 1: Check method parameters

   The method PrintSum requires two integer parameters: a and b.

2. Step 2: Check method call arguments

   The call PrintSum(5); provides only one argument instead of two.

3. Final Answer:

   Too few arguments passed. -> Option B

4. Quick Check:

   Parameter count must match argument count [OK]

Hint: Count arguments to match parameters [OK]

Common Mistakes:

• Passing fewer arguments than parameters
• Ignoring method signature requirements
• Assuming default values without specifying

5. You want to create a method CalculateArea that takes two parameters width and height and returns their product. Which method signature and call correctly use parameters and arguments?

hard

A. Method: int CalculateArea(int width, int height)Call: CalculateArea(5);

B. Method: int CalculateArea(width, height)Call: CalculateArea(5, 10);

C. Method: void CalculateArea(int width, int height)Call: CalculateArea(5, 10);

D. Method: int CalculateArea(int width, int height)Call: CalculateArea(5, 10);

Solution

1. Step 1: Check method signature correctness

   Method: int CalculateArea(int width, int height)
   Call: CalculateArea(5, 10); correctly declares parameter types and names and returns int.

2. Step 2: Check method call arguments

   Method: int CalculateArea(int width, int height)
   Call: CalculateArea(5, 10); calls method with two integer arguments matching parameters.

3. Step 3: Analyze other options

   Method: int CalculateArea(width, height)
   Call: CalculateArea(5, 10); misses types in parameters; Method: int CalculateArea(int width, int height)
   Call: CalculateArea(5); passes only one argument; Method: void CalculateArea(int width, int height)
   Call: CalculateArea(5, 10); returns void, so no product returned.

4. Final Answer:

   Method with int parameters and int return, called with two arguments. -> Option D

5. Quick Check:

   Signature and call must match parameters and arguments [OK]

Hint: Match parameter types and argument count exactly [OK]

Common Mistakes:

• Omitting parameter types
• Passing wrong number of arguments
• Using void return when value needed