Passing value types to methods in C Sharp (C#) - Mini Project: Build & Apply

Passing value types to methods

📖 Scenario: Imagine you have a simple calculator program that needs to double a number. You want to see how passing a number (a value type) to a method works in C#.

🎯 Goal: You will create a method that tries to double a number passed to it. Then you will see if the original number changes after calling the method.

📋 What You'll Learn

Create an integer variable named number with the value 10.

Create a method named DoubleValue that takes an integer parameter named value and doubles it inside the method.

Call the DoubleValue method passing the number variable.

Print the value of number after calling the method to see if it changed.

💡 Why This Matters

🌍 Real World

Understanding how value types are passed to methods helps you avoid bugs when working with numbers, dates, and other simple data in programs.

💼 Career

Many programming jobs require clear understanding of how data is passed to functions or methods to write correct and efficient code.

1

Create the initial value variable

Create an integer variable called number and set it to 10.

C Sharp (C#)

# Create an integer variable called number and set it to 10
// Your code here

Need a hint?

Use int number = 10; to create the variable.

2

Create the method to double the value

Create a method named DoubleValue that takes an integer parameter called value and doubles it by setting value = value * 2; inside the method.

C Sharp (C#)

int number = 10;

// Create the DoubleValue method below
// Your code here

Need a hint?

Define the method with void DoubleValue(int value) and multiply value by 2 inside.

3

Call the method with the variable

Call the method DoubleValue passing the variable number as the argument.

C Sharp (C#)

int number = 10;

void DoubleValue(int value)
{
    value = value * 2;
}

// Call DoubleValue passing number
// Your code here

Need a hint?

Call the method by writing DoubleValue(number);

4

Print the value after method call

Print the value of number using Console.WriteLine(number); to see if it changed after calling DoubleValue.

C Sharp (C#)

int number = 10;

void DoubleValue(int value)
{
    value = value * 2;
}

DoubleValue(number);

// Print the value of number
// Your code here

Need a hint?

Use Console.WriteLine(number); to print the value.