Expression-bodied methods in C Sharp (C#) - Mini Project: Build & Apply

Using Expression-Bodied Methods in C#

📖 Scenario: You are building a simple calculator class to perform basic math operations. You want to write clean and short methods using expression-bodied syntax.

🎯 Goal: Create a Calculator class with expression-bodied methods for addition, subtraction, multiplication, and division. Then use the class to calculate and display results.

📋 What You'll Learn

Create a class called Calculator

Add expression-bodied methods Add, Subtract, Multiply, and Divide

Each method takes two int parameters and returns an int

Use the methods to calculate results for given numbers

Print the results exactly as shown

💡 Why This Matters

🌍 Real World

Expression-bodied methods are used in real-world C# projects to write concise and readable code, especially for simple methods and properties.

💼 Career

Knowing expression-bodied methods helps you write clean code, which is valued in software development jobs and improves maintainability.

1

Create the Calculator class

Create a class called Calculator with no methods yet.

C Sharp (C#)

class Calculator
{
    // Your code here
}

Need a hint?

Use the class keyword followed by the class name Calculator.

2

Add expression-bodied Add and Subtract methods

Inside the Calculator class, add two expression-bodied methods: int Add(int a, int b) => a + b; and int Subtract(int a, int b) => a - b;.

C Sharp (C#)

class Calculator
{
    // Add expression-bodied Add and Subtract methods here
}

Need a hint?

Use the arrow => syntax to write short methods that return the result directly.

3

Add expression-bodied Multiply and Divide methods

Add two more expression-bodied methods inside Calculator: int Multiply(int a, int b) => a * b; and int Divide(int a, int b) => a / b;.

C Sharp (C#)

class Calculator
{
    public int Add(int a, int b) => a + b;
    public int Subtract(int a, int b) => a - b;
    // Add Multiply and Divide methods here
}

Need a hint?

Remember to use the arrow => syntax for these methods as well.

4

Use Calculator methods and print results

Create a Calculator object called calc. Use it to calculate calc.Add(10, 5), calc.Subtract(10, 5), calc.Multiply(10, 5), and calc.Divide(10, 5). Print each result on its own line exactly as: Add: 15, Subtract: 5, Multiply: 50, Divide: 2.

C Sharp (C#)

class Calculator
{
    public int Add(int a, int b) => a + b;
    public int Subtract(int a, int b) => a - b;
    public int Multiply(int a, int b) => a * b;
    public int Divide(int a, int b) => a / b;
}

// Create Calculator object and print results here

Need a hint?

Create an instance of Calculator and use Console.WriteLine with string interpolation to print results.