Return values and void methods in C Sharp (C#) - Mini Project: Build & Apply

Return values and void methods

📖 Scenario: You are creating a simple calculator program that can add two numbers and also print a greeting message.

🎯 Goal: Build a program with one method that returns the sum of two numbers and another method that prints a greeting message without returning anything.

📋 What You'll Learn

Create a method called AddNumbers that takes two integers and returns their sum.

Create a method called PrintGreeting that prints a greeting message and returns nothing (void).

Call both methods from the Main method and display the sum.

💡 Why This Matters

🌍 Real World

Methods that return values and void methods are common in all software programs to organize code and perform tasks.

💼 Career

Understanding how to write and use methods is essential for any programming job, as it helps create reusable and clear code.

1

Create the AddNumbers method

Create a method called AddNumbers that takes two integers named num1 and num2 and returns their sum as an integer.

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
    }

    // Your code here
}

Need a hint?

Use static int AddNumbers(int num1, int num2) and return the sum with return num1 + num2;.

2

Create the PrintGreeting method

Create a method called PrintGreeting that prints the message "Hello, welcome to the calculator!" and returns nothing (void).

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
    }

    static int AddNumbers(int num1, int num2)
    {
        return num1 + num2;
    }

    // Your code here
}

Need a hint?

Use static void PrintGreeting() and inside it use Console.WriteLine to print the greeting.

3

Call both methods in Main

Inside the Main method, call PrintGreeting() first, then call AddNumbers with 5 and 7 as arguments and store the result in an integer variable called sum.

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
        // Your code here
    }

    static int AddNumbers(int num1, int num2)
    {
        return num1 + num2;
    }

    static void PrintGreeting()
    {
        Console.WriteLine("Hello, welcome to the calculator!");
    }
}

Need a hint?

Call PrintGreeting() and then call AddNumbers(5, 7) storing the result in sum.

4

Print the sum result

Add a line in the Main method to print the text "Sum: " followed by the value of the sum variable.

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
        PrintGreeting();
        int sum = AddNumbers(5, 7);
        // Your code here
    }

    static int AddNumbers(int num1, int num2)
    {
        return num1 + num2;
    }

    static void PrintGreeting()
    {
        Console.WriteLine("Hello, welcome to the calculator!");
    }
}

Need a hint?

Use Console.WriteLine("Sum: " + sum); to print the sum.