C# Program to Add Two Numbers

Last modified on: October 20, 2024

<h3>C# Program to Add Two Numbers</h3>
<p>Here&rsquo;s a simple C# program that prompts the user to input two numbers and then calculates and displays their sum.</p>
<hr />
<h3>Code Example</h3>
<pre class="language-csharp"><code>using System;

public class Program
{
    public static void Main(string[] args)
    {
        // Prompt the user to enter the first number
        Console.Write("Enter the first number: ");
        string input1 = Console.ReadLine(); // Read the input

// Prompt the user to enter the second number
        Console.Write("Enter the second number: ");
        string input2 = Console.ReadLine(); // Read the input

try
        {
            // Convert the inputs to integers
            int number1 = Convert.ToInt32(input1);
            int number2 = Convert.ToInt32(input2);

// Calculate the sum
            int sum = number1 + number2;

// Display the result
            Console.WriteLine($"The sum of {number1} and {number2} is: {sum}");
        }
        catch (FormatException)
        {
            Console.WriteLine("Error: Please enter valid numbers.");
        }
        catch (OverflowException)
        {
            Console.WriteLine("Error: The number entered is too large or too small.");
        }
    }
}
</code></pre>
<h3>Explanation of the Code</h3>
<ol>
<li>
<p><strong>Namespaces</strong>: The <code>using System;</code> directive is included to allow the use of basic input and output functionalities.</p>
</li>
<li>
<p><strong>Main Method</strong>: The program starts execution from the <code>Main</code> method.</p>
</li>
<li>
<p><strong>User Input</strong>:</p>
<ul>
<li>The program prompts the user to enter two numbers, which are read as strings using <code>Console.ReadLine()</code>.</li>
</ul>
</li>
<li>
<p><strong>Conversion</strong>:</p>
<ul>
<li>The strings are converted to integers using <code>Convert.ToInt32()</code>. This conversion could throw exceptions if the input is not a valid integer.</li>
</ul>
</li>
<li>
<p><strong>Error Handling</strong>:</p>
<ul>
<li>A <code>try-catch</code> block is used to handle potential exceptions:
<ul>
<li><strong><code>FormatException</code></strong>: Catches invalid formats (e.g., non-numeric input).</li>
<li><strong><code>OverflowException</code></strong>: Catches cases where the input is too large or too small for an <code>int</code>.</li>
</ul>
</li>
</ul>
</li>
<li>
<p><strong>Sum Calculation</strong>: If both inputs are valid, the sum is calculated and displayed using <code>Console.WriteLine()</code>.</p>
</li>
</ol>
<hr />
<h3>How to Run the Program</h3>
<ol>
<li>Open a C# development environment (like Visual Studio or Visual Studio Code).</li>
<li>Create a new C# console application.</li>
<li>Copy and paste the provided code into the <code>Main</code> class.</li>
<li>Run the program and enter two numbers when prompted.</li>
</ol>

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