Rectangle Properties Calculator Perimeter, Area and Diagonal in C#

using System;

class Program
{
    static void Main()
    {
        // Prompt the user to enter the width of the rectangle
        Console.Write("Enter the width of the rectangle: ");
        double width;

        // Validate user input
        while (!double.TryParse(Console.ReadLine(), out width) || width <= 0)
        {
            Console.Write("Invalid input. Please enter a positive number for the width: ");
        }

        // Prompt the user to enter the height of the rectangle
        Console.Write("Enter the height of the rectangle: ");
        double height;

        // Validate user input
        while (!double.TryParse(Console.ReadLine(), out height) || height <= 0)
        {
            Console.Write("Invalid input. Please enter a positive number for the height: ");
        }

        // Calculate the perimeter
        double perimeter = 2 * (width + height);

        // Calculate the area
        double area = width * height;

        // Calculate the diagonal using the Pythagorean theorem
        double diagonal = Math.Sqrt((width * width) + (height * height));

        // Display the results
        Console.WriteLine("\nRectangle Properties:");
        Console.WriteLine($"Perimeter: {perimeter}");
        Console.WriteLine($"Area: {area}");
        Console.WriteLine($"Diagonal: {diagonal:F2}"); // Display diagonal rounded to 2 decimal places
    }
}

 Output

//Example Execution 1:
Enter the width of the rectangle: 6
Enter the height of the rectangle: 8

Rectangle Properties:
Perimeter: 28
Area: 48
Diagonal: 10.00

//Example Execution 2:
Enter the width of the rectangle: 5.5
Enter the height of the rectangle: 3.2

Rectangle Properties:
Perimeter: 17.4
Area: 17.6
Diagonal: 6.30

//Example Execution 3 (Invalid Input Handling):
Enter the width of the rectangle: -4
Invalid input. Please enter a positive number for the width: 4

Enter the height of the rectangle: 0
Invalid input. Please enter a positive number for the height: 7

Rectangle Properties:
Perimeter: 22
Area: 28
Diagonal: 8.06