Area Cal

Main.cs

using System;
using System.Collections.Generic;

interface IShapeCalculator
{
    void CalculateAndDisplayArea();
}

class CircleCalculator : IShapeCalculator
{
    public void CalculateAndDisplayArea()
    {
        Console.WriteLine("Enter the radius:");
        double radius = double.Parse(Console.ReadLine());
        double area = Math.PI * radius * radius;
        Console.WriteLine($"The area of the circle is: {area}");
    }
}

class RectangleCalculator : IShapeCalculator
{
    public void CalculateAndDisplayArea()
    {
        Console.WriteLine("Enter the length:");
        double length = double.Parse(Console.ReadLine());
        Console.WriteLine("Enter the width:");
        double width = double.Parse(Console.ReadLine());
        double area = length * width;
        Console.WriteLine($"The area of the rectangle is: {area}");
    }
}

class TriangleCalculator : IShapeCalculator
{
    public void CalculateAndDisplayArea()
    {
        Console.WriteLine("Enter the base:");
        double baseLength = double.Parse(Console.ReadLine());
        Console.WriteLine("Enter the height:");
        double height = double.Parse(Console.ReadLine());
        double area = 0.5 * baseLength * height;
        Console.WriteLine($"The area of the triangle is: {area}");
    }
}

class Program
{
    static readonly Dictionary<string, IShapeCalculator> calculators = new Dictionary<string, IShapeCalculator>
    {
        { "circle", new CircleCalculator() },
        { "rectangle", new RectangleCalculator() },
        { "triangle", new TriangleCalculator() }
    };

    static void Main(string[] args)
    {
        Console.WriteLine("Enter the shape type (circle, rectangle, triangle):");
        string shapeType = Console.ReadLine();

        if (calculators.TryGetValue(shapeType, out var calculator))
        {
            calculator.CalculateAndDisplayArea();
        }
        else
        {
            Console.WriteLine("Invalid shape type entered.");
        }
    }
}