working on project with four classes (need serious help)

Question

create an application with four classes. three of the classes should contain data and behavior characteristics for circle, rectangle, and cylinder. the fourth class should allow the user to input a figure type from a menu of options. prompt for appropiate values based on the inputted figure type, instantiate an object of the type entered, and display characteristics about the object.
i have code for the circle but i cant figure out how to make the main class work with the other classes (circle, rectangle, and cylinder)
here is my code for the circle:
using System;

public class Sphere
{
// obtain radius from user and display volume of sphere
public void DetermineSphereVolume()
{
Console.Write( "Enter radius of sphere: " );
double radius = Convert.ToDouble( Console.ReadLine() );

Console.WriteLine( "Volume is {0:F3}", SphereVolume( radius ) );
} // end method DetermineSphereVolume

// calculate and return sphere volume
public double SphereVolume( double radius )
{
double volume = ( 4.0 / 3.0 ) * Math.PI * Math.Pow( radius, 3 );
return volume;
} // end method SphereVolume
} // end class Sphere

// Calculate the volume of a sphere.
public class SphereTest
{
// application starting point
public static void Main( string[] args )
{
Sphere mySphere = new Sphere();
mySphere.DetermineSphereVolume();
} // end Main
} // end class SphereTest

Crish · Answer

hi All I think this is perfect answer for solution.

Hetalkumar Kachhadiya · Answer

Hi Kel following is the solution of your query. You need to implement the factory design pattern to achieve this. class Program { static void Main(string[] args) { int shapeType = GetShapeType(); if (shapeType>3) { Console.WriteLine(Invalid shape type. Please select either 1 2 or 3); shapeType = GetShapeType(); } IShape objShape; objShape = ShapeFactory.GetShape(shapeType); objShape.DisplayShapeDetails(); Console.ReadKey(); } private static int GetShapeType() { Console.Clear(); int shapeType; Console.Write(Please enter the type of Shape:); shapeType = Convert.ToInt16(Console.ReadLine()); return shapeType; } } //This enum will generalize your implementation for various classes required related to other different shapes. public enum Shape { Circle=1 Rectangle=2 Cylinder=3 } //This interface will be used for defining the contract for various shapes public interface IShape { void DisplayShapeDetails(); } //As per the requirement specified by you ShapeFactory is the fourth class which is responsible for centralized creation of the object of type of class of the shape specified by the user public class ShapeFactory { public static IShape GetShape( int _shapeType) { IShape objShape; switch (_shapeType) { case (( int ) Shape .Circle): int radius; Console .Write( Please enter the Radius of the circle: ); radius = Convert .ToInt16( Console .ReadLine()); objShape= new Circle (radius); break ; case (( int ) Shape .Rectangle): int length width; Console .Write( Please enter the Length of the Rectangle: ); length = Convert .ToInt16( Console .ReadLine()); Console .Write( Please enter the Width of the Rectangle: ); width = Convert .ToInt16( Console .ReadLine()); objShape = new Rectangle (length width); break ; case (( int ) Shape .Cylinder): int height; Console .Write( Please enter the Height of the Cylinder: ); height = Convert .ToInt16( Console .ReadLine()); Console .Write( Please enter the Radius of the Cylinder: ); radius = Convert .ToInt16( Console .ReadLine()); objShape = new Cylinder (height radius); break ; default : objShape = null ; break ; } return objShape; } } //Circle class public class Circle : IShape { private Shape _shapeType; private double _radius; public Circle() { } public Circle( double Radius) { _radius = Radius; _shapeType = Shape .Circle; } public void DisplayShapeDetails() { Shape test = ( Shape )_shapeType; Console .WriteLine( Area of the selected shape '{0}' is {1}  Enum .GetName( typeof ( Shape ) _shapeType) CalculateArea().ToString()); } private double CalculateArea() { return Math .PI * (_radius * _radius); } } //Rectangle Class public class Rectangle : IShape { private Shape _shapeType; private double _length; private double _width; public Rectangle() { } public Rectangle( double Length double Width) { _length = Length; _width = Width; _shapeType = Shape .Rectangle; } public void DisplayShapeDetails() { Shape test = ( Shape )_shapeType; Console .WriteLine( Area of the selected shape '{0}' is {1}  Enum .GetName( typeof ( Shape ) _shapeType) CalculateArea().ToString()); } private double CalculateArea() { return _length * _width; } } //Cylinder class public class Cylinder : IShape { private Shape _shapeType; private double _height; private double _radius; public Cylinder() { } public Cylinder( double Height double Radius) { _height = Height; _radius = Radius; _shapeType = Shape .Cylinder; } public void DisplayShapeDetails() { Shape test = ( Shape )_shapeType; Console .WriteLine( Area of the selected shape '{0}' is {1}  Enum .GetName( typeof ( Shape ) _shapeType) CalculateVolume().ToString()); } private double CalculateVolume() { return ( Math .PI * _height * _radius * _radius); } } If you need to add another shape (For example Cube) then you have define a corresponding class named 'Cube' which implements the 'IShape' interface and need to add a case for the same into the ShapeFactory class. Please let me know if you have any queries in this reply.

Amit Choudhary · Answer

hi Similarly create another classes for rectangle cylinder etc. and in your fourth class create for method to create four type of shapes means creating the four instance in those methods. use switch case and on the basis of user selection call the appropriate method. and show the details according to that. hope you have an idea now. Please mark Do you like the answer? if it helps you.