using System;

​

public class Program

{

    public static void Main()

    {

        ClassA fc=new ClassA(20,true,"classA");

        ClassB sc=new ClassB(123.45F,567.344,'g');

        ClassC tc=new ClassC(3456666666, 7776.555M,33);

            fc.AMethodOne(sc);

            fc.AMethodTwo(tc);

            fc.AMethodThree(sc, tc);

​

            sc.BMethodOne(tc);

            sc.BMethodTwo(fc);

            sc.BMethodThree(tc, fc);

​

            tc.CMethodOne(fc);

            tc.CMethodTwo(sc);

            tc.CMethodThree(fc, sc);

​

    }

}

​

public class ClassA: IConvertible

{

    int integerVar;

    bool boolVar;

    string stringVar="null";

    ClassB b;

    ClassC c;

    public TypeCode GetTypeCode()

    {

        return TypeCode.Object;

    }

​

    public bool ToBoolean(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

     public double ToDouble(IFormatProvider provider)

    {

        return 0;

    }

​

​

    public byte ToByte(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public char ToChar(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public sbyte ToSByte(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public short ToInt16(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public int ToInt32(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public long ToInt64(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public ushort ToUInt16(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public uint ToUInt32(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public ulong ToUInt64(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public float ToSingle(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public decimal ToDecimal(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public DateTime ToDateTime(IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

​

    public string ToString(IFormatProvider provider)

    {

        return this.stringVar.ToString();

    }

​

    public Object ToType(Type conversionType, IFormatProvider provider)

    {

        throw new InvalidCastException();

    }

    public ClassA()

    {

        Console.WriteLine(this.GetType().Name+ " default constructor");

    }

​

    public ClassA(int i, bool b, string str)

    {

        i = 20;

        b = true;

        str = "ClassA variable";

        Console.WriteLine(this.GetType().Name+" 3 parameter constructor");

    }

​

​

    public ClassA(ClassC c)

    {

        Console.WriteLine(this.GetType().Name +"with parameter: " +c.GetType().Name);

    }

    public ClassA(ClassB b)

    {

        Console.WriteLine((this.GetType().Name + "with parameter " +b.GetType().Name));

    }

    public void AMethodOne(ClassB bc)

    {

        ClassC cc =new ClassC(bc);

        //integerVar=Convert.ToInt32(cc);

        Console.WriteLine( this.GetType().Name+" method with parameter "+ bc.GetType().Name);

    }

    public void AMethodTwo(ClassC cc)

    {

        ClassB bc =new ClassB(cc);

        //integerVar=Convert.ToInt32(bc);

        Console.WriteLine( this.GetType().Name+"method with parameter"+ cc.GetType().Name);

    }

    public void AMethodThree(ClassB bc1,ClassC cc1)

    {

        AMethodOne(bc1);

        AMethodTwo(cc1);

        Console.WriteLine( this.GetType().Name +"calling both methods");

    }

}

​

public class ClassB

{

    float f;

    double d;

    char c;

    ClassA a;

    ClassC c1;

    public ClassB()

    {

        Console.WriteLine(this.GetType().Name+" default constructor");

    }

​

    public ClassB(float fVar, double dVar, char cVar)

    {

        fVar = 5678.88888F;

        dVar = 567.3455555;

        cVar = 'a';

        Console.WriteLine(this.GetType().Name+ " 3 parameter constructor");

    }

    public ClassB(ClassC c1)

    {

        Console.WriteLine((this.GetType().Name + " with parameter" +c1.GetType().Name));

    }

    public ClassB(ClassA a)

    {

        Console.WriteLine(this.GetType().Name +"with parameter:" +a.GetType().Name);

    }

    public void BMethodOne(ClassC cc)

    {

        ClassA ac =new ClassA(cc);

        //f=Convert.ToInt32(ac);

        Console.WriteLine( this.GetType().Name+"method with parameter"+ cc.GetType().Name);

    }

    public void BMethodTwo(ClassA ac)

    {

        ClassC cc =new ClassC(ac);

    //  f=Convert.ToInt32(cc);

        Console.WriteLine( this.GetType().Name+"method with parameter"+ ac.GetType().Name);

    }

    public void BMethodThree(ClassC cc2,ClassA ac1)

    {

        BMethodOne(cc2);

        BMethodTwo(ac1);

        Console.WriteLine( this.GetType().Name +"calling both methods");

    }

}

​

public class ClassC

{

    long l;

    decimal d;

    short s;

    ClassB b1;

    ClassA a1;

    public ClassC()

    {

        Console.WriteLine(this.GetType().Name+" default constructor");

    }

​

    public ClassC(long Long, decimal dec, short sVar)

    {

        sVar = 123;

        dec = 9760790567.945095M;

        Long = 568888888888888888;

        Console.WriteLine(this.GetType().Name+" 3 parameter constructor");

    }

​

    public ClassC(ClassA a1)

    {

        Console.WriteLine((this.GetType().Name + " with parameter" +a1.GetType().Name));

    }

    public ClassC(ClassB b1)

    {

        Console.WriteLine(this.GetType().Name +" with parameter:" +b1.GetType().Name);

    }

    public void CMethodOne(ClassA ac)

    {

        ClassB bc =new ClassB(ac);

        //d=Convert.ToDecimal(bc);

        Console.WriteLine( this.GetType().Name+" method with parameter "+ ac.GetType().Name);

    }

    public void CMethodTwo(ClassB bc)

    {

        ClassA ac =new ClassA(bc);

        //d=Convert.ToDecimal(ac);

        Console.WriteLine( this.GetType().Name+" method with parameter "+ bc.GetType().Name);

    }

    public void CMethodThree(ClassA ac2,ClassB bc2)

    {

        CMethodOne(ac2);

        CMethodTwo(bc2);

        Console.WriteLine( this.GetType().Name +" calling both methods ");

    }

​

} 

​