using System;

namespace DemoMoreTypesMembers
{
    public struct Money
    {
        // Fields.
        private double mAmount;
        private const string mCurrencySymbol = "$";

        // Constructor.
        public Money(double amount)
        {
            this.mAmount = amount;
        }

        // Arithmetic operators.
        public static Money operator +(Money m1, Money m2)
        {
            return new Money(m1.mAmount + m2.mAmount);
        }

        public static Money operator -(Money m1, Money m2)
        {
            return new Money(m1.mAmount - m2.mAmount);
        }

        public static Money operator ++(Money m1)
        {
            return m1 + new Money(1.0);
        }

        public static Money operator --(Money m1)
        {
            return m1 - new Money(1.0);
        }

        // Comparison operators.
        public static bool operator ==(Money m1, Money m2)
        {
            return m1.mAmount == m2.mAmount;
        }

        public static bool operator !=(Money m1, Money m2)
        {
            return !(m1 == m2);
        }

        public static bool operator >(Money m1, Money m2)
        {
            return m1.mAmount > m2.mAmount;
        }

        public static bool operator <(Money m1, Money m2)
        {
            return m1.mAmount < m2.mAmount;
        }

        public static bool operator >=(Money m1, Money m2)
        {
            return m1.mAmount >= m2.mAmount;
        }

        public static bool operator <=(Money m1, Money m2)
        {
            return m1.mAmount <= m2.mAmount;
        }

        // Object-class overrides.
        public override bool Equals(object other)
        {
            if (!(other is Money))
                return false;
            else
                return (this == (Money)other);
        }

        public override int GetHashCode()
        {
            return (int)(mAmount * 100);
        }

        public override string ToString()
        {
            return mCurrencySymbol + this.mAmount;
        }
    }


    static class OperatorsDemo
    {
        public static void DoDemo()
        {
            Console.WriteLine("\nOperatorsDemo");
            Console.WriteLine("------------------------------------------------------");

            Money dosh1 = new Money(27.50);
            Money dosh2 = new Money(10.30);

            Console.WriteLine("Initial values:");
            Console.WriteLine("dosh1: {0}", dosh1);
            Console.WriteLine("dosh2: {0}", dosh2);

            Console.WriteLine("\nIllustrate + and - operators:");
            Console.WriteLine("dosh1 + dosh2: {0}", dosh1 + dosh2);
            Console.WriteLine("dosh1 - dosh2: {0}", dosh1 - dosh2);

            Console.WriteLine("\nIllustrate += and -= operators:");
            Money dosh3 = new Money(100.0);
            dosh3 += dosh1;
            dosh3 -= dosh2;
            Console.WriteLine("dosh3: {0}", dosh3);

            Console.WriteLine("\nIllustrate ++ and -- operators:");
            Money dosh4 = ++dosh1;
            Money dosh5 = dosh2--;
            Console.WriteLine("dosh1: {0}", dosh1);
            Console.WriteLine("dosh4: {0}", dosh4);
            Console.WriteLine("dosh2: {0}", dosh2);
            Console.WriteLine("dosh5: {0}", dosh5);

            Console.WriteLine("\nIllustrate comparison operators:");
            Console.WriteLine("dosh1 and dosh2 {0}", (dosh1 == dosh2) ? "equal" : "different");
            Console.WriteLine("dosh1 and dosh2 {0}", (dosh1 != dosh2) ? "different" : "equal");
            Console.WriteLine("dosh1 is {0}> dosh2", (dosh1 > dosh2) ? "" : "NOT ");
            Console.WriteLine("dosh1 is {0}< dosh2", (dosh1 < dosh2) ? "" : "NOT ");
            Console.WriteLine("dosh1 is {0}>= dosh2", (dosh1 >= dosh2) ? "" : "NOT ");
            Console.WriteLine("dosh1 is {0}<= dosh2", (dosh1 <= dosh2) ? "" : "NOT ");

            Console.ReadLine();
        }
    }
}