2.1-11

namespace Txst2_1
{
    class Animal
    {
        private Boolean m_sex;
        private int m_age;
        public bool Sex
        {
            get { return m_sex; }
set { m_sex = false; }
        }
        public int  Age
        {
            get { return m_age; }
            set { m_age = value; }
        }
        public virtual string Introduce()
        {
            if (Sex == true)
                return "This is a male Animal";
            else
                return "This is a female Animal";
        }
    }
    class Dog:Animal
    {
        public Dog()
        {
            Sex = true;
        }
        public override string Introduce()
        {
            if (Sex == true)
                return "This is a male Dog";
            else
                return "This is a female Dog";
        }
    }
    class Cat:Animal
    {
        public override string Introduce()
        {
            if (Sex == true)
                return "This is a male Cat";
            else
                return "This is a female Cat";
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Animal ani = new Animal();
            Console.WriteLine(ani.Introduce());
            Animal dog = new Dog();
            Console.WriteLine(dog.Introduce());
            Animal cat = new Cat();
            Console.WriteLine(cat.Introduce());
            Console.Read();
        }
    }
}

 

 

namespace Txst_2._1 {     class Animal     {         private Boolean m_sex; private string m_sound;         public Animal()         {             m_sex = false; m_sound = "Howl...";         }         public bool Sex         {             get{ return m_sex; }             set { m_sex = value; }

        }         public string Sound         { get { return m_sound; } set { m_sound = value; }         }         public virtual string Roar()         {             return "Animal" + m_sound;         }     }     class Dog:Animal     {         public Dog()         {             Sex = true;             Sound = "Wow...";         }         public override string Roar()         {             return "Dog:" + Sound;         }     }     class Cat:Animal     {         public Cat()         {             Sound = "Miaow...";         }         public override string Roar()         {             return "Cat:" + Sound;         }     }     class Cow:Animal     {         public Cow()         {             Sound = "Moo...";         }         public override string Roar()         {             return "Cow:" + Sound;         }     }     class Program     { static void Main(string[] args)         {

            Animal animal;             animal = new Dog();             Console.WriteLine(animal.Roar());             animal = new Cat();             Console.WriteLine(animal.Roar());             animal = new Cow();             Console.WriteLine(animal.Roar());             Console.Read();         }     } }