C#认证考试试题汇编： 第二单元：1,11

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

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();
}
}
}

 11、

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();
}
}
}