//55，类的声明示例
using System;
class Date
{
public
int year;
public int month;
public
int day;
public void print()
{
Console.WriteLine("{0}/{1:D2}/{2:D2}", year, month, day);
}
}
class Program
{
static void
Main()
{
Date t = new Date();
Console.Write("请输入年:");
t.year =
Convert.ToInt32(Console.ReadLine());
Console.Write("请输入月:");
t.month =
Convert.ToInt32(Console.ReadLine());
Console.Write("请输入年:");
t.day =
Convert.ToInt32(Console.ReadLine());
t.print();
}
}
//56,利用“属性”访问私有数据成员示例
using
System;
class Date
{
int year;
int month;//默认私有成员
int day;
public
int Year
{
get { return year; }
set { year =
value; }
}
public int
Month
{
get
{ return month; }
set { month =
value; }
}
public int
Day
{
get {
return day; }
set { day = value;
}
}
public string
Print//定义日期信息属性
{
get
{
return
Year + "/" + Month + "/" + Day;
}
}
}
class Program
{
static void Main()
{
Date d = new
Date();
d.Year =
2010;
d.Month =
4;
d.Day =
20;
Console.WriteLine(d.Print);
}
}
//57,利用‘属性"和"方法"访问私有数据成员示例
using System;
class
Date
{
int year, month, day;
public int Year
{
set { year = value;
}
}
public int
Month
{
set
{ month = value; }
}
public int
Day
{
set {
day = value; }
}
public void
Print()
{
Console.WriteLine("year:" + 2010);
Console.WriteLine("month:" + 4);
Console.WriteLine("day:" + 20);
}
}
class
Program
{
public static void
Main()
{
Date d = new Date();
d.Print();
}
}
//58,声明一个正方形类型和一个圆类型，然后分别求他们的面积
using System;
class
Square
{
int length;
public void
set(int l)
{
length = l;
}
public int
area()
{
return length * length;
}
}
class
Circle
{
int length;
public void
set(int l)
{
length = l;
}
public double
area()
{
return 3.1416 * length * length / 4;
}
}
class
Program
{
static void Main()
{
Square s = new
Square();
s.set(15);
Console.WriteLine("正方形面积为:{0}",
s.area());
Circle c = new
Circle();
c.set(10);
Console.WriteLine("圆形面积为:{0}",
c.area());
Console.ReadLine();
}
}
//59,声明一个日期类，并进行日期的设置，判断闰年和输出等有关操作
using System;
class
Date
{
int year, month, day;
public void set(int y, int m, int d)
{
year =
y;
month =
m;
day = d;
}
public bool isLeapYear()
{
return (year % 4 == 0 &&
year % 100 != 0) || (year % 400 == 0);
}
public void print()
{
Console.WriteLine("{0}-{1:D2}-{2:D2}", year, month, day);
}
}
class Program
{
static void
Main()
{
Date d = new Date();
d.set(2000,
12, 6);
if
(d.isLeapYear())
d.print();
}
}
//60,构造函数的定义
using
System;
class Box
{
public Box(int h, int w, int
l)
{
height
= h;
width =
w;
length =
l;
}
public int
volume()
{
return (height * width * length);
}
private int height, width, length;
}
class
Program
{
static void Main()
{
Box box1 = new Box(12, 25,
30);
Console.WriteLine("长方形box1的体积是:{0}",
box1.volume());
Box box2 = new
Box(15, 30, 21);
Console.WriteLine("长方形box2的体积是:{0}", box2.volume());
}
}
//61,使用不同参数用构造函数对成员变量赋初值示例。重载构造函数
using System;
class
Box
{
public Box()
{
height =
10;
width =
10;
length =
10;
}
public Box(int
h)
{
height
= h;
width =
10;
length =
10;
}
public Box(int h,int
w)
{
height
= h;
width =
w;
length =
10;
}
public Box(int h,int w,int
l)
{
height
= h;
width =
w;
length =
l;
}
public int
volume()
{
return (height * width * length);
}
private int height,width,length;
}
class
Program
{
static void Main()
{
Box box1=new
Box();
Console.WriteLine("长方形box1的体积是:{0}",box1.volume());
Box box2=new Box(15);
Console.WriteLine("长方形box2的体积是:{0}",box2.volume());
Box box3=new Box(15,30);
Console.WriteLine("长方形box3的体积是:{0}",box3.volume());
Box box4=new Box(15,30,20);
Console.WriteLine("长方形box4的体积是:{0}",box4.volume());
}
}
//62,析构函数
using System;
class Date
{
public Date(int y, int m, int d)
{
year =
y;
month =
m;
day =
d;
Console.WriteLine("{0}:构造函数已被调用.", day);
}
~Date()
{
Console.WriteLine("{0}:析构函数已被调用", day);
}
public void print()
{
Console.WriteLine("{0}.{1}.{2}",
year, month, day);
}
private int
year;
private int month;
private int
day;
}
class Program
{
static void
Main()
{
Date today = new Date(2010, 9, 1);
Date tomorrow = new Date(2010, 9,
2);
Console.Write("今天是:");
today.print();
Console.Write("明天是:");
tomorrow.print( );
}
}
//63,用不同对象调用同一个函数成员输出学生的平均分示例
using System;
class
Student
{
float score1;
float
score2;
public Student(float s1, float
s2)
{
score1
= s1;
score2 =
s2;
}
public float
ave()
{
float average;
average = (score1 +
score2) / 2;
return
average;
}
}
class
Program
{
static void Main()
{
Student Zhang = new
Student(89.0f, 94.5f);
Student Li
= new Student(88.0f, 89.5f);
Student Wang = new Student(90.0f,
82.5f);
Console.WriteLine("张的平均成绩是:{0}", Zhang.ave(
));
Console.WriteLine("李的平均成绩是:{0}",
Li.ave());
Console.WriteLine("王的平均成绩是:{0}", Wang.ave());
}
}
//64,使用多个对象处理有关学生类问题的示例
using System;
class
Student
{
public Student(int n, int a, int
s)
{
num=n;
age =
a;
score =
s;
}
public void
print()
{
Console.WriteLine("num:{0}", num);
Console.WriteLine("age:{0}", age);
Console.WriteLine("score:{0}", score);
}
private int num, age, score;
}
class
Program
{
static void Main()
{
Student stud1 = new
Student(1001, 18, 87);
Student
stud2 = new Student(1002, 19, 76);
Student stud3 = new Student(1003, 18,
72);
stud1.print();
stud2.print();
stud3.print();
}
}
//65.使用对象数组来处理学生类问题
using
System;
class Student
{
public Student(int n, int a,
int s)
{
num
= n;
age =
a;
score =
s;
}
public void
print()
{
Console.WriteLine("学号: {0}", num);
Console.WriteLine("年龄: {0}", age);
Console.WriteLine("成绩: {0}", score);
}
private int num, age, score;
}
class
Program
{
static void Main( )
{
Student[] stud = new Student[3]
{ new Student(1001, 18, 87), new Student(1002, 19, 76), new Student(1003, 18,
72) };
for (int i = 0; i <
stud.Length; i++)
{
stud[i].print();
}
}
}
原文：http://www.cnblogs.com/zhangyongjian/p/3623826.html