C# 类的定义及构造函数的重载

<span style="font-family:FangSong_GB2312;font-size:18px;">
1.类的定义及构造函数的重载

代码如下：</span>

<span style="font-family:FangSong_GB2312;font-size:18px;"> </span><pre name="code" class="csharp">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace _8_4
{
class student
{
string strname;
public student(string name)
{
strname = name;
Console.WriteLine("姓名?：" + strname + " 性别： 未知" + " 年龄 ： 未知");
}
public student(string name,string sex)
{
strname = name;
Console.WriteLine("姓名：" + strname + " 性别： " + sex + " 年龄： 未知");
}
public student(string name, string sex,int age)
{
strname = name;
Console.WriteLine("姓名：" + strname + " 性别： " + sex + " 年龄：" + age);
}
~student()
{
Console.WriteLine("学生信息" + strname + "输出完毕");
}
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine("输出学生信息：");
student stu1 = new student("二狗子");
student stu2 = new student("翠花","女");
student stu3 = new student("狗剩","男",30);
Console.ReadLine();
}
}
}

运行结果：

2.方法的重载

代码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace p_134{class Program{const double PI = 3.1415926;double getgriph(double r){return 2 * PI * r;}double getgriph(double width,double length){return 2 * (width + length);}static void Main(string[] args){try{Program pro = new Program();Console.WriteLine("计算圆的周长：");double dec_r = Convert.ToDouble(Console.ReadLine());Console.WriteLine("圆的周长为：" + pro.getgriph(dec_r));Console.WriteLine("输入矩形的长和宽(以逗号分隔)");string rectvalue = Console.ReadLine();string[] rectsplit = rectvalue.Split(new char[] { ',' });double dec_length = Convert.ToInt32(rectsplit[0]);double dec_width = Convert.ToInt32(rectsplit[1]);Console.WriteLine("矩形的周长为：   " + pro.getgriph(dec_length, dec_width));}catch (Exception e) { Console.WriteLine(e.Message); }Console.ReadLine();}}}

运行结果：

3.定义一个类，描述一个矩形，包含有长、宽两种属性，有一个无参数构造方法,对长宽赋初值为10,8；一个带两个参数方法，对长宽赋值；一个计算面积方法。编写一个测试类，对以上类进行测试，创建一个长方形，定义其长、宽，输出其面积。<span style="font-family:FangSong_GB2312;font-size:18px;">using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace 类与对象{class rect{double rect_length ;double rect_width ;public double Rect_width{get { return rect_width; }set { rect_width = value; }}public double Rect_length{get { return rect_length; }set { rect_length = value; }}public void rect_shape(){rect_length = 10;rect_width = 8;}public double getarea(){return rect_length * rect_width;}static void Main(string[] args){rect shape = new rect();shape.rect_shape();Console.WriteLine("默认矩形的面积：" + shape.getarea());Console.WriteLine( );shape.rect_length = 100;shape.rect_width = 80;Console.WriteLine("矩形的长" + shape.Rect_length);Console.WriteLine("矩形的宽" + shape.Rect_width);Console.WriteLine("矩形的面积：" + shape.getarea());Console.ReadLine();}}}</span>运行结果：