6.1

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace c6._1

{

public struct myDate

{

public int year;

public int month;

public int day;

public myDate(int y, int m, int d)

{

//必须全部赋值

year = y;

month = m;

day = d;

}

public void DisplayWeek()

{

Console.WriteLine("星期为：{0}", new DateTime(year, month, day).DayOfWeek);

}

public void DisplayData()

{

Console.WriteLine("日期为:{0}/{1}/{2}",year,month,day);

}

}

class Program

{

static void Main(string[] args)

{

Console.Write("请输入年:");

int y = int.Parse(Console.ReadLine());

Console.Write("请输入月:");

int m= int.Parse(Console.ReadLine());

Console.Write("请输入日:");

int d = int.Parse(Console.ReadLine());

myDate d1 = new myDate(y, m, d);

d1.DisplayData();

d1.DisplayWeek();

Console.ReadKey();

}

}

}

6.2

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace c6._2

{

public struct StudentGrade {

public string name;

public double score;

public StudentGrade(string n, double s)

{

name = n;

score = s;

}

public void Display() {

Console.WriteLine("名字:{0} ,成绩:{1}", name, score);

}

}

class Program

{

static void Main(string[] args)

{

//结构体初始化列表

StudentGrade[] stu =

{

new StudentGrade("张三",100),

new StudentGrade("李四",50),

new StudentGrade("王五",40),

new StudentGrade("赵六",60)

};

double sum = 0;

foreach(StudentGrade s in stu)

{

s.Display();

sum += s.score;

}

Console.WriteLine("平均分:{0}", sum / stu.Length);

Console.ReadKey();

}

}

}

6.3

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace c6._3

{

public struct Point {

public int x;

public int y;

public Point(int a,int b)

{

x=a;

y=b;

}

}

/*

public struct Triangle

{

Point a;

Point b;

Point c;

public Triangle(Point x,Point y,Point z){

a = x;

b = y;

c = z;

}

}

*/

class Program

{

static void Main(string[] args)

{

Point a = new Point();

Console.WriteLine("平面坐标点1：x={0},y={1}", a.x, a.y);

Point b = new Point(10, 12);

Console.WriteLine("平面坐标点2：x={0},y={1}", b.x, b.y);

Point c;

c.x = 22;

c.y=3;

Console.WriteLine("平面坐标点3：x={0},y={1}", c.x, c.y);

double side1 = Math.Sqrt(Math.Pow(a.x - b.x, 2) + Math.Pow(a.y - b.y, 2));

double side2 = Math.Sqrt(Math.Pow(a.x - c.x, 2) + Math.Pow(a.y - c.y, 2));

double side3 = Math.Sqrt(Math.Pow(b.x - c.x, 2) + Math.Pow(b.y - c.y, 2));

if (side1 + side2 > side3 && side1 + side3 > side2 && side2 + side3 > side1)

{

double h = (side1 + side2 + side3) / 2;

double area = Math.Sqrt(h * (h - side1) * (h - side2) * (h - side3));

Console.WriteLine("三角形的面积:{0}", area);

}

else//两点重叠才不能构成三角形

Console.WriteLine("不能构成三角形");

Console.ReadKey();

}

}

}

6.4

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace c6._4

{

class Program

{

static void Main(string[] args)

{

Console.ForegroundColor = ConsoleColor.Cyan;

Console.WriteLine("前景色为Cyan");

Console.ResetColor();

Console.WriteLine("重置前景色");

Console.BackgroundColor = ConsoleColor.Red;

Console.WriteLine("背景色");

Console.ReadKey();

}

}

}

6.5

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace c6._5

{

class Program

{

//指明从1开始

enum Days { Monday = 1, Tuesday, Wednesday, Thursday, Firday = 5, Saturday, Sunday };

static void Main(string[] args)

{

Console.WriteLine("输入一个数字：1--7");

while (true)

{

try

{

int d = int.Parse(Console.ReadLine());

if (d > 7 || d < 1)

Console.WriteLine("输入的数字不对");

else

Console.WriteLine("{0}对应于{1}", d, (Days)d);

}

catch (FormatException e)

{

Console.WriteLine(e.Message);

break;

}

}

Console.ReadKey();

}

}

}

6.6

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace c6._6

{

class Program

{

enum Days { Saturday, Sunday, Monday, Tuesday, Wednesday, Thursday, Firday };

[FlagsAttribute]//指示枚举作为一组位域处理

//枚举值是有限制的

enum Colors { Red = 1, Green = 2, Blue = 8, Yello = 16 };

static void Main(string[] args)

{

//typeof用于获取类型

Type weekdays = typeof(Days);

Console.WriteLine("一周七天----对应枚举类型Days中的值：");

//Enum.GetNames检索指定枚举类型中常数名称的数组

foreach (string s in Enum.GetNames(weekdays))//真是神奇的c#啊

Console.WriteLine("{0,-11}={1}", s, Enum.Format(weekdays, Enum.Parse(weekdays, s), "d"));

Colors mcolor = Colors.Red | Colors.Blue | Colors.Yello;

Console.WriteLine("\n枚举变量mcolors存放如下颜色组合：{0}", mcolor);

Console.ReadKey();

}

}

}

6.7

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace c6._7

{

class Program

{

enum Colors {Red,Blue,White,Black};

static void Main(string[] args)

{

Console.WriteLine("4种颜色的球中取出3个不同色的球所有取法：");

int count = 0;

for(int i=0;i<4;i++)

for(int j=0;j<4;j++)

for (int k = 0; k < 4; k++)

{

if (i != j && i != k && k != j)

{

Console.WriteLine("{0}\t{1}\t{2}\t", (Colors)i, (Colors)j, (Colors)k);

count++;

}

}

Console.WriteLine("一共有{0}取法",count);

Console.ReadKey();

}

}

}

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//写的错误或者不好的地方请多多指导，可以在下面留言或者给我发邮件，指出我的错误以及不足，以便我修改，更好的分享给大家，谢谢。

author:royalchen

Email:royalchen@royalchen.com

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