C#.NET程序设计教程实验指导（清华大学 江红，余青松）实验源码第六章

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();

}
}
}