c#程序设计教程（李春葆第三版）第五章上机实验

1

using System;
using System.Collections.Generic;
using System.Text;

namespace experment5_1
{
class Student //学生类
{
int sno; //学号
string sname; //姓名
Course[] course; //Course类对象数组
int[] score; //课程成绩数组
double sgpa1; //常见GPA值
double sgpa2; //标准GPA值
public int psno //psno属性可读可写
{
get
{ return sno; }
set
{ sno = value; }
}
public string psname //psname属性可读可写
{
get
{ return sname; }
set
{ sname = value; }
}
public void setcourse(params Course[] course1) //设置课程
{
course = new Course[course1.Length];
for (int i = 0; i < course1.Length; i++)
course[i] = course1[i];
}
public void setscore(int[] score1) //设置分数
{
score = new int[score1.Length];
for (int i = 0; i < score1.Length; i++)
score[i] = score1[i];
}
public void computegpa() //根据课程的学分以及学生成绩计算GPA
{
int i;
double s, sumc = 0, sumgpa1 = 0, sumgpa2 = 0;
for (i = 0; i < score.Length; i++)
{
if (score[i] >= 90)
s = 4.0; //点数
else if (score[i] >= 80)
s = 3.0;
else if (score[i] >= 70)
s = 2.0;
else if (score[i] >= 60)
s = 1.0;
else
s = 0.0;
sumgpa1 += course[i].pcredits * s;
sumgpa2 += course[i].pcredits * score[i];
sumc += course[i].pcredits;
}
sgpa1 = sumgpa1 / sumc;
sgpa2 = sumgpa2 * 4 / sumc / 100;
}
public void dispstud() //输出学生信息
{
Console.WriteLine(“学号:{0}\t姓名:{1}”, sno, sname);
Console.WriteLine(" 课程名\t学分\t分数");
for (int i = 0; i < course.Length; i++)
Console.WriteLine(" {0}\t{1}\t{2}", course[i].pcname, course[i].pcredits, score[i]);
}
public void dispgpa() //输出GPA
{
Console.WriteLine(“常见算法GPA={0:n},标准算法GPA={1:n}”, sgpa1, sgpa2);
}
}
class Course //课程类
{
string cname; //课程名
int credits; //课程学分
public Course() { }
public Course(string name, int xf) //构造函数
{
cname = name;
credits = xf;
}
public string pcname //pcname属性，课程名可读可写
{
get
{ return cname; }
set
{ cname = value; }
}
public int pcredits //pcredits属性，课程学分可读可写
{
get
{ return credits; }
set
{ credits = value; }
}
}
class Program
{
static void Main(string[] args)
{
Course[] course1 = new Course[] {new Course(“课程1”,4),new Course(“课程2”,3),
new Course(“课程3”,2),new Course(“课程4”,6),new Course(“课程5”,3)};
int[] score1 = new int[] { 92, 80, 98, 70, 89 };
Student s1 = new Student();
s1.psno = 1; s1.psname = “王华”;
s1.setcourse(course1);
s1.setscore(score1);
s1.computegpa();
s1.dispstud();
s1.dispgpa();
}
}
}

2

using System;
using System.Collections.Generic;
using System.Text;

namespace experment5_2
{
public delegate void EndExamType(DateTime endtime, Student stud); //声明完成考试委托类型
public delegate void StartExamType(DateTime starttime); //声明开始考试委托类型
public class Student //学生类
{
private string name; //学生姓名
public event EndExamType EndExam; //定义完成考试事件
public Student(string name) //构造函数
{
this.name = name;
}
public string pname //学生姓名属性
{
get { return name; }

    }
    public void Testing(DateTime begintime) //学生开始考试事件调用的方法
    {
        Console.WriteLine("学生{0}在{1}时开始答题...", name, begintime);
    }
    public void HandIn()                //学生交卷引发完成考试事件
    {
        EndExam(DateTime.Now, this);
    }

}
class Teacher                           //教师类
{
    public event StartExamType StartExam;
    public void NotifyBeginExam()
    {
        Console.WriteLine("教师宣布开始考试");
        StartExam(DateTime.Now);        //引发开始考试事件
    }
    public void Accept(DateTime accepttime, Student stud)
    {
        Console.WriteLine("  学生" + stud.pname + "完成考试,老师收卷");
    }
}
class Program
{
    static void Main(string[] args)
    {
        Teacher t = new Teacher();
        Student[] s = new Student[5];
        s[0] = new Student("张军");
        s[1] = new Student("陈华");
        s[2] = new Student("王丽");
        s[3] = new Student("许源");
        s[4] = new Student("刘畅");
        foreach (Student st in s)
        {
            t.StartExam += new StartExamType(st.Testing); //给每个学生订阅教师的开始考试事件
            st.EndExam += new EndExamType(t.Accept);      //给教师订阅每个学生的完成答卷事件
        }
        t.NotifyBeginExam();    //教师宣布开始考试
        Console.WriteLine("经过一段时间...");
        s[1].HandIn();      //一学生完成答题交卷
        Console.WriteLine("经过一段时间...");
        s[2].HandIn();      //一学生完成答题交卷
        Console.WriteLine("经过一段时间...");
        s[4].HandIn();      //一学生完成答题交卷
        Console.WriteLine("经过一段时间...");
        s[0].HandIn();      //一学生完成答题交卷
        Console.WriteLine("经过一段时间...");
        s[3].HandIn();      //一学生完成答题交卷
    }
}

}