C#实现学生成绩管理系统

using System;using System.Collections.Generic;using System.Diagnostics;using System.Linq;using System.Text;using System.Threading.Tasks;

namespace ConsoleApplication1{class Program{static void Main(string[] args){//2. 在用户登录界面提示用户输入用户名和密码，并根据用户名和密码决定    能否登录系统。

//   3. 合法用户登陆成功后，在屏幕上显示如下功能菜单：//          1.学生成绩输入 2.学生成绩输出 3.学生成绩查询 4.学生成绩修改 0.退出系统//            提示用户输入选择号，用户输入正确的选择好后执行相应功能。执行完对应功   能后返回功能菜单。

Console.WriteLine("欢迎来到成绩管理系统！");while (true) {Console.WriteLine("***请输入账号：");String userName = Console.ReadLine();Console.WriteLine("***请输入密码：");String userPassword = Console.ReadLine();if (userName.Equals("123456") && userPassword.Equals("456789")){Console.WriteLine("***账号密码正确请进入");break;}else {Console.WriteLine("账号密码不一致，是否重新进入！[1：重新输入---2：退出]");int n = int.Parse(Console.ReadLine());while (true) {if (n == 1 || n == 2){break;}else {Console.WriteLine("***序号有误请重新输入！");n = int.Parse(Console.ReadLine());}}if (n==2) {Process.GetCurrentProcess().Kill();}}}

showView();showChoice();

StudentLinkedList link = new StudentLinkedList();

while (true) {Console.WriteLine("***请选这些序号 ");int n = int.Parse(Console.ReadLine());switch (n) {//0.退出系统case 0: {Process.GetCurrentProcess().Kill();break;}//1.学生成绩输入case 1: {Console.WriteLine("***请输入ID账号：");int id = int.Parse(Console.ReadLine());Console.WriteLine("***请输入姓名：");String name = Console.ReadLine();Console.WriteLine("***请输入成绩：");int score = int.Parse(Console.ReadLine());link.add(getStudentNode(id, name, score));break;}//2.学生成绩输出case 2: {link.show();break;}// 3.学生成绩查询case 3:{Console.WriteLine("***请输入你要查找的id账号");int index = int.Parse(Console.ReadLine());Student student=link.search(index);Console.WriteLine(student.toString());break;}//4.学生成绩修改case 4:{Console.WriteLine("***[注]：只能修改成绩！");Console.WriteLine("***请输入你要修改的id账号");int index = int.Parse(Console.ReadLine());Console.WriteLine("***请输入你要修改的id分数");int score = int.Parse(Console.ReadLine());link.upThis(index, score);break;}case 5:{Console.WriteLine("***请输入你要删除的id账号");int index = int.Parse(Console.ReadLine());link.delete(index);break;}default: {break;}

}showChoice();}Console.ReadKey();}

//获取节点对象public static StudentNode getStudentNode(int id,String name,int score ) {return new StudentNode(new Student(id,name,score));}

//启动界面// 1.学生成绩输入 2.学生成绩输出 3.学生成绩查询 4.学生成绩修改 0.退出系统public static void showView() {Console.WriteLine("|----------------------------程序启动---------------------------|");Console.WriteLine("|\t\t\t学生成绩管理系统\t\t\t|");Console.WriteLine("|---------------------------------------------------------------|");Console.WriteLine("|\t\t\t开发人姓名：马志勇\t\t\t|");Console.WriteLine("|\t\t\t开发时间：2020-20-14\t\t\t|");Console.WriteLine("|\t\t\t按任意键进入系统\t\t\t|");Console.WriteLine("|---------------------------------------------------------------|");}public static void showChoice() {Console.WriteLine("|---------------------------------------------------------------|");Console.WriteLine("|\t\t\t0.退出系统\t\t\t\t|");Console.WriteLine("|\t\t\t1.学生成绩输入\t\t\t\t|");Console.WriteLine("|\t\t\t2.学生成绩输出\t\t\t\t|");Console.WriteLine("|\t\t\t3.学生成绩查询\t\t\t\t|");Console.WriteLine("|\t\t\t4.学生成绩修改\t\t\t\t|");Console.WriteLine("|\t\t\t5.删除这个学生\t\t\t\t|");Console.WriteLine("|---------------------------------------------------------------|");}

}

class StudentLinkedList{//定义一个头结点啥都不放StudentNode head = null;public StudentLinkedList() {head=new StudentNode(null);}//添加 按照学号顺序顺序进行添加//如果学号相同则不能添加public void add(StudentNode node){if (head.next == null){head.next = node;return;}//否则定义一个变量临时变量进行处理；

StudentNode temp = head;int id = node.s.getId();bool flag = false;while (true){if (temp.next == null){flag = false;break;}if (temp.next.s.getId() > id){flag = false;break;}else if (temp.next.s.getId() == id){//这个情况是有重复的就不能添加进去flag = true;break;}temp = temp.next;}if (flag){Console.WriteLine("这个序号已经存在");}else {node.next=temp.next;temp.next = node;}}

//删除//只能通过id进行删除public bool delete(int id) {if (head.next==null) {return false;}StudentNode temp = head;while (true) {if (temp.next==null) {return false;}

if (temp.next.s.getId()==id) {break;}temp = temp.next;}if (temp.next.next != null){temp.next = temp.next.next;}else {temp.next = null;}

return true;}

//修改//只能修改成绩public void upThis(int id,int score) {if (head.next == null){Console.WriteLine("没有数据，无法修改！");return;}StudentNode temp = head.next;while (true) {if (temp==null) {Console.WriteLine("没有这个ID数据!");return;}if (temp.s.getId()== id) {temp.s.setScore(score);return;}temp = temp.next;}}

//查询public Student search(int id){if (head.next == null){Console.WriteLine("没有数据，无法修改！");return null;}StudentNode temp = head.next;while (true){if (temp == null){Console.WriteLine("没有这个ID数据!");return null;}if (temp.s.getId() == id){return new Student(temp.s.getId(), temp.s.getName(), temp.s.getScore());}temp = temp.next;}}

//遍历public void show() {Console.WriteLine("ID\t\t姓名\t\t分数");StudentNode temp = head.next;while (true) {if (temp==null) {break;}Console.WriteLine(temp.s.getId()+"\t\t"+temp.s.getName()+"\t\t"+temp.s.getScore());temp = temp.next;}}}

//创建一个链表进行处理这些数据class StudentNode{public Student s;public StudentNode next;public StudentNode(Student s){this.s = s;}}//定义学生类class Student{private int id;private String name;private int score;public Student(int id, String name, int score){this.id = id;this.name = name;this.score = score;}

public void setId(int id){this.id = id;}public int getId(){return this.id;}

public String getName(){return this.name;}

public void setName(String name){this.name = name;}

public int getScore(){return this.score;}

public void setScore(int score){this.score = score;}

public String toString() {return "ID:"+getId() + "\t姓名：" + getName() + "\t成绩：" + getScore();}}

//这是用户类class User{private String userName;private String userParsword;public User(String userName, String userParsword){this.userName = userName;this.userParsword = userParsword;}public String getUserName(){return this.userName;}

public void setName(String userName){this.userName = userName;}

public String getUserParsword(){return this.userParsword;}