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package edu.course_text;
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import java.util.Scanner;
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public class System_stu {
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private static final int MaxNum=100;
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private static Score[] scoreStudent=new Score[MaxNum];
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private static int numStudent=0;
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public static void main(String[] args) {
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Scanner sc=new Scanner(System.in);
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System.out.println("*************************");
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System.out.println("***欢迎使用学生成绩管理系统***");
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System.out.println("*************************");
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ABC: while(true){
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System.out.println("以下是菜单栏");
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System.out.println("1-查看、2-添加");
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System.out.println("3-修改、4-删除");
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System.out.println("5-统计、6-查找");
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System.out.println("7-排序、0-退出");
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System.out.println("请输入你的选项:");
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String choose=sc.next();
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switch (choose){
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case "1" : displayScore();break;
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case "2" : AddScore(sc);break;
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case "3" : updateScore(sc);break;
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case "4" : deleteScore(sc);break;
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case "5" : sumScore(sc);break;
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case "6" : searchScore(sc);break;
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case "7" : sortScore(sc);break;
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case "0" : System.out.println("退出成功！");break ABC;
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default :System.out.println("没有此选项");
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}
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}
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}
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private static void displayScore(){//查询
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if(numStudent==0){
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System.out.println("尚未添加学生，请返回菜单首页添加");
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return;
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}
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System.out.println("下面为您展示学生成绩单");
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System.out.println("序号\t\t学生姓名\t学生学号\t课程名称\t课程成绩");
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for(int i=0;i<numStudent;i++){
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Score s=scoreStudent[i];
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System.out.print(s.id);
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System.out.print(s.stuName);
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System.out.print(s.stu_id);
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System.out.print(s.scoreName);
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System.out.print(s.score);
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System.out.println();
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}
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}
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private static void AddScore(Scanner scanner){//增加
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System.out.println("请输入添加的人数");
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int temp=scanner.nextInt();
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int j=numStudent;
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for(int i=j;i<j+temp;i++){
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//先创建具体数组的对象
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scoreStudent[i]=new Score();
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while(true){
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System.out.println("输入学号");
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String stu_id=scanner.next();
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boolean flag=contains(stu_id);
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if(flag){
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System.out.println("学号重复，请重新输入");
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//bug多组输入出问题,bug解决原因是循环内num没有改变
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}
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else{
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scoreStudent[i].stu_id=stu_id;
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break;
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}
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}
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System.out.println("请输入该学生的序号");
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int id=scanner.nextInt();
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scoreStudent[i].id=id;
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System.out.println("输入学生姓名");
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String name= scanner.next();
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scoreStudent[i].stuName=name;
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System.out.println("课程名称");
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String scoreName=scanner.next();
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scoreStudent[i].scoreName=scoreName;
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System.out.println("成绩");
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int score=scanner.nextInt();
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scoreStudent[i].score=score;
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numStudent++;
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}
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System.out.println("现在有"+numStudent+"人");
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}
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private static void searchScore(Scanner scanner){//查询信息
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System.out.println("请输入查询该学生的学号");
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String stu_id=scanner.next();
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boolean flag=true;
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for(int i=0;i<numStudent;i++){
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Score s=scoreStudent[i];
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if(s.stu_id.equals(stu_id)){
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System.out.println("该学生的名字为："+s.stuName);
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System.out.println("该学生的学号为："+s.stu_id);
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System.out.println("该学生的序号为："+s.id);
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System.out.println("该学生的所选课程为："+s.scoreName);
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System.out.println("该学生的课程成绩为："+s.score);
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flag=false;
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}
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}
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if(flag){
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System.out.println("没有该学生的信息，请重新输入");
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}
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}
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private static boolean contains(String stu_id){//判断是否重复
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for(int i=0;i<numStudent;i++){
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Score s=scoreStudent[i];
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if(s.stu_id.equals(stu_id)){
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return true;
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}
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}
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return false;
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}
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private static void updateScore(Scanner sc){//修改
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System.out.println("请输入该同学的学号");
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String stu_id=sc.next();
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if(!contains(stu_id)){
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System.out.println("该同学学号不存在！");
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return;
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}
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for(int i=0;i<numStudent;i++){
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Score s=scoreStudent[i];
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if(s.stu_id.equals(stu_id)){
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System.out.println("您要修改的同学的姓名为"+s.stuName);
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System.out.println("请输入该同学的新成绩");
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scoreStudent[i].score=sc.nextInt();
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}
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}
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}
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private static void deleteScore(Scanner sc){
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int k=0;
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System.out.println("请输入您有删除的学生学号");
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String stu_id=sc.next();
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if(!contains(stu_id)){
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System.out.println("您输入的学号不存在");
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return;
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}
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for(int i=0;i<numStudent;i++){
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Score s=scoreStudent[i];
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if(s.stu_id.equals(stu_id)){
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k=i;
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System.out.println("您要删除的是"+s.stuName+"同学");
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System.out.println("是否删除，输入Y或N,Y代表删除，N代表不删除");
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String temp=sc.next();
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if(temp.equals("N")||temp.equals("n")){
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System.out.println("信息没有删除");
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return;
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}
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}
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}
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for(int i=k;i<numStudent;i++){//循环判断条件-1或不减1无太大差别
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scoreStudent[i]=scoreStudent[i+1];
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}
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numStudent--;
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System.out.println("信息删除成功！");
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}
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private static void sumScore(Scanner sc){
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System.out.println("一共有"+numStudent+"人");
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int max=scoreStudent[0].score;
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int min=scoreStudent[0].score;
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double sum=0;
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for (int i = 0; i < numStudent; i++) {
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if(scoreStudent[i].score>max){
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max=scoreStudent[i].score;
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}
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if(scoreStudent[i].score<min){
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min=scoreStudent[i].score;
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}
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sum+=scoreStudent[i].score;
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}
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System.out.println("最高分为"+max);
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System.out.println("最低分为"+min);
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System.out.printf("平均分%.2f",sum/numStudent);
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}
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private static void sortScore(Scanner sc){
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for (int i = numStudent; i >0 ; i--) {
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for(int j=0;j<i-1;j++){
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Score s=new Score();
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if(scoreStudent[j].score>scoreStudent[j+1].score){
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s=scoreStudent[j];
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scoreStudent[j]=scoreStudent[j+1];
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scoreStudent[j+1]=s;
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}
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}
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}
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System.out.println("展示排序后结果");
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displayScore();
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}
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}
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class Score{
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int id;//序号
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String stuName;//学生姓名
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String stu_id;//学生学号
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String scoreName;//课程名称
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int score;//分数
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public String toString(){
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return "序号："+id+"，学号"+stu_id
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+",姓名:"+stuName+",课程名称:"+scoreName+",分数:"+score;
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}
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}
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