9.18

package daily0;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import java.util.Scanner;
public class daily1 {
    //设置时长（秒）
    static int countDownTime=10;
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);

        int a[]=new int[100];
        int b[]=new int[100];
        int result[]=new int[100];
        int answer;
        int wrong=0;
        float root=0;
      int num=1;//题目数;
        Timer timer=new Timer();
        TimerTask task=new TimerTask() {
            @Override
            public void run() {
                if(countDownTime!=0){
                    countDownTime--;
                }
            }
        };
        timer.schedule(task,0,1000);
        do{
            ti(num,result,a,b);
            num++;
            answer=sc.nextInt();
            System.out.println("剩余时间为:"+countDownTime);
            if(countDownTime==0)break;
            if(answer!=result[num-1]){
                wrong++;
                System.out.println("正确答案是:"+result[num-1]);
            }
        }
        while(num<=30);
        if(num<=30){

            for(int i=num;i<=30;i++){
                ti(num,result,a,b);
                num++;
                wrong++;
                System.out.println("正确答案是:"+result[num-1]);
            }
        }
        root=(float)(30-wrong)/30;
        System.out.println("错题数:"+wrong);
        System.out.println("正确率:"+root*100+"%");
    }
    //判断是否为负数
    public static int fu(int a){
     if(a<0)
         a=-1*a;
     if(a<10)
         a=a+10;
     return a;
    }
    //生成一个题目
    public static void ti(int num,int result[],int a[],int b[]){
        boolean check=false;
        Random r=new Random();
        a[num]=r.nextInt()%100;
        b[num]=r.nextInt()%100;
        int m=r.nextInt()%9;
        a[num]=fu(a[num]);
        b[num]=fu(b[num]);
        if(m<0){
            m=-1*m;
        }
        switch(m){
            case 0:
                for(int i=0;i<num;i++){
                    if(a[i]==a[num]&&b[i]==b[num])
                        check=true;
                }
                if(!check){
                  System.out.println(num+"、"+a[num]+"+"+b[num]+"=");result[num]=a[num]+b[num];} num++;
                break;
            case 6:
            case 1:
                for(int i=0;i<num;i++){
                    if(a[i]==a[num]&&b[i]==b[num])
                        check=true;
                }
                if(a[num]<b[num])
                    check=true;
                if(!check){
                   System.out.println(num+"、"+a[num]+"-"+b[num]+"=");result[num]=a[num]-b[num]; num++;}
                break;
            case 4:
            case 2:
                for(int i=0;i<num;i++){
                    if(a[i]==a[num]&&b[i]==b[num])
                        check=true;
                }
                if(a[num]*b[num]>1000)
                    check=true;
                if(!check){
                   System.out.println(num+"、"+a[num]+"*"+b[num]+"=");result[num]=a[num]*b[num]; num++;}
                break;
            case 8:
            case 7:
            case 5:
            case 3:
                for(int i=0;i<num;i++){
                    if(a[i]==a[num]&&b[i]==b[num])
                        check=true;
                }
                if(a[num]%b[num]!=0)
                    check=true;
                if(!check){
                   System.out.println(num+"、"+a[num]+"/"+b[num]+"=");result[num]=a[num]/b[num]; num++;}
                break;
        }
        if(check){
            ti(num,result,a,b);
        }
    }
}