Java——自动生成30道四则运算---18.09.27

package chuti;
import java.io.PrintWriter;
import java.util.Scanner;
import java.io.FileNotFoundException;
class Counter
{
    private int a;
    private int b;
     public int  add(int a,int b)
     {
         return a+b;
     }
     public int   reduce(int a,int b)
     {
         return a-b;
     }
     public int   multiplication(int a,int b)
     {
         return a*b;
     }
     public int   division(int a,int b)
     {
         if(b!=0)
         return a/b;
         else return 0;
     }

    
}
public class Demo {
    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);
        Counter counter=new Counter();
        PrintWriter out = null;
        try {
            out = new PrintWriter("text.txt");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        int sum = 0;

       
       
        for (int i = 1; i <=10; i++) {
            int a = (int) Math.round(Math.random() * 100);
            int b = (int) Math.round(Math.random() * 100);
            int m= (int) Math.round(Math.random() * 3);

           
           switch(m)
           {
           case 0:
               System.out.println(i+": "+a+"/"+b+"=");
              
               while(b==0){  b = (int) Math.round(Math.random() * 100); }
              
            int c0 = in.nextInt();
            out.println(a+"/"+b+"="+c0);
            if (c0 == counter.division(a, b)) {
                sum += 10;
                System.out.println("恭喜答案正确");
            }
            else {
                System.out.println("抱歉，答案错误");
            }
           
            break;
           
           case 1:
               System.out.println(i+": "+a+"*"+b+"=");
               int c = in.nextInt();
               out.println(a+"*"+b+"="+c);
               if (c == counter.multiplication(a, b)) {
                   sum += 10;
                   System.out.println("恭喜答案正确");
               }
               else {
                   System.out.println("抱歉，答案错误");
               }
               break;
           case 2:
               System.out.println(i+": "+a+"+"+b+"=");
               int c1 = in.nextInt();
               out.println(a+"+"+b+"="+c1);
               if (c1 == counter.add(a, b)) {
                   sum += 10;
                   System.out.println("恭喜答案正确");
               }
               else {
                   System.out.println("抱歉，答案错误");
               }
              
               break ;
           case 3:
               System.out.println(i+": "+a+"-"+b+"=");
               int c2 = in.nextInt();
               out.println(a+"-"+b+"="+c2);
               if (c2 == counter.reduce(a, b)) {
                   sum += 10;
                   System.out.println("恭喜答案正确");
               }
               else {
                   System.out.println("抱歉，答案错误");
               }
               break ;

               }
   
          }
        System.out.println("成绩"+sum);
        out.println("成绩:"+sum);
         out.close();      
    }
}

 

这是一个出一个解答一个题，然后判断结束后再出下一个题，一共出30个题的代码。

记得，后面还有一个web