四则运算文件版实验总结

import java.io.*;
import java.util.Scanner;
public class test2{
  
   public static void main(String [] args)throws IOException
   { 
       PrintStream ps = null;
      int [] c=new int[150];//创建存放答案的数组
      try 
      {  
          FileOutputStream fos = new FileOutputStream("D:\test.txt");
          ps = new PrintStream(fos);
          for(int i=0;i<100;i++)
      {     ps.print("第"+(i+1)+"题  ");
       int a= (int)(Math.random()*100);
        int b=(int)(Math.random()*100);
      
      switch((int)(Math.random()*4))
      {//将题目输入到文档中并将正确答案存入数组
      case 0:ps.println(a+"+"+b+"=");c[i]=a+b;
             ps.println("**************");break;
      case 1:if(a<b) 
             {int t=a;a=b;b=t;} 
           ps.println(a+"-"+b+"=");c[i]=a-b;
           ps.println("***************");break;
      case 2:ps.println(a+"*"+b+"=");c[i]=a*b;
             ps.println("***************");break;
      case 3:while(b==0)
            b= (int)(Math.random()*100);
           ps.println(a+"/"+b+"=");c[i]=a/b;
           ps.println("***************"); break;
       }
     }
     
      }catch (IOException ioe) {
          ioe.printStackTrace(ps);
      } finally {
          ps.close();
      }
      
        Scanner in=new Scanner(System.in);
      BufferedReader br = null;
      int [] d=new int[100];
      System.out.println("请输入要做题的个数：");
      int n=in.nextInt();
     int m=0;
     try
     {
         br = new BufferedReader(new FileReader("D:\test.txt"));
         String line=br.readLine();
     for(int i=0;i<2*n;i++)//将题目从文档中输出
     {
         System.out.println(line);
         
         if(!(line.equals("***************")))
         {  //将所做答案存入另一个数组
             d[m]=in.nextInt();
             m++;
         }
         line=br.readLine();
     }
     }catch(IOException e) {
           e.printStackTrace();
     }
     int q=0;
     for(int j=0;j<n;j++)
     {     //所做答案与正确答案相比较
         if(d[j]==c[j])
          {   q++;  } 
     }
     int n1=n-q;
     System.out.println("共答"+n+"题，答对"+q+"题，答错"+n1+"题.");
     
   }

  }