11-15课堂测试

/*
 * 信1705-2 谢培龙 20173611
 */
package 自主出题;

import java.io.File;
import java.io.FileOutputStream;
import java.util.Random;
import java.util.Scanner;

public class Test{
    public static String s3;
    public void writeToFile(String data){//写入
         byte[] sourceByte = data.getBytes();
         String path = "D:";
         String fileName = "test.txt";
         if(null != sourceByte){
             try {
                 File file = new File(path+fileName);//文件路径（路径+文件名）
                 if (!file.exists()) {   //文件不存在则创建文件，先创建目录
                     File dir = new File(file.getParent());
                     dir.mkdirs();
                     file.createNewFile();
                 }
                 FileOutputStream outStream = new FileOutputStream(file); //文件输出流将数据写入文件
                 outStream.write(sourceByte);
                 outStream.close();
             } catch (Exception e) {
                 e.printStackTrace();
                 // do something
             } finally {
                 // do something
             }
         }
     }
    public static void main(String[] args){
        int grade=0;
        Test l=new Test(); 
        System.out.println("输入题数：");
        Scanner in=new Scanner(System.in);
        int a1=in.nextInt();
        StringBuffer f = new StringBuffer();
        for(int i=0;i<a1;i++) {
            
    Random a=new Random();
     int q=a.nextInt(100);
    Random b=new Random();
    int w=b.nextInt(100);
    char c = 0;
    int sum=0;
    int x=(int)Math.floor(Math.random()*4+1);
    if(x==1)
    {
        c=‘+‘
;sum=q+w;
        }
    if(x==2)
    {
        c=‘-‘
;    
        sum=q-w;}
    if(x==3)
{
    c=‘*‘
;    sum=q*w;}
    
    if(x==4)
{
    c=‘/‘;    
    sum=q/w;
}
    
System.out.println(q);
    
    System.out.println(c);
    System.out.println(w);
    System.out.println("=");
    Scanner result=new Scanner(System.in);
    int r=result.nextInt();
    if(r==sum) {
        System.out.println("恭喜答对了! ");
     grade=grade+1;}
    else System.out.println("很遗憾 答错了! ");
    String s=String.valueOf(q);
    String s1=String.valueOf(c);
    String s2=String.valueOf(w);
    String s0=String.valueOf(sum);
    String s5=s+s1+s2+"="+s0+"*"+"\t";

    
    
    s3 =s5+s3;
}
        System.out.println("答对了"+grade+"道题");
        l. writeToFile(s3);
        }
}