每日日报之一周总结

本周四则运算各项功能已全部完成。

源码如下：

package homework;
import java.util.*;
import java.util.Scanner;
import javax.script.*; 
import java.io.File;  
import java.io.InputStreamReader;  
import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.FileInputStream;  
import java.io.FileWriter;  
import java.io.IOException;
import java.io.*;
public class math 
{
	private static int n,min,max,c,cc,kh=0,xz,zts=0,zcts=0;//题目数，数值范围（最小及最大），操作数个数，乘除，括号，选择菜单，总题数，总错题数
	private static char[] d={'+','-','*','/'};//运算符
	private static Scanner sc=new Scanner(System.in);
	public static void main(String args[]){DZ();}//菜单
	public static void DZ()//菜单
	{
		System.out.println("请选择：");
		System.out.println(" 1.小学二年级口算题");
		System.out.println(" 2.小学三年级口算题");
		System.out.println(" 3.小学四年级口算题");
		System.out.println(" 4.错题本");
		xz=sc.nextInt();
		if(xz==4) {CTB();}//错题本
		else
		{
			System.out.println( "请输入题目总数：" );
		   n=sc.nextInt();
		   System.out.println("请输入数值的范围."); 
		   min=sc.nextInt();
		   max=sc.nextInt();
		   switch(xz)
		   {
		   case 1:
			   while(max>100)
			   {
				   System.out.println("小学二年级操作数范围不超过100，请重新输入最大值：");
				   max=sc.nextInt();
			   }
			   c=1;
			   break;
		   case 2:
			   while(max>1000)
			   {
				   System.out.println("小学三年级操作数范围不超过1000，请重新输入最大值：");
				   max=sc.nextInt();
			   }
			   System.out.println( "输入操作数个数：" );
		       c=sc.nextInt()-1;
		       while(c>3)
			   {
				   System.out.println("小学三年级操作数不超过4个，请重新输入操作数个数：");
				   c=sc.nextInt()-1;
			   }
		       break;
		   case 3:
			   System.out.println( "输入操作数个数：" );
		       c=sc.nextInt()-1;
		       while(c>4)
			   {
				   System.out.println("小学四年级操作数不超过5个，请重新输入操作数个数：");
				   c=sc.nextInt()-1;
			   }
		       System.out.println( "是否有括号？是请输入1,否请输入0：" );
		       kh=sc.nextInt();
		       break;
		   }
		   System.out.println( "是否有乘除法？是请输入1,否请输入0：" );
		   cc=sc.nextInt();
		   TM();//题目
		}
	}
	public static String Tm()//每题
	{
		Random r=new Random();
		int sz;
		String ch=null;
		double a=r.nextInt(max)+min;
		while(a>max){a=r.nextInt(max)+min;}
		if(xz==1)
		{
			int b;
			if(cc==0) {sz=r.nextInt(2);}
	        else{sz=r.nextInt(4);}//乘除法
			b=r.nextInt(max)+min;
		    while(b>max){b=r.nextInt(max)+min;}
		    if(d[sz]=='/')
		    {
		    	if(b==0){while(b==0||b>max) {b=r.nextInt(max)+min;}}//防止0为被除数
		    	if(a%b!=0) 
		    	{
		    		while(a%b!=0||a>max||b>max)
		    		{
		    			a=r.nextInt(max)+min;
		    			b=r.nextInt(max)+min;
		    		}
		    	}
		    }
		    if(d[sz]=='-'&&b>a){while(b>a||b>max) {b=r.nextInt(max)+min;}}
		    ch=String.valueOf(a);
		    ch+=String.valueOf(d[sz]);
		    ch+=String.valueOf(b);
		}
		else
		{
		    double[] b=new double[c];//操作数个数及数值范围
		    int k=-1,h=-1,z;//左括号，右括号
		    if(kh==1)//括号
	        {
		    	z=r.nextInt(2);
		    	if(z==1)//随机增加括号
		    	{
		    		k=r.nextInt(c-1);
		    		if(k==0)//括号由开头起
		    		{
		    			ch=String.valueOf('(');
		    			ch+=String.valueOf(a);
					    h=r.nextInt(c-1)+k+1;
					    while(h>c){h=r.nextInt(c-1)+k+1;}
					}
		    		if(k>0)//括号在式中 
		    		{
		    			ch=String.valueOf(a);
		    			h=r.nextInt(c)+k+1;
		    			while(h>c){h=r.nextInt(c)+k+1;}
		    		}
		    	}
			    else{ch=String.valueOf(a);}
		    }
		    else{ch=String.valueOf(a);}
		    for(int i=0;i<c;i++) 
		    {
		    	if(cc==0) {sz=r.nextInt(2);}
		        else {sz=r.nextInt(4);}//乘除法
			    ch+=String.valueOf(d[sz]);
			    if(k>0&&i==k-1){ch+=String.valueOf('(');}
			    b[i]=r.nextInt(max)+min;
			    while(b[i]>max){b[i]=r.nextInt(max)+min;}
			    if(d[sz]=='/'&&b[i]==0){while(b[i]==0||b[i]>max) {b[i]=r.nextInt(max)+min;}}//防止0为被除数
			    ch+=String.valueOf(b[i]);
			    if(i==h-1){ch+=String.valueOf(')');}//补“）”
			}
		}
		return ch;//以字符串形式定义算式
	}
	public static void TM()//总题
	{
		zts+=n;
		int j=0;
		String[] s=new String[n];
		while(j<n)//制作题目
		{
		    s[j]=Tm();
		    if(PC(j,s)==0)//是否重复
		    {
		    	System.out.println((j+1)+"、"+s[j]+"=");
		    	j++; 	
		    }
		}
		ScriptEngine se=new ScriptEngineManager().getEngineByName("JavaScript");
		double[] sum=new double[n];
		for(int i=0;i<n;i++)
		{
			try{sum[i]=(Double)se.eval(s[i]);} 
			catch(ScriptException e){e.printStackTrace();}
		}//字符串转算式计算结果
		DT(s,sum);//答题
	}
	public static int PC(int j,String[] s)//判重
	{
		for(int i=0;i<j;i++){if(s[i].equals(s[j])) {return 1;}}
		return 0;
	}
	public static void DT(String[] s,double[] sum)//答题
	{
		int mint,yd=0,w=0,yn=0;//时间，已答题目，错题数，yes or no
		double[] da=new double[n];//回答
		int[] cwcs=new int[n];
		double[] Da=new double[n];
		double[] Sum=new double[n];
		String[] Cw=new String[n];//错误题号
		System.out.println( "请设置答题时间（分钟）");
		mint=sc.nextInt();
		System.out.println( "开始答题 ！");
		long startTime=System.currentTimeMillis();
		while((System.currentTimeMillis()-startTime)/1000<=mint*60)
		{
		    da[yd]=sc.nextDouble();
		    yd++;
		    if(yd==n){break;}
		}
		if(yd!=n){System.out.println( "时间到！答题结束！");}
		for(int i=0;i<n;i++)
		{
			if(da[i]!=sum[i])//判断答题对错
		    {
		    	Cw[w]=s[i];
		    	Da[w]=da[i];
		    	Sum[w]=sum[i];
		    	cwcs[w]=1;
		    	w++;
		    	zcts++;
		    }
		}
		try
		{
			File f=new File("CTB.txt");
			try(FileWriter writer = new FileWriter(f,true);BufferedWriter out = new BufferedWriter(writer);)
			{
				for(int i=0;i<w;i++){out.write(Cw[i]+"="+Sum[i]+",共做错了"+cwcs[i]+"次。
");}
				out.flush();
				out.close();
			}
		}catch (IOException e) {e.printStackTrace();}
		double cw=(double)(n-w)*100/n;//正确率
		System.out.println( "你的正确率为 ：" +cw+"%");
		System.out.println( "你的错题如下 ：");//错题
		for(int i=0;i<w;i++){System.out.println((i+1)+"、"+Cw[i]+"="+Da[i]+" X"+" 正确答案:"+Sum[i]);}
		do
		{
			System.out.println("请选择：");
			System.out.println(" 1.再做一套题");
			System.out.println(" 2.错题重练");
			System.out.println(" 3.退出");
			yn=sc.nextInt();
			switch(yn)
			{
			case 1:
				TM();
				break;
			case 2:
				for(int i=0;i<w;i++)
				{
					System.out.println((i+1)+"、"+Cw[i]+"=");
					da[i]=sc.nextDouble();
					if(da[i]!=Sum[i])
					{
						cwcs[i]++;
						System.out.println((i+1)+"、X 正确答案为："+Sum[i]);
						try
				        {
							File f=new File("CTB.txt");
							BufferedReader in=new BufferedReader(new FileReader(f));
							PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f,true)));
					        String line; 
					        while ((line = in.readLine()) != null)
					        {
					        	String[] tokens = line.split(",");
					        	if(tokens[0].equals(Cw[i]+"="+Sum[i]))
					        	{
					        		out.println(line.replace(tokens[1], "共做错了"+cwcs[i]+"次。")); 
					        	}
					        }
					        in.close();
					        out.close();
				         }catch (IOException e) {e.printStackTrace();}
					}
				}
				break;
			case 3:
				System.out.println( "你今天的正确率为 ：" +(zts-zcts)*100/zts+"%"+"
");
				CTB();
				break;
			}			
		}while(yn!=3);
	}
	public static void CTB()//错题本
	{
		System.out.println("         错题本          ");
		try 
		{
			File f=new File("CTB.txt");
			InputStreamReader reader = new InputStreamReader(new FileInputStream(f));
			BufferedReader br = new BufferedReader(reader);
			String line;  
            while ((line = br.readLine()) != null){System.out.println(line);}
            br.close();
		}catch (IOException e) {e.printStackTrace();}
	}
}

功能记录：

定制式题、四则运算及括号添加、年级的限定、错题记录及重练、多套试题的限时答题、错题本等。

问题无（主要是懒。。。）