结对 四则运算
编译环境：eclipse
开发人员：de
开发时间:2015-04-07
实现功能：
1.基本的加减乘除
2.每次出1道题目，提交后会显示是否答对，如果错了，还会出现正确答案
3.题目是随机的
4.能出于分数相关的运算以及可以输入真分数
5.可以控制题目的数量
缺点：
1.分数计算的答案输入分数格式才显示正确
2.不能用户选择做什么运算
3.还不能统计答题的时间
4.不能统计答题正确的数目
......
个人体会：
1.能力还是不足，一些东西想到了却不能实现
2.要多点和伙伴讨论
3.对于Java的基础不够熟
伙伴的博客链接：http://www.cnblogs.com/zsb1/
界面：
测试结果：
源代码：
package rjgc;
import java.io.*;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.*;
import java.util.regex.Pattern;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.math.*;
public class Rj11 {
public static void main(String[] args) {
MyFrame frame=new MyFrame();
}
}
class MyFrame extends JFrame{
private JLabel L1=new JLabel("题目数");
private JLabel L2=new JLabel("题目是");
private JLabel L3=new JLabel("答案是");
JTextField T1 = new JTextField(15);
JTextField T2 = new JTextField(15);
JTextField T3 = new JTextField(5);
JTextField T4 = new JTextField(20);
JButton B4=new JButton("确定");
JButton B1=new JButton("开始");
JButton B2=new JButton("提交");
JButton B3=new JButton("下一题");
MyFrame(){
this.setTitle("求平方");
this.setSize(400, 250);
this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
this.getContentPane().setBackground(Color.white);
FlowLayout flow=new FlowLayout(FlowLayout.LEFT,10,15);
this.setLayout(flow);
B4.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
Pattern pa = Pattern.compile("[0-9]*");
String s1=T1.getText();
if(pa.matcher(s1).matches())//检测用户输入是否正确
{
try
{
int number=Integer.parseInt(s1);
File dir=new File("d:number");
if(!dir.exists())
{
dir.mkdir();
}
File afile=new File(dir,"data.txt");
afile.createNewFile();
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(String.valueOf(s1));
bw.close();
}
catch(IOException t)
{
T4.setText("IO exception thrown:"+t);
}
}
else
{
T1.setText("输入的格式错误请重新输入!");
}
}
});
B1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent y){
DecimalFormat df=new DecimalFormat("#.00");
df.setRoundingMode(RoundingMode.HALF_UP);
char[]ch={‘+‘,‘-‘,‘*‘,‘/‘};
int c = 0;
int d=0;
int h=0;
int f=0;
int e=0;
double answer;
double ans;
int right=0;
int number;
try
{
File dir1=new File("d:number");
File afile1=new File(dir1,"data.txt");
BufferedReader br1=new BufferedReader(new InputStreamReader(new FileInputStream(afile1)));
String strRead1=br1.readLine();
number=Integer.parseInt(strRead1);
if(number>=1)
{
int n = new Random().nextInt(5);//获取运算的方式0—— + 1—— - 2—— * 3—— /
if(n==0 || n==2 || n==3 || n==1)//int型的运算
{
double a1 = new Random().nextDouble()*100;//获取式子的运算随机数
double a=Double.parseDouble(df.format(a1));
double b1 =new Random().nextDouble()*100+1;//除数不能为0
double b=Double.parseDouble(df.format(b1));
T2.setText(a+""+ch[n]+""+b+"=");//输出式子
if(n==0)//加法
{
answer=a+b;
answer=Double.parseDouble(df.format(answer));//保留两位小数
String dirName1="d:MyData";
try
{
File dir=new File(dirName1);
if(!dir.exists())
{
dir.mkdir();
}
File afile=new File(dir,"data.txt");
afile.createNewFile();
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(String.valueOf(answer));
bw.close();
}
catch(IOException t)
{
T4.setText("IO exception thrown:"+t);
}
}
else if(n==1)//减法
{
answer=a-b;
answer=Double.parseDouble(df.format(answer));//保留两位小数
String dirName1="d:MyData";
try
{
File dir=new File(dirName1);
if(!dir.exists())
{
dir.mkdir();
}
File afile=new File(dir,"data.txt");
afile.createNewFile();
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(String.valueOf(answer));
bw.close();
}
catch(IOException t)
{
T4.setText("IO exception thrown:"+t);
}
}
else if(n==2) //乘法
{
answer=a*b;
answer=Double.parseDouble(df.format(answer));//保留两位小数
String dirName1="d:MyData";
try
{
File dir=new File(dirName1);
if(!dir.exists())
{
dir.mkdir();
}
File afile=new File(dir,"data.txt");
afile.createNewFile();
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(String.valueOf(answer));
bw.close();
}
catch(IOException t)
{
T4.setText("IO exception thrown:"+t);
}
}
else if(n==3) //除法
{
ans=Double.parseDouble(df.format(a/b));//保留两位小数
String dirName1="d:MyData";
try
{
File dir=new File(dirName1);
if(!dir.exists())
{
dir.mkdir();
}
File afile=new File(dir,"data.txt");
afile.createNewFile();
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(String.valueOf(ans));
bw.close();
}
catch(IOException t)
{
T4.setText("IO exception thrown:"+t);
}
}
}
else if(n==4)//含有真分数的运算
{
double fm=0;
double fz=0;
double MaxD;
String str1;//最简分式
boolean t = true;
while(t==true)//判断并输出真分数
{
c = new Random().nextInt(10);
d =new Random().nextInt(10);//获取式子的运算随机数
if(c<d)
t=false;
}
t=true;
while(t==true)//判断并输出真分数
{
e =new Random().nextInt(10)+1;
f =new Random().nextInt(10);//获取式子的运算随机数
if(e<f)
t=false;
}
n=new Random().nextInt(4);
T2.setText("("+c+"/"+d+")"+ch[n]+"("+e+"/"+f+")"+"=");
if(n==0)//加法
{
fm=d*f;
fz=(c*f)+(e*d);
//简化约分
MaxD=getMaxDivi(fz,fm);//最大公约数
fz=fz/MaxD;
fm=fm/MaxD;
//double不保留小数
//简化完毕
//标准答案
str1=(int)fz+"/"+(int)fm;//得出最简答案
ans=Double.parseDouble(df.format(fz/fm));
String dirName1="d:MyData";
try
{
File dir=new File(dirName1);
if(!dir.exists())
{
dir.mkdir();
}
File afile=new File(dir,"data.txt");
afile.createNewFile();
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(str1);
bw.close();
}
catch(IOException t1)
{
T4.setText("IO exception thrown:"+t);
}
}
else if(n==1)//减法
{
fm=d*f;
fz=(c*f)-(e*d);
MaxD=getMaxDivi(fz,fm);
fz=fz/MaxD;
fm=fm/MaxD;
if(fz<0||fm<0)
{
fz=-(Math.abs(fz));
fm=Math.abs(fm);
}
str1=(int)fz+"/"+(int)fm;//正确答案的String
String dirName1="d:MyData";
try
{
File dir=new File(dirName1);
if(!dir.exists())
{
dir.mkdir();
}
File afile=new File(dir,"data.txt");
afile.createNewFile();
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(str1);
bw.close();
}
catch(IOException t1)
{
T4.setText("IO exception thrown:"+t);
}
}
else if(n==2)//乘法
{
fz=c*e;
fm=d*f;
MaxD=getMaxDivi(fz,fm);
fz=fz/MaxD;
fm=fm/MaxD;
str1=(int)fz+"/"+(int)fm;//正确答案的String
String dirName1="d:MyData";
try
{
File dir=new File(dirName1);
if(!dir.exists())
{
dir.mkdir();
}
File afile=new File(dir,"data.txt");
afile.createNewFile();
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(str1);
bw.close();
}
catch(IOException t1)
{
T4.setText("IO exception thrown:"+t);
}
}
else if(n==3)//除法
{
fz=c*f;
fm=d*e;
MaxD=getMaxDivi(fz,fm);
fz=fz/MaxD;
fm=fm/MaxD;
str1=(int)fz+"/"+(int)fm;//正确答案的String
String dirName1="d:MyData";
try
{
File dir=new File(dirName1);
if(!dir.exists())
{
dir.mkdir();
}
File afile=new File(dir,"data.txt");
afile.createNewFile();
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(str1);
bw.close();
}
catch(IOException t1)
{
T4.setText("IO exception thrown:"+t);
}
}
}
number--;
String ss=String.valueOf(number);
File dir=new File("d:number");
File afile=new File(dir,"data.txt");
BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile)));
bw.write(String.valueOf(ss));
bw.close();
}
else
{
T4.setText("");
}
}
catch(IOException t)
{
T4.setText("IO exception thrown:"+t);
}
}
});
B2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int n;
int n1;
String dirName="d:MyData";
String filename="data.txt";
String filename1="data1.txt";
try{
File dir=new File(dirName);
File afile=new File(dir,filename);
BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(afile)));
String strRead=br.readLine();
if(strRead.equals(T3.getText()))
{
T4.setText("恭喜，你答对了！");
}
else
{
T4.setText("对不起，你答错了！正确答案为："+strRead);
}
}
catch(IOException t)
{
T4.setText("IO exception thrown:"+t);
}
}
});
add(L1);add(T1);add(B4);add(B1);add(L2);add(T2);add(T3);add(B2);add(L3);add(T4);
this.setResizable(false);
this.setVisible(true);
}
static double getMaxDivi(double a,double b)//求最大公约数，运用辗转相除法
{
double maxdivd=0;
if(a==0||b==0)
{
maxdivd=1;
return maxdivd;
}
else
{
if(a<b)
getMaxDivi(b,a);
boolean value=false;
if(a==0)
{
maxdivd=1;
value=true;
}
while(value==false)
{
int n=(int) (a/b);
int m=(int) (a%b);
if(m==0)
{
maxdivd=b;
value=true;
}
else
{
a=b;
b=m;
}
}
}
return maxdivd;
}
}
时间： 2024-08-28 12:46:12