四则运算
程序设计思想：先定义一个.java类，通过随机数函数，来产生试题，产生试题的函数为string类型，最后返回表达式。然后创建HTML和JSP文件，
用于编写登录界面可以选择试题数量及考试时间。然后在编写判断正确率的一个文件，用于判断所答试题的正确率。
代码：
jisuan.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title style="color:red">四则运算</title>
<meta charset="UTF-8">
</head>
<body style="font-size:20px" background="D:\tupian\yuyu.jpg">
<center>
<h1 style="color:red">四则运算</h1>
<form action="jisuancheck.jsp" method="get">
<table style="font-size:30px">
<tr>
<td> 请选择测试时间：</td>
<td><input type="radio" name="time" value="1">1分钟
<input type="radio" name="time" value="5" >5分钟
<input type="radio" name="time" value="10">10分钟
</td>
</tr>
<tr>
<td>请选择测试的题目数量:</td>
<td>
<select name="number">
<option value="30">30</option>
<option value="40">40</option>
<option value="50">50</option>
<option value="60">60</option>
</select>
</td>
</tr>
<tr>
<td>
<center>
<input type = "submit" value = ""style="margin-top:150px;width:250px;height:250px;
background:url(D:/tupian/op.png);background-size:250px 250px;
border-style:none;"/>
</center>
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
jisuan.java
package yu;
import java.util.Scanner;
public class jisuan{
int e1;
int e2;
int e3;
int e4;
int e5;
int e0;
int k;
public String showQuestion() {
int a;
int b;
int c;
int d;
Scanner sc = new Scanner(System.in);
a=(int) (Math.random()*100);
b=(int) (Math.random()*100);
c=(int) (Math.random()*100);
d=(int) (Math.random()*6);
if(d==1) {
while(a+b+c>100) {
a=(int) (Math.random()*100);
b=(int) (Math.random()*100);
c=(int) (Math.random()*100);
}
e1=a+b+c;
k=e1;
return (a+"+"+b+"+"+c);
}
if(d==2) {
while(a-b-c<0) {
a=(int) (Math.random()*100);
b=(int) (Math.random()*100);
c=(int) (Math.random()*100);
}
e2=a-b-c;
k=e2;
return (a+"-"+b+"-"+c);
}
if(d==3) {
while(a+b-c<0||a+b>100) {
a=(int) (Math.random()*100);
b=(int) (Math.random()*100);
c=(int) (Math.random()*100);
}
e3=a+b-c;
k=e3;
return (a+"+"+b+"-"+c);
}
if(d==4) {
while(a-b<0||a-b+c>100) {
a=(int) (Math.random()*100);
b=(int) (Math.random()*100);
c=(int) (Math.random()*100);
}
e4=a-b+c;
k=e4;
return (a+"-"+b+"+"+c);
}
if(d==5) {
while(a*b>100) {
a=(int) (Math.random()*100);
b=(int) (Math.random()*100);
c=(int) (Math.random()*100);
}
e5=a*b;
k=e5;
return a+"*"+b;
}
if(d==0) {
while(a%b!=0) {
a=(int) (Math.random()*100);
b=(int) (Math.random()*100+1);
c=(int) (Math.random()*100);
}
e0=a/b;
k=e0;
return a+"÷"+b;
}
return null;
}
public int kk() {
return k;
}
}
jisuancheck.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%@page import = "yu.jisuan" %>
<html>
<head>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>四则运算出题界面</title>
<% int num = 0;
request.setCharacterEncoding("utf-8");
if(request.getParameter("number")!=null){
num=(Integer.parseInt(request.getParameter("number")));
}%>
</head>
<body background="D:\tupian\yu.jpg">
<div id="timer" style="color:red"></div>
<center>
<form id="myForm" action="jieguo.jsp" method = "get">
<table border="1" >
<tr>
<td>题号</td>
<td>题目</td>
<td>答案</td>
</tr>
<jsp:useBean id="js" class="yu.jisuan"/>
<%
jisuan kt[] = new jisuan[60];
String sk2="";
int i;
for(i=0;i<num;i++){
kt[i]=new jisuan();
%>
<tr>
<td><%=i+1 %></td>
<td><%=kt[i].showQuestion() %></td>
<td width="50px">=<input name="result" id="a<%=i + 1%>"
width="8px" style="width: 30px"></td>
<td><div id="r<%=i + 1%>"></div></td>
</tr>
<%
sk2 +=kt[i].kk() +"/";
session.setAttribute("right", sk2);
}
%>
<tr>
<td colspan="3" align="right">
<input type = "submit" value = "完成"/>
</td>
</tr>
</table>
<% int tm = 0;
request.setCharacterEncoding("utf-8");
if(request.getParameter("time")!=null){
tm=(Integer.parseInt(request.getParameter("time")));
}%>
<script type="text/javascript">
var maxtime = "<%=tm*60%>";
// 半个小时，按秒计算，自己调整!
function CountDown(){
if(maxtime>=0){
var minutes = Math.floor(maxtime/60);
var seconds = Math.floor(maxtime%60);
var msg = "距离结束还有"+minutes+"分"+seconds+"秒";
document.all["timer"].innerHTML=msg;
if(maxtime == 1*30) alert('注意，还有半分钟!');
--maxtime;
}
else{
clearInterval(timer);
alert("时间到，结束!");
}
}
timer = setInterval("CountDown()",1000);
setTimeout('window.location="jieguo.jsp"',maxtime*1000);
setTimeout( "submitFun()", maxtime*1000 );
function submitFun() {
document.getElementById("myForm").submit();
}
</script>
</form>
</center>
</body>
</html>
jieguo.jsp
<%@page import = "yu.jisuan" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<body background="D:\tupian\jiayou.jpg">
<center>
<%
String result[] = request.getParameterValues("result");
String str = (String)session.getAttribute("right");
String[] right = str.split("/");
int countright = 0;
double cod;
for(int i=0;i<right.length;i++)
{
if(right[i].equals(result[i]))
{
out.println("第"+(i+1)+"题回答正确！");
countright++;
}
else
{
out.println("第"+(i+1)+"题回答错误！正确答案为："+right[i]);
}
%>
<br>
<%
}
%>
<%
cod=countright;
cod=cod/30*100;
%>
<%="共答对了"+countright+"道题"%>
<%="正确率为"%>
<%=cod+"%" %>
<br>
<td><a href = "jisuan.html">返回选择界面</a>
</center>
</body>
</html>
截图：
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