jsp计算器

<%@page import="jdk.nashorn.internal.ir.RuntimeNode.Request"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>


<title>jsp计算器</title>

</head>

<body>

<h2>简单计算器</h2>

<form action="" method="post" name="form">

<input type="text" name="num1">

<Select name="operator">

<Option value="+">+

<Option value="-">-

<Option value="*">*

<Option value="/">/

</Select>
<input type="text" name="num2"> =

<br />

<br />
<input type="submit" value ="计算" name="submit">

</form>

<%

String num1=request.getParameter("num1");

String num2=request.getParameter("num2");

String operator=request.getParameter("operator");

float res=0f;
if(num1!=null && num2!=null){
float a=Float.parseFloat(num1);

float b=Float.parseFloat(num2);
if(operator.equals("+")){

res=a+b;
}

else if(operator.equals("-")){

res=a-b;

}
else if(operator.equals("*")){

res=a*b;

}

else

res=a/b;
}
%>
<p>结果为:<%= res %> </p>