要求：
2、編寫一個類實現加、減、乘、除、取餘 <%@ page contentType="text/html;charset=gb2312"%><html><head><!-- 對的資料進行判斷 --><script language="javascript">function formcheck(){if(form1.num1.value==""||form1.num2.value==""){window.alert("不可為空！");return false;}else if(Math.round(form1.num1.value)!=form1.num1.value||Math.round(form1.num2.value)!=form1.num2.value){window.alert("只能輸入數字！");return false;}else if(form1.flag.options(3).value=="/"&&form1.num2.value==0){window.alert("0不能作為除數！");return false;}}</script></head><body><%//接收運算String flag=request.getParameter("flag");String num1=request.getParameter("num1");String num2=request.getParameter("num2");int mynum1=0,mynum2=0, result=0;//為了防止出現異常（接收到的值為null），在這裡進行處理。if(num1!=null&&num2!=null&&flag!=null){mynum1=Integer.parseInt(num1);mynum2=Integer.parseInt(num2);if(flag.equals("+")){result=mynum1+mynum2;}else if(flag.equals("-")){result=mynum1-mynum2;}else if(flag.equals("*")){result=mynum1*mynum2;}else{result=mynum1/mynum2;}}%><!-- JSP計算機的介面 --><h1>JSP計算機</h1><hr><form name="form1" action="Calc2.jsp">請輸入數字：<input type="text" name="num1" value="<%=mynum1 %>"><br><select name="flag"><option value="+" selected>+</option><option value="-">-</option><option value="*">*</option><option value="/">/</option></select><br>請輸入數字：<input type="text" name="num2" value="<%=mynum2 %>"><br><input type="submit" value="計算" onclick="return formcheck();"></form><hr><h3>運算的結果為</h3><br><%=result %><hr></body></html>
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