JSP简单计算器

来源：互联网发布：c语言的编译器有哪些编辑：程序博客网时间：2024/09/21 06:35
<body>  <%double num1=0,num2=0,add=0;int flag=0;         String tNum1=request.getParameter("in1");      String tNum2=request.getParameter("in2");      String tFlag=request.getParameter("flag");      if(tFlag!=null &&!tFlag.equals("")){         flag=Integer.parseInt(tFlag);      }      if(tNum1!=null && tNum2!=null && !tNum1.equals("") && !tNum2.equals("")){        num1=Double.parseDouble(tNum1);        num2=Double.parseDouble(tNum2);        switch(flag){            case 0:add=num1+num2;break;            case 1:add=num1-num2;break;            case 2:add=num1*num2;break;            case 3:if(num2==0)                        add=0;                    else                        add=num1/num2;                    break;              }            }   %>     <form action="" method="post">    <input type="text" name="in1" value="<%=num1 %>"/>    <%switch(flag){        case 0:    %>    <select name="flag">        <option value="0" selected>+</option>        <option value="1" >-</option>        <option value="2" >*</option>        <option value="3"> /</option>    </select>   <%   break;   case 1:    %>    <select name="flag">        <option value="0" >+</option>        <option value="1"  selected>-</option>        <option value="2" >*</option>        <option value="3"> /</option>    </select>    <%  break;   case 2:    %>    <select name="flag">        <option value="0" >+</option>        <option value="1" >-</option>        <option value="2" selected >*</option>        <option value="3"> /</option>    </select>     <% break;   case 3:    %>    <select name="flag">        <option value="0" >+</option>        <option value="1" >-</option>        <option value="2" >*</option>        <option value="3" selected> /</option>    </select>   <%}%>    <input type="text" name="in2" value="<%=num2 %>"/>    <input type="submit" name="dengyu" value="="/>    <input type="text" value="<%=add %>"/>    </form>  </body>
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