You should make each different arithmetic function its own action/method/whatevertheframeworkcallsit and you should use the frameworks input validation for the form values (if it has one).
你需要为每一种运算设置单独的动作，或者说方法（每个框架的叫法不一样），而且还要用到框架中的表单验证功能（如果框架提供了这一功能的话）。
In this section, we create a Action web service web service, and access the web service using the web_client_api function and the direct instance method invocation.
在本节中，我们将创建ActionwebService web服务，并访问使用web_client_api函数的web服务和直接实例方法调用。
To enable this function, you wrap the name of each course in a h:commandLink that designates the method binding #{courseAction. selectCourse} as the action, as shown in Listing 9.
要实现这项功能，在h:commandLink 中包装各个课程的名称，h:commandLink 将方法绑定 #{courseAction.selectCourse} 指派成操作，如清单9 所示。
The paper analyzes mechanism of action and load transfer under group anchor, calculates load transfer-displacement by shearing displacement-transfer function method.
通过对群锚作用下的作用机理、荷载传递进行分析，使用剪切位移—传递函数法进行荷载传递位移计算。
It has assembled many function modules in the method of Master-Slave Communication and can realize the harmony operation between action and voice.
它将多个功能模块采用主从式通信进行有机地组合起来，实现各种肢体动作与语言的协调运行。
By using the method of documentary, pharmacological action, toxic and side effects, clinic application and nutritional function of aloe were introduced.
采用文献资料法，从芦荟的药理作用及毒副作用、临床应用、保健作用等方面加以阐述。
This paper gives a method that instead of PT2262 a cheap microcontroller AT89C2051 carries out the function, handling the action of the switch with the software, the operation is simple and easy.
给出了用廉价单片机at89c 2051代替PT 2262实现功能的方法，用软件来处理开关的动作，操作简便易行。
This paper gives a method that instead of PT2262 a cheap microcontroller AT89C2051 carries out the function, handling the action of the switch with the software, the operation is simple and easy.
给出了用廉价单片机at89c 2051代替PT 2262实现功能的方法，用软件来处理开关的动作，操作简便易行。
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