Simple Apex class

Simple Apex class to perform addition and subtraction based on the button u have clicked.

Public class Example

{

public Integer bvalue{get;set;}

public Integer avalue{get;set;}

Public integer result{get;set;}

Public String operation{get;set;}

public pageReference subb()

{

rsult='Subtraction';

return null;

    }

Public pageReference add()

 {

result=avalue+bvalue;

operation='Addition';

return null;

  }

 }

<apex:page controller="Example">

<apex:form>

<apex:pageBlock title="calculatior">

<apex:pageBlockSection columns="1" title="simple operations" collapsible="false">

<apex:pageBlockSectiomItem>

<apex:outputLabel> Enter A value</apex:outputLabel>

<apex;inputText value="{!avalue}"/>

</apex:pageBlockSectionItem>

<apex:pageBlockSectiomItem>

 <apex:outputLabel> Enter B value </apex:outputLabel>

<apex;inputText value="{!bvalue}"/>

</apex:pageBlockSectionItem>

<apex:pageBlockSectiomItem>

  <apex:outputLabel>you have performed{!operation} of {!avalue} and {!bvalue} and result is {!result} </apex:outputLabel>

</apex:pageBlockSectionItem>

<apex:pageBlockSection>

</apex:pageBlock>

</apex:form>

</apex:page>