Operators in Salesforce



<apex:page >
<apex:form id="frm">
<apex:sectionHeader title="Operators" subtitle="calc"/>
    <apex:pageBlock id="pb" title="calc">
        <apex:pageBlockSection columns="6" id="pbs">
            <apex:inputText id="first"/>
            <apex:selectList id="ope" size="1" onchange="addi()">
                <apex:selectOption itemLabel="+" itemValue="+"></apex:selectOption>
                <apex:selectOption itemLabel="-" itemValue="-"></apex:selectOption>
                <apex:selectOption itemLabel="*" itemValue="*"></apex:selectOption>
                <apex:selectOption itemLabel="/" itemValue="/"></apex:selectOption>
            </apex:selectList>
            <apex:inputText id="second"/>
            =<apex:inputText id="res" disabled="true"/>            
            <apex:commandButton value="Answer" onclick="cal()" reRender="none"/>
        </apex:pageBlockSection>
    </apex:pageBlock>
   
       <script>
       function addi()
       {
        var x = document.getElementById("{!$Component.frm.pb.pbs.first}").value;
           var y = document.getElementById("{!$Component.frm.pb.pbs.second}").value
       var z = document.getElementById("{!$Component.frm.pb.pbs.ope}").selectedIndex;        
           var a = document.getElementById("{!$Component.frm.pb.pbs.ope}").options[z].text;
            var b = document.getElementById("{!$Component.frm.pb.pbs.res}");
       //alert(a);
      if(a == "+"){
         
               var c  = parseInt(x) + parseInt(y);
           
               b.value = c;
           }
         
           else if(a == "-"){
         
               var c  = parseInt(x) - parseInt(y);
             
               b.value = c;
           }
         
           else if(a == "*"){
         
               var c  = parseInt(x) * parseInt(y);
             
               b.value = c;
           }
         
           else if(a == "/"){
         
               var c  = parseInt(x) / parseInt(y);
             
               b.value = c;
               }
               }
       
        function cal(){
           
           var x = document.getElementById("{!$Component.frm.pb.pbs.first}").value;
           var y = document.getElementById("{!$Component.frm.pb.pbs.second}").value;
           var z = document.getElementById("{!$Component.frm.pb.pbs.ope}").selectedIndex;        
           var a = document.getElementById("{!$Component.frm.pb.pbs.ope}").options[z].text;
           var b = document.getElementById("{!$Component.frm.pb.pbs.res}");
         
         
           if(a == "+"){
         
               var c  = parseInt(x) + parseInt(y);
           
               b.value = c;
           }
         
           else if(a == "-"){
         
               var c  = parseInt(x) - parseInt(y);
             
               b.value = c;
           }
         
           else if(a == "*"){
         
               var c  = parseInt(x) * parseInt(y);
             
               b.value = c;
           }
         
           else if(a == "/"){
         
               var c  = parseInt(x) / parseInt(y);
             
               b.value = c;
           }
        }
     
       </script>
</apex:form>
</apex:page>

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