Addition and of multiplication 3 numbers 

        
	<!doctype html>
<html>
   <head>
       <title>Addition and of multiplication 3 numbers</TITLE>
   </HEAD>
   <body>
<h1>Addition and of multiplication 3 numbers</h1>
       <form name="f1">
           Enter first number:<input type="number" name="nnum1"><br>
           Enter second number:<input type="number" name="nnum2"><br>
           Enter third number:<input type="number" name="nnum3"><br>
           <input type="submit" value="Calculate" onClick="calculate()">
       </form>
    </body>
    <script language="Javascript">
          function calculate()
          {
              event.preventDefault();
              var n1,n2,n3,add,mult;
              n1=parseInt(f1.nnum1.value);
              n2=parseInt(f1.nnum2.value);
              n3=parseInt(f1.nnum3.value);
              add=n1+n2+n3;  
              mult=n1*n2*n3; 
  document.writeln("<br>Addition of entered three numbers="+add+"<br>multiplication of entered 3 numbers="+mult);
          }
     </script>
</html>

Enter first number:
Enter second number:
Enter third number:

Go back