<HTML>
<HEAD><TITLE> Add three numbers - Happy Codings :-) C++, C#, HTML, Java, JavaScript Code Examples</TITLE>
<SCRIPT> 
   function addThreeNums (inOne, inTwo, inThree) { 
      var inOne = Number(inOne); 
      var inTwo = Number(inTwo); 
      var inThree = Number(inThree); 
      return Number(inOne + inTwo + inThree); 
   } 
   </SCRIPT>
</HEAD>
<BODY>
<FORM Name="theForm">
<INPUT Type=Text Name="num1">
<INPUT Type=Text Name="num2">
<INPUT Type=Text Name="num3">
<INPUT Type=Button Value="Add Them" 
         onClick='document.write("The sum of the three numbers is " + 

addThreeNums(theForm.num1.value,theForm.num2.value,theForm.num3.value));'>
</FORM>
</BODY>
</HTML>