if you want more code then you have to get it here


HERE IS THE CODE


<center><p id="show">the answer will display here</p></center><input type="text" id="f" value=""/>+<input id="s" value="" type="text"/><br/><center><button onclick="change()">Get Answer</button></center>
<script>
function change(){
var x = document.getElementById('f').value; var y = document.getElementById('s').value;
var z = x * y;
if(z=="" || isNaN(z)){document.getElementById('show').innerHTML="please check if one input is empty or not a number"; alert("invalid input";}else{document.getElementById('show').innerHTML="The answer is = " + z; alert("success";}
}
</script>