Code:
<script>
function muloperator()
{
var val1 = parseInt(document.getElementById("txt1").value);
var val2 = parseInt(document.getElementById("txt2").value);
var ans=document.getElementById("demo")
}
sum()
{
ans.value = val1+ val2;
}
minus()
{
ans.value = val1 - val2;
}
mul()
{