<html>
<script>
function myFunction() {
var y =parsefloat( document.getElementById("txt1").value);
var z =parsefloat( document.getElementById("txt2").value);
var s =parsefloat(document.getElementById("txt3").value);
var x = y + z + s;
document.getElementById("demo").innerHTML = x;
}
</script>
<p>
Click the button to calculate x.
<button onclick="myFunction()">Try it</button>
</p>
<p>
Enter first number:
<input type="text" id="txt1" name="text1" value="1">
Enter second number:
<input type="text" id="txt2" name="text2" value="2">
enter third number:
<input type="text" id="txt3" name="text3" value="3">
</p>
<p id="demo"></p>
</html>
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