emo11"></h3>
<h3 id="mathdemo12"></h3>
<h3 id="mathdemo13"></h3>
<script>
function mathfunction(event) {
event.preventDefault();
let varr = document.getElementById("mathval").value;
document.getElementById("mathdemo1").innerHTML ="round(): " + Math.round(varr);
document.getElementById("mathdemo2").innerHTML = "ceil(): " + Math.ceil(varr);
document.getElementById("mathdemo3").innerHTML = "floor(): " + Math.floor(varr);
document.getElementById("mathdemo4").innerHTML = "trunc(): " + Math.trunc(varr);
document.