Input text in form to show Value

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Coding

"<h2>JavaScript Statements</h2>
<input type="text" id="aaa">
<input type="text" id="bbb">
<input type="button" value="Click here to run function" onClick="ttt()">
<script>
function ttt(){
    var a=document.getElementById("aaa").value;
    var b=document.getElementById("bbb").value;
    var c=a+b;
    var d=a-b;
    document.getElementById("hhh").innerHTML=d;
}

</script>

<h3 id=”hhh”></h3>”