JSFiddle - React, Tailwind, and code Playground

by Ranganadh Paramkusam

HTML

<input type="text" id="val1" />
<select id="dd">
    <option value="1">+</option>
    <option value="2">-</option>
    <option value="3">*</option>
    <option value="4">/</option>
</select>
<input type="text" id="val2" />
<input type="button" value="calculate" onclick="calculate()" />
<script>
    function calculate(){
    var val1 = document.getElementById("val1").value;
    var val2 = document.getElementById("val2").value;
    var dd_val = parseInt(document.getElementById("dd").value);
    switch(dd_val){
        case 1:
            alert(val1+val2);
            break;
        case 2:
            alert(val1-val2);
            break;
        case 3:
            alert(val1*val2);
            break;
        case 4:
            alert(val1/val2);
            break;
        default:
            alert("Error");
    }
}

</script>