javascript/calculator1.html at master · Ashna-v/javascript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>


</head>
<body>
    <label for="">enter first no</label>
    <input type="number" id="n1" placeholder="first no"><br /><br />
    <label for="">enter second no</label>
    <input type="number" id="n2" placeholder="second no"><br /><br />
    <label for="">result</label>
    <input type="text" id="r"><br /><br />


    <button  onclick="add()">+</button>
    <button  onclick="sub()">-</button>
    <button  onclick="mul()">*</button>
    <button  onclick="div()">/</button>

    <script>
        function add(){
            n1=document.getElementById("n1").value;
            n2=document.getElementById("n2").value;
            r=parseInt(n1)+parseInt(n2)
            document.getElementById("r").value= r


        }

        function sub(){
            n1=document.getElementById("n1").value;
            n2=document.getElementById("n2").value;
            r=parseInt(n1)-parseInt(n2)
            document.getElementById('r').value=r
        }


        function mul(){
            n1=document.getElementById("n1").value;
            n2=document.getElementById("n2").value;
            r=parseInt(n1)*parseInt(n2)
            document.getElementById('r').value=r
        }

        function div(){
            n1=document.getElementById("n1").value;
            n2=document.getElementById("n2").value;
            r=parseInt(n1)/parseInt(n2)
            document.getElementById('r').value=r
        }
    </script>


</body>
</html>