Simple calculator

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 <!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title>Document</title>

</head>

<body>

    Enter a Number 1:<input type="text" id="number1" ><br>

    Enter a Number 2:<input type="text" id="number2" ><br>

    Result:<input type="text" id="result" ><br>

    <input type="button" value="+" onclick="calc('+')">

    <input type="button" value="-" onclick="calc('-')">

    <input type="button" value="/" onclick="calc('/')">

    <input type="button" value="x" onclick="calc('x')">

</body>

<script>

function calc(operator){

    var num1=parseInt(document.getElementById("number1").value);

    var num2=parseInt(document.getElementById("number2").value);

    var result;

    switch(operator){

        case "+":

            result=num1+num2;

            break;

        case "-":

            result=num1-num2;

            break;

        case "/":

            result=num1/num2;

            break;

        case "x":

            result=num1*num2;

            break;

 default:

  result="Invalid Operator";

  break;

    }

    document.getElementById('result').value=result;

}

</script>

</html>

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