Area of a rectangle

        
<!DOCTYPE html>
<html>
    <head>
        <title>area of rectangle</title>
    </head>
    <body>
        <h3>Area of a rectangle</h3>
        <form name="f1">
            Enter the length:- <input type="number" name="n1" required><br>
            Enter the width:- <input type="number" name="n2" required><br>
            Area of rectangle:- <input type="number" name="n3" readonly><br>
            <input type="submit" value="calculate" onclick="area()">
        </form>
        <script language="javascript">
            function area()
            {
                event.preventDefault();
                var l,w,a;
                l = f1.n1.value;
                w = f1.n2.value;
                a = l*w;
                f1.n3.value = ""+a;

            }        
        </script>
    </body>
</html>
Area of a rectangle

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