javascript-demo/FunctionDemo.html at master · SaiSriRohit143/javascript-demo · GitHub

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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>
    <script>
        //define function
        function sum(num1,num2){
            var total = num1+num2;
            document.write('The adittion of 2 numbers : '+total);
        }
        //function witj return statement
        function getRectArea(width,height){
            if(width>0 && height>0){
                return width*height;
            }
        }
    </script>
</head>
<body>
    <h1 style="color: blue;"> JavaScript Functions Demo </h1>
    <hr>

    <script>
        sum(10,30);
        document.write("<br>");
        sum(20,40);
        document.write("<br>")
        sum(-1,3);
    </script>

    <h1 style="color: blue;"> JavaScript function with return statement </h1>
    <script>
        var area = getRectArea(10,20);
        document.write("<br>The area of REctangle is : "+area);
        document.write("<br>The area of REctangle is : "+getRectArea(15,0));
    </script>
</body>
</html>