js_ck_functs

Please send questions to st10@humboldt.edu .
<html>

<!-- 
     js_ck_functs.html
     Check functions isNumber and isInteger

     by: Sharon Tuttle
     last modified: 8-29-06
-->

<head>
    <title> js_ck_functs: check functions isNumber and isInteger </title>

    <script type="text/javascript">
        <!--
        // returns true if value can be converted to a number using
        //    Number; returns false otherwise
        //
        // Examples: canValueBeNumber("13") == true
        //           canValueBeNumber("george") == false

        function canValueBeNumber (value)
        {
            return !(isNaN( Number(value) ))
        }
 
        // returns true if value can be converted to an integer using
        //    Number; returns false otherwise
        //
        // Examples: canValueBeInteger("13") == true
        //           canValueBeInteger("13.7") == false
        //           canValueBeNumber("george") == false

        function canValueBeInteger (value)
        {
            return canValueBeNumber(value) &&
               (Number(value) == parseInt(value))
        }
        //-->
    </script>  
</head>

<body>

    <h1> CIS 180 Checking-Functions Experiment </h1>

    <h3> js_ck_functs.html </h3>

    <h4> (by Sharon Tuttle, last modified 8-29-06) </h4>

    <hr>

    <script type="text/javascript">
        <!--

        var input = prompt("Please enter something")

        if (canValueBeNumber(input))
        {
            document.write(input + " is a number!<br>")
        }

        if (canValueBeInteger(input))
        {
            document.write(input + " is an integer!<br>")
        }

        if (!canValueBeNumber(input) && !canValueBeInteger(input))
        {
            document.write(input + " is neither integer nor number!<br>")
        }

        //-->
    </script>
    <noscript> 
        <hr> 
        <h3> Your browser does not support JavaScript, or has it disabled; 
             <br> 
             please note that, as a result, this page will not work. </h3> 
        <hr> 
    </noscript> 

    <hr>

</body>
</html>