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Javascript odd numbers

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Started by kentona, Aug 25 2010 01:25 AM

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5 replies to this topic

#1
kentona
Posted 25 August 2010 - 01:25 AM

kentona

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Hi i'm starting to learn javascript and i'm making a program that will ask the user for a number and then display all odd numbers which are less then or equal to whatever number the user chose. Here is what i have so far,


<!-- odd.html -->

<html>

  <head>

    <title>odd</title>

      <style type="text/css">

        body {

              background-color:#22DD44;

	      color:#DD22EE;

	      font-size:30;

       	      text-align:center;

	     }

      </style>

  </head>

  <body>

    <script type="text/javascript">

      var limit, count, stroutput;

      count = 1;

      stroutput = "";

      document.write("<h1>Odd</h1>");

      limit = prompt("Enter the limit", "");

      if (limit == null)

      {

       stroutput = ("You clicked cancel. No count will be shown.");

      }

      else if (limit == "")

      {

       stroutput = ("Limit must be entered.");

      }

      else if (limit != parseInt(limit))

      {

       stroutput = ("Limit must be a valid whole number");

      }

      else

      {

      while (count <= limit) {

	stroutput = stroutput + count + "\n";

	count = count + 1;

      }

      }

      alert (stroutput);

      document.write("<br /><br />");

      document.write("<br /><br />");

      document.write("<input type='button' name='cmdReload'");

      document.write(" value='Do again' onclick='window.location.reload()' />");

    </script>


  </body>

</html>

As you can see so far it just shows you all numbers but i need it to only show odd numbers. How would i do this?

#2
wim DC
Posted 25 August 2010 - 01:38 AM

wim DC

    Writes binary right handed and hex left handed

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Change
count = count + 1;
into
count = count + 2;

#3
kentona
Posted 25 August 2010 - 01:48 AM

kentona

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Oh dear i feel stupid haha cheers for the help i appreciate it.

#4
kentona
Posted 25 August 2010 - 02:09 AM

kentona

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Oh also sorry for the double post but how do i go about removing the dialogue box in javascript so it displays the numbers on the browser and not this,

Posted Image

#5
PsychoCoder
Posted 25 August 2010 - 08:34 AM

PsychoCoder

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Another options for determining an odd number is to use the modulus operator

while(count <= limit)
{
		if(!(count % 2 == 0))
		{
			stroutput += count + "\r\n";
		}
}

SELECT * FROM Users WHERE Clue > 0;
ERROR: 0 results returned
Posted Image

#6
wim DC
Posted 26 August 2010 - 09:33 AM

wim DC

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kentona said:

Oh also sorry for the double post but how do i go about removing the dialogue box in javascript so it displays the numbers on the browser and not this,
The easiest way to do this is by putting an empty div on the page. (not noticable until something is put in). Give this div a value for the ID attribute
<div id="output"></div>

Then access this div from Javascript and put the string into it:
var element = Document.getElementById('output');
>>create your string with odd numbers here<<
element.innerHTML = strOutput

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