Prime Factors Of A Number

1. Copy and paste the following between your HEAD tags:-

<script language="javascript">
function CalcFactor()
{
str=""
var number=numFactor.num.value;
if (number.length<1){alert ("Please input a number");numFactor.num.focus();numFactor.num.select();return false;}
if (number==1){alert ("1 is a prime number");numFactor.num.focus();numFactor.num.select();return false;}
if (number==2){alert ("2 is a prime number");numFactor.num.focus();numFactor.num.select();return false;}
if (number==3){alert ("3 is a prime number");numFactor.num.focus();numFactor.num.select();return false;}
new_num=number
for (i=2;i<=new_num;i++)
{if (new_num%i=="0")
{str=str+i+", ";
new_num=new_num/i;}

while (new_num%i=="0")
{str=str+i+", ";
new_num=new_num/i;}
}

if (str==numFactor.num.value+", ")
{results.innerHTML=numFactor.num.value+" is a prime number!"}
else
{thestring=str.substring(str.length-2,0);
results.innerHTML="The factors of "+numFactor.num.value+" are : "+thestring;}
}
</script>

2. Copy and paste the following code between your BODY tags where you want the input displayed:
<div style="position:absolute; left:?; top:?">
<table width=100% border=0 bordercolor=#ffff00 cellspacing="0" cellpadding="0"><tr align="center"><td>
<fieldset style="border-color:000000">
<legend align="center"><b>Prime Factors Of A Number</b></legend>
<form name=numFactor>
<center>Find factors of 
<input type=text name=num size=12 onKeyPress="if ((event.keyCode<48) || (event.keyCode>57)) event.returnValue=false"> 
<input type=button value="Get Prime Factors" onclick="CalcFactor()"><a href="www.datedial.com/datFactors_Of_Number.asp"></a>
<p style="background:#0000ff;color:#ffffff" id="results" align="center"></p> 
</center>
</form>
</fieldset>
</td></tr></table>
</div>

You can position the display whereever you like. You change the "left" and "top" values in the "div" tag above to whatever values you need. 
a) "top" is the vertical distance of the top left corner of the display starting at zero. The higher the number the lower down the page.
b) "left" is the horizontal distance of the top left corner of the display starting at zero. The higher the number the further across the page.
c) You can change also the color of the display and the background.

If you have any problems or questions please email us at wsmith112@hotmail.com.

LINKING INFORMATION
TITLE : Calculate Prime Factors Of A Number
URL : http://www.datedial.com/datFactors_Of_Number.asp
DESCRIPTION : Calculator that finds the prime factors of a number; or determine if the number is a prime number.