Highest Common Factor/Lowest Common Multiple

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

<script language="javascript">
function CalcHCF()
{
var groups=1;
var numbers=lcmHCF.nums.value;
for (i=0;i<numbers.length-1;i++)
{if (numbers.charAt(i)==" " & numbers.charAt(i+1)==" "){alert("Only ONE space between numbers, please!");lcmHCF.nums.focus();return false;}
}
if (numbers.charAt(numbers.length-1)==" " || numbers.charAt(0)==" "){alert("Please erase the first and/or last space");lcmHCF.nums.focus();return false;}
for (i=0;i<numbers.length;i++)
{if (numbers.charAt(i)==" ")
{groups++;}
}
if (groups<2){alert ("There should be more than one number");lcmHCF.nums.focus();return false;}

var max=0;
var lcm1=1;
var lcm2=1;
var hcf2=1;
num=new Array(groups);

arr=numbers.split(" ")
for (i=0;i<groups;i++)
{num[i]=eval(arr[i]);
if (num[i]<2){alert ("All numbers should be greater than 1");lcmHCF.nums.focus();return false;}
if (num[i]>max){max=num[i]}
}

for (i=2;i<=max;i++){
tot=0;
for (x=0;x<groups;x++){ 
if (num[x]%i=="0"){tot+=1;}
}
if (tot==groups){hcf2=hcf2*i;max=max/i;
for (a=0;a<groups;a++)
{num[a]=num[a]/i}
i=i-1;
	}
}

for (i=2;i<=max;i++){
tot=0;
for (x=0;x<groups;x++){ 
if (num[x]%i=="0"){tot+=1;num[x]=num[x]/i}
}
if (tot>0){lcm1=lcm1*i;i=i-1}
}

lcm2=lcm2*hcf2*lcm1;

document.getElementById("lcm").innerHTML="Lowest Common Multiple (LCM) = "+lcm2;
if (hcf2=="1"){document.getElementById("hcf").innerHTML="Highest Common Factor (HCF): There are no common factors";}
else
{document.getElementById("hcf").innerHTML="   Highest Common Factor (HCF) = "+hcf2;}
}
</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><td>
<fieldset style="border-color:#000000">
<legend align="center" style="font-size:12pt"><b>Highest Common Factor / Lowest Common Multiple</b></legend>
<div align="center">
<form name=lcmHCF>
<a href="http://www.datedial.com/datLCM_HCF.asp">
Input the numbers - <span style="color:#ff0000">(separate with ONE single space) </span><br>
<input type=text name=nums size=45 onKeyPress="if ((event.keyCode<32) || (event.keyCode>57)) event.returnValue=false"> 
<input type=button value="Get HCF/LCM" onclick="CalcHCF()" style="cursor:hand"><a href="www.datedial.com/datLCM_HCF.asp"></a>
<p>
<div align="left" id=lcm style="background:#999999;color:#ffff00;text-align:center"></div> 
<div align="left" id=hcf style="background:#000000;color:#ffff00;text-align:center"></div>
</form></div>
</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 : Lowest Common Multiple/Highest Common Factor
URL : http://www.datedial.com/datLCM_HCF.asp
DESCRIPTION : Calculates the Lowest Common Multiple (LCM) and the Highest Common Factor (HCF) of a series of numbers.