# CFLib.org – Common Function Library Project

## PercentageChange(var1, var2)

##### Last updated July 03, 2002

Version: 1 | Requires: CF5 | Library: MathLib

Description:
This function can be used with any 2 numbers you want the percentage change on. Imagine two numbers that pertain to someone's weight. The first number is what they use to weigh and the second is what they currently weigh. You want to know the percentage difference with the + or minus attached to the outcome.

Return Values:
Returns a string.

Example:

``````<cfoutput>
PercentageChange(210,175) = #PercentageChange(210,175)#
</cfoutput>
``````

Parameters:

Name Description Required
var1 The first number. Yes
var2 The second number. Yes

Full UDF Source:

``````/**
* Check the percentage change between 2 numbers.
*
* @param var1      The first number. (Required)
* @param var2      The second number. (Required)
* @return Returns a string.
* @author Guillermo Cruz (gcruz@elkiwa.com)
* @version 1, July 3, 2002
*/
function PercentageChange(var1,var2){
var maxNumber = max(var1,var2);
var minNumber = min(var1,var2);
var change = maxNumber - minNumber;
var symbol = "";

if (var1 EQ var2)   return 0;
change = NumberFormat(change / var1 * 100, 0.00);

if(var1 GT var2) symbol = "-";
else symbol = "+";

return symbol & " " & change;
}
``````

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