Maths and rounding £0.83000000000001

otuatail · August 18, 2015

Money in	Money Out	Balance	
				£101.84 
		£10.00 		 £91.84 
		 £1.05 		 £90.79 
		 £1.96 		 £88.83 
		£88.00 		  £0.83000000000001 

<?
// Banking Version 1.0.0   22-07-2015   Desmond O'Toole.
require("../secure/SecureFunctions.php");
include ("secure/SecureFunctionsBank.php");
session_start();
Session_Init();
$page = "Libray Selection";

if(!isset($_SESSION["Pk"]))
{
  header('Location: index.php');
  exit;
}

$Pk = $_SESSION["Pk"];
if(KeyCheckX($Pk)== 0)
{
  header('Location: index.php');
  exit;
}


if(isRoguebot($Browser) == 1)
  exit;

$_SESSION["K9"] =  isRobot($Browser);

if($_SESSION["current_page"] <> $page && $_SESSION['Event_Log'] == "YES")
{
   StoreData($page);
   mailtoX($page,"Desmonds New Site.",""); 
}
$_SESSION["current_page"] = $page;

$filename = filename($_SERVER['PHP_SELF']);
$Update = date("D d-M-Y H:i", filectime($filename));

$qBalance = GetBalance();
$row = mysql_fetch_array($qBalance);
$Date = $row['EntryDate'];
$Value = $row['BalanceValue'];
$stamp =  strtotime($Date);
//$ViewDate = date('D d-M-Y' ,$stamp);
$StartDate = date('D d-M-Y' ,$stamp);

//$QueryDate = date('d-M-Y' ,$stamp);
$qGetAllData = GetAllData($Date);

$curValue = $Value;

?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Pages Home</title>
<META http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<META http-equiv="imagetoolbar" CONTENT="no">
<meta http-equiv="refresh" content="60">
<link rel="stylesheet" href="stylesheets/Library.css" type="text/css">
<link rel="stylesheet" href="stylesheets/LibraryMenu.css" type="text/css">
</head>

<body>

<div id="PageTitle">
	<img src="images/LibraryBanner.jpg" alt="">
</div>

<?
 include('SideMenu.php');
?>

<div id="PageContent">
    <form action="menu.php" method="post">
    <h3>User: <?=greeting()?></h3>
     <h4><? echo MonthlTakings()?></h4>
    <div style="width:720px;padding:0px;float:left;">
        <div style="width:120px;height:10px;padding:10px;float:left;"><b>         Date</b>
        </div>
        <div style="width:70px;height:10px;padding:10px;float:left;"><b>Money In</b>
        </div>
        <div style="width:70px;height:10px;padding:10px;float:left;"><b>Money Out</b>
        </div>
         <div style="width:70px;height:10px;padding:10px;float:left;"><b>Balance</b>
        </div>
       <div style="width:70px;height:10px;padding:10px;float:left;"><b>Reason</b>
        </div>
        <div style="width:190px;height:10px;padding:10px;float:left;"><b>Comment</b>
        </div>

        <div style="width:120px;height:4px;padding:10px;text-align:right;float:left;clear:both"><a href="DataInput.php"><?=$StartDate?></a>
        </div>
        <div style="width:70px;height:4px;padding:10px;text-align:right;float:left;">
        </div>
        <div style="width:70px;height:4px;padding:10px;text-align:right;float:left;">
        </div>
        <div style="width:70px;height:4px;padding:10px;text-align:right;float:left;">£<?=$Value?>
        </div>
        <div style="width:70px;height:4px;padding:10px;float:left;">
        </div>
        <div style="width:190px;height:4px;padding:10px;float:left;">Brought forward
        </div>
		<?
		while($row = mysql_fetch_array($qGetAllData))
		{
			$stamp =  strtotime($row['EntryDate']);
			$ViewDate = date('D d-M-Y' ,$stamp);
			$CurDate = date('D d-M-Y' ,time());

			$input = '£' . $row['Input'];
			if($row['Input'] == '0.00')
				$input = "";

			$out = '£' . $row['Output'];
			if($row['Output'] == '0.00')
				$out = "";
			
			$reason = GetReasonName($row['Reason']);
			$colorSelect = ColourPicker($row['Reason'],$row['EntryDate']);
			
			$curValue = $Value + $row['Input'] - $row['Output'];
			$curValue = RestoreDecimal($curValue);
			$Value = $curValue;
			
			$Comment = $row['Comment'];
			
			//$ID = TransposeKey($row['Tag']);
			$ID = $row['Tag'];
			$x = "";
			//if($CurDate == $ViewDate)
			//   $x = "background-color:#cdcccc;";
			// background-color:#6495ed;
		if($colorSelect == "#777777") {
		?>
        <div style="width:120px;height:4px;padding:10px;text-align:right;float:left;text-color:green;clear:both"><?=$ViewDate?></div>
        <? } else { ?>        
        <div style="width:120px;height:4px;padding:10px;text-align:right;float:left;text-color:green;clear:both"><a href="StatmentEntry.php?ID=<?=$ID?>"><?=$ViewDate?></a></div>
        <? } ?>
        <div style="width:70px;height:4px;padding:10px;color:<?=$colorSelect?>;<?=$x?>text-align:right;float:left;"><?=$input?>
        </div>
        <div style="width:70px;height:4px;padding:10px;color:<?=$colorSelect?>;<?=$x?>text-align:right;float:left;"><?=$out?>
        </div>
        <div style="width:70px;height:4px;padding:10px;color:<?=$colorSelect?>;<?=$x?>text-align:right;float:left;">£<?=$curValue?>
        </div>
        <div style="width:70px;height:4px;padding:10px;color:<?=$colorSelect?>;<?=$x?>float:left;"><?=$reason?>
        </div>
        <div style="width:190px;height:4px;padding:10px;color:<?=$colorSelect?>;<?=$x?>float:left;"><?=$Comment?>
        </div>
		<?
		}
		?>
        <div style="width:70px;height:1px;padding:10px;float:left;clear:both"> </div>
    </div>
    <div style="width:670px;height:50px;padding:0px;float:left;">
    <input class="MyButton"type="submit" name="direction" value="Main Menu">
    <br>
    </div> 
    </form>
</div>
</body>
</html>

Hi I have data from a database table. The table holds simply the date, Money going in, Money going out and a reason fro the transaction. I simply have a rolling balance which is calculated on the fly as the page is created using the data. What I have is this. But all I am doing is adding and subtracting. I could understand it if I divided 1/3

Edited August 18, 2015 by otuatail

requinix · August 18, 2015

Floating-point arithmetic

Round your calculations but only at the very end.

otuatail · August 18, 2015

function RestoreDecimal($curValue) // E2007
{
	$test = explode(".",$curValue);
	if(strlen($test[1]) == 1)
	   $curValue .= "0";
	return $curValue;

Sorry forgot I am using a function to make Shure I have to decimal places because some output was £3.5 not £35.50

Barand · August 18, 2015

what is wrong with number_format ?

otuatail · August 18, 2015

I am not rounding a calculation 5-2 = 3 is not rounding.

Ch0cu3r · August 18, 2015

Umm, number_format is for well formatting numbers not just rounding. Rounding will only occur if are reducing a higher precision number to a lower precision number.

There is no need for your RestorDecimal function, when number format will do that for you.

otuatail · August 18, 2015

Thanks Barand that works but still fail to understand how it RestoreDecimal() caused the problem.

Ch0cu3r · August 18, 2015

Its not your function that was causing it. Its to do with floating point arithmetic, see the link in requinix reply.

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Maths and rounding £0.83000000000001

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