Division by Zero help

[LastFather]

Hello,

 

On my Stats page on my MMOG text based mafia game, i get a Division by zero error on the My Stats page. I can't work out what it is. Here is the bit of code it relates to (The bottom line - percentage)

 

$currank=$fetch->rank;

 

$rankp = $fetch->rankpoints;

 

 

 

if ($currank == "Empty-suit"){

 

$max = "100";

 

$old="0";

 

}elseif ($currank == "Delivery Boy"){

 

$max = '300';

 

$old="100";

 

}elseif ($currank == "Picciotto"){

 

$max = '800';

 

$old="300";

 

}elseif ($currank == "Shoplifter"){

 

$max = '1500';

 

$old="800";

 

}elseif ($currank == "Pickpocket"){

 

$max = '3500';

 

$old="1500";

 

}elseif ($currank == "Thief"){

 

$max = '6000';

 

$old="3500";

 

}elseif ($currank == "Associate"){

 

$max = '8000';

 

$old="6000";

 

}elseif ($currank == "Mobster"){

 

$max = '12000';

 

$old="8000";

 

}

elseif ($currank == "Soldier"){

 

$max = '15000';

 

$old="12000";

 

}

elseif ($currank == "Swindler"){

 

$max = '18000';

 

$old="15000";

 

}

elseif ($currank == "Assassin"){

 

$max = '22000';

 

$old="18000";

 

}

elseif ($currank == "Local Chief"){

 

$max = '28000';

 

$old="22000";

 

}

elseif ($currank == "Chief"){

 

$max = '34000';

 

$old="28000";

 

}

elseif ($currank == "Bruglione"){

 

$max = '40000';

 

$old="34000";

 

}

elseif ($currank == "Godfather"){

 

$max = '200000';

}

$percent = round((($rankp-$old)/($max-$old))*100, 2);

?>

[ejaboneta]

I've found that a good way to troubleshoot such a problem is by printing the script you are trying to run.

 

what I mean is using this line

<?php
$percent = round((($rankp-$old)/($max-$old))*100, 2);
?>

 

and printing what its actually doing

<?php
echo "$percent = round((($rankp-$old)/($max-$old))*100, 2);";
?> 

[Mchl]

Since there's only one division in entire script, it shouldn't be all that difficilt to fnd out why $max-$old happens to be equal to 0 (probably $currank is not equal to any of the possible choices).

 

BTW: For assignments like this use switch

[LastFather]

I've found that a good way to troubleshoot such a problem is by printing the script you are trying to run.

 

what I mean is using this line

<?php
$percent = round((($rankp-$old)/($max-$old))*100, 2);
?>

 

and printing what its actually doing

<?php
echo "$percent = round((($rankp-$old)/($max-$old))*100, 2);";
?> 

 

I got this - = round(((10213-)/(-))*100, 2);

[ejaboneta]

$currank=$fetch->rank;
$rankp = $fetch->rankpoints;[/code]

 

These probably aren't returning any values.