Is it new math???

[admoore]

I have code that looks like this:

    $trade_avail = $trade_total - $trade_total_redeemed ;
    $trade_avail = number_format($trade_avail,2);

with $trade_total's value of 1000 and $trade_total_redeemed's value of 100, I get a result of -99

That's 1000 - 100 = -99?!

I have been through the code numerous times and can't figgure out what the heck is going on.

TIA,

-A

 

[sleipnir214]

If $trade_total contained a string that began with a numeric 1 and was followed by letters, when PHP converted it to an integer to use in the formula, it would convert the "1xxx" to the number 1. That would explain your result.


Are you sure that the value of $trade_total is 1000 and not "1OOO" (the string comprised of the digit one followed by three letters "O")?





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[kpetursson]

are the values of $trade_total & $trade_total_redeemed 1000 and 100 respectivly or 1000.0 and/or 100.0? in other words are you doing integer math of floating point math?

Kevin Petursson
--
"Everyone says quotable things everyday, but their not famous... so nobody cares."... Some Person