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Bug #15756 bad Subtraction
Submitted: 2002-02-27 04:47 UTC Modified: 2002-02-27 05:00 UTC
From: jjulio at post dot sk Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 4.0.6 OS: linux
Private report: No CVE-ID: None
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 [2002-02-27 04:47 UTC] jjulio at post dot sk 
When i use this code:
<?
  echo 120-119.1."\n";
  echo 120-119.2."\n";
  echo 120-119.3."\n";
  echo 120-119.4."\n";
  echo 120-119.5."\n";
  echo 120-119.6."\n";
  echo 120-119.7."\n";
  echo 120-119.8."\n";
  echo 120-119.9."\n";
?>
or with variables...results was:

0.90000000000001
0.8
0.7
0.59999999999999
0.5
0.40000000000001
0.3
0.2
0.099999999999994

Is it correct or no?

How can i get correct results without using round()???

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 [2002-02-27 04:52 UTC] rasmus@php.net 
Please don't ask support questions in the bug database.
Computers can only approximate floating point numbers to a certain level of precision.  Simply set the precision you want.  Try adding this line before your echo lines:
ini_set('precision',4);
 [2002-02-27 05:00 UTC] jjulio at post dot sk 
ok, sorry
 
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