[PHP] Re: Test for whole number.

[Charlie Killian]

That post was incomprehensible. Here it is revised:

I'd like to condense the function below into one line.

function isOneBitSet($n)
{
  $x = log($n)/log(2);
  return ($x == intval($x));
}

AND I don't want to do this:
return (log($n)/log(2) == intval(log($n)/log(2)));

So, is there a way to check if a number is whole only using the number once?
Something like is_whole_number(log($n)/log(2));

Charlie


 Is there a one line test for whole numbers?

 I want to condense this function down to one line:

 function isOneBitSet($n)
 {
 $x = log($n)/log(2);
 return ($x == intval($x));
 }

 TIA,

 Charlie





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Re: [PHP] Re: Test for whole number.

[Tom Rogers]

Hi
Not sure if this is the best way to do it:
function isOneBitSet($n)
{
 return !ereg(\.,strval(log($n)/log(2)));
}


Tom

At 09:16 AM 8/04/2002, Charlie Killian wrote:
That post was incomprehensible. Here it is revised:

I'd like to condense the function below into one line.

function isOneBitSet($n)
{
   $x = log($n)/log(2);
   return ($x == intval($x));
}

AND I don't want to do this:
return (log($n)/log(2) == intval(log($n)/log(2)));

So, is there a way to check if a number is whole only using the number once?
Something like is_whole_number(log($n)/log(2));

Charlie


  Is there a one line test for whole numbers?
 
  I want to condense this function down to one line:
 
  function isOneBitSet($n)
  {
  $x = log($n)/log(2);
  return ($x == intval($x));
  }
 
  TIA,
 
  Charlie
 
 



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Re: [PHP] Re: Test for whole number.

[Miguel Cruz]

On Mon, 8 Apr 2002, Tom Rogers wrote:
 At 09:16 AM 8/04/2002, Charlie Killian wrote:
 I'd like to condense the function below into one line.

 function isOneBitSet($n)
 {
$x = log($n)/log(2);
return ($x == intval($x));
 }

 AND I don't want to do this:
 return (log($n)/log(2) == intval(log($n)/log(2)));

 Not sure if this is the best way to do it:
 function isOneBitSet($n)
 {
  return !ereg(\.,strval(log($n)/log(2)));
 }

Beware; using a regular expression for this is slower than creating an
intermediate variable.

miguel


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