On Sun, 4 Oct 2009 14:52:36 +0200, an_...@hotmail.com (Andrea Giammarchi) wrote:
>
>
>
>> $a = 2260; $b = 226e1; $c = 2.26e3; $d = 2260.0;
>>
>> $a==$b==$c==$d,
>>
>> and
>> $b===$c===$d
>
>$b , $c, and $d are the same indeed ... they represent the floating point
>2260.0 in I think every language ... it's like saying that 1.0 is not 1.0000
>... both floating point numbers, so I don't get your problem ...
IF they are actually floating point numbers. My problem is that I'm working
with values
which are strings, but which sometimes look like either integers or floating
point
numbers. And I apologise for falsely contradicting your previous message; I
realised
subsequently that I had forgotten to specify the variables as strings in my
test. Thus, if
I write:
$a = 2260; $b = '2260'; the exact comparison returns 'false'.
The same applies to all the cases I had been complaining about, and the exact
comparison
does indeed work as you stated. This piece of carelessness arose because my
data is
represented in the simple form, eg:
A;e;21TH;AP;;;;Musical education;090701
but is implicitly converted into strings when it is entered.
(And I tend to be wary of determining the rules experimentally. I learned my
programming
on CDC3200 Fortran fortysomething years ago. Manuals were brief and textbooks
non-existent, so whenever we were not sure of something we would try it.
Unfortunately the
Fortran had some very strange design features, which we learnt about when our
employer
upgraded to a CDC 6600. This used a much more standard Fortran, and many of the
tricks we
had discovered no longer worked.)
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