WojciechGajewski has asked for the wisdom of the Perl Monks concerning the following question:
Dear all,
I'm so confused. Just wrote this extremely basic program in Perl and it does not work in the way I expected it to work.
Here is the code:
This is crazy!! I had a course on numerical analysis and am aware that if you add very small numbers, some numerical errors can occur. But this? It's like Perl says 2+2 = 3.9999. What the hell?
Please tell me what am I doing wrong. I am guessing it's something with types, confusing strings with numericals...
All the very best,
Wojciech.
What does it return?my $range = 0.1; my $i = 0; while( $i < 1 ) { print $i."\n"; $i = $i + $range; }
Why the "1" at the end? I don't know. But that I can handle. Check out what happens if I want it to loop till $i is lower than 10. The code is now:0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
The result is:my $range = 0.1; my $i = 0; while( $i < 10 ) { print $i."\n"; $i = $i + $range; }
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.99999999999999 6.09999999999999 6.19999999999999 6.29999999999999 6.39999999999999 6.49999999999999 6.59999999999999 6.69999999999999 6.79999999999999 6.89999999999999 6.99999999999999 7.09999999999999 7.19999999999999 7.29999999999999 7.39999999999999 7.49999999999999 7.59999999999999 7.69999999999999 7.79999999999999 7.89999999999999 7.99999999999999 8.09999999999999 8.19999999999999 8.29999999999999 8.39999999999999 8.49999999999999 8.59999999999999 8.69999999999999 8.79999999999998 8.89999999999998 8.99999999999998 9.09999999999998 9.19999999999998 9.29999999999998 9.39999999999998 9.49999999999998 9.59999999999998 9.69999999999998 9.79999999999998 9.89999999999998 9.99999999999998
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Replies are listed 'Best First'. | |
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Re: Simple adding numbers
by davido (Cardinal) on Mar 25, 2013 at 23:53 UTC | |
Re: Simple adding numbers
by toolic (Bishop) on Mar 25, 2013 at 23:54 UTC | |
Re: Simple adding numbers
by AnomalousMonk (Archbishop) on Mar 26, 2013 at 07:42 UTC | |
by Anonymous Monk on Mar 26, 2013 at 07:47 UTC | |
Re: Simple adding numbers
by ig (Vicar) on Mar 26, 2013 at 07:30 UTC | |
Re: Simple adding numbers
by ww (Archbishop) on Mar 26, 2013 at 15:58 UTC | |
Re: Simple adding numbers
by nvivek (Vicar) on Mar 26, 2013 at 05:03 UTC | |
by davido (Cardinal) on Mar 26, 2013 at 05:38 UTC | |
Re: Simple adding numbers
by hdb (Monsignor) on Mar 26, 2013 at 07:37 UTC |
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