From: Charlie Lehardy <charlie.lehardy@...>
Date: 2007-08-30T09:02:15+09:00
Subject: Bug in % (Float)?

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Modulo should be a fairly simple operation, however I'm finding some very
odd results and am wondering what is going on... For instance:

irb(main):001:0> 1 % 0.1
=> 0.1

Shouldn't 1 % 0.1 be 0.0 and not 0.1? Also, look at the following example:

irb(main):002:0> a = 1
=> 1
irb(main):003:0> b = 0.1
=> 0.1
irb(main):004:0> a += (a % b) if ((a % b) > 0)
=> 1.1
irb(main):005:0> a += (a % b) if ((a % b) > 0)
=> 1.2
irb(main):006:0> a += (a % b) if ((a % b) > 0)
=> 1.3
irb(main):007:0> a += (a % b) if ((a % b) > 0)
=> 1.4
irb(main):008:0> a += (a % b) if ((a % b) > 0)
=> 1.5
irb(main):009:0> a += (a % b) if ((a % b) > 0)
=> 1.59999999999999

Something is seriously messed up here... Of course, if you do the following:


irb(main):024:0> a = 1
=> 1
irb(main):025:0> b = 0.1
=> 0.1
irb(main):026:0> a += ((a * 100) % (b * 100)) if (((a * 100) % (b * 100)) >
0)
=> nil
irb(main):027:0> a
=> 1

Everything works as expected (at least as *I* expect it to work). So, can
anybody tell me what's going on here? Are things really broken, or am I just
expecting the wrong results?

Thanks,
Charlie

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