■浮動小数点問題とは

irb(main):034:0> puts 1.upto(14).map {|i| "#{i} * 1.1 => " + (i * 1.1).to_s  }
1 * 1.1 = 1.1
2 * 1.1 = 2.2
3 * 1.1 = 3.3000000000000003
4 * 1.1 = 4.4
5 * 1.1 = 5.5
6 * 1.1 = 6.6000000000000005
7 * 1.1 = 7.700000000000001
8 * 1.1 = 8.8
9 * 1.1 = 9.9
10 * 1.1 = 11.0
11 * 1.1 = 12.100000000000001
12 * 1.1 = 13.200000000000001
13 * 1.1 = 14.3
14 * 1.1 = 15.400000000000002

どうしてキリのいい結果がたまに紛れるんですか？ 🎳

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