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[ruby/bigdecimal] Add BigDecimal#scale

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Fixes GH-198.

4fbec55680
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Kenta Murata 2021-11-25 14:51:13 +09:00
parent 0c63aa11bc
commit aca96f7ec7
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2 changed files with 206 additions and 70 deletions
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53
test/bigdecimal/test_bigdecimal.rb
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@ -2070,6 +2070,59 @@ class TestBigDecimal < Test::Unit::TestCase
end
end
def test_scale_only_integer
assert_equal(0, BigDecimal(0).scale)
assert_equal(0, BigDecimal(1).scale)
assert_equal(0, BigDecimal(-1).scale)
assert_equal(0, BigDecimal(10).scale)
assert_equal(0, BigDecimal(-10).scale)
assert_equal(0, BigDecimal(100_000_000).scale)
assert_equal(0, BigDecimal(-100_000_000).scale)
assert_equal(0, BigDecimal(100_000_000_000).scale)
assert_equal(0, BigDecimal(-100_000_000_000).scale)
assert_equal(0, BigDecimal(100_000_000_000_000_000_000).scale)
assert_equal(0, BigDecimal(-100_000_000_000_000_000_000).scale)
assert_equal(0, BigDecimal("111e100").scale)
assert_equal(0, BigDecimal("-111e100").scale)
end
def test_scale_only_fraction
assert_equal(1, BigDecimal("0.1").scale)
assert_equal(1, BigDecimal("-0.1").scale)
assert_equal(2, BigDecimal("0.01").scale)
assert_equal(2, BigDecimal("-0.01").scale)
assert_equal(2, BigDecimal("0.11").scale)
assert_equal(2, BigDecimal("-0.11").scale)
assert_equal(21, BigDecimal("0.000_000_000_000_000_000_001").scale)
assert_equal(21, BigDecimal("-0.000_000_000_000_000_000_001").scale)
assert_equal(100, BigDecimal("111e-100").scale)
assert_equal(100, BigDecimal("-111e-100").scale)
end
def test_scale_full
assert_equal(1, BigDecimal("0.1").scale)
assert_equal(1, BigDecimal("-0.1").scale)
assert_equal(2, BigDecimal("0.01").scale)
assert_equal(2, BigDecimal("-0.01").scale)
assert_equal(2, BigDecimal("0.11").scale)
assert_equal(2, BigDecimal("-0.11").scale)
assert_equal(2, BigDecimal("11111e-2").scale)
assert_equal(2, BigDecimal("-11111e-2").scale)
assert_equal(18, BigDecimal("100.000_000_000_000_000_001").scale)
assert_equal(18, BigDecimal("-100.000_000_000_000_000_001").scale)
end
def test_scale_special
BigDecimal.save_exception_mode do
BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false)
BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false)
assert_equal(0, BigDecimal("Infinity").scale)
assert_equal(0, BigDecimal("-Infinity").scale)
assert_equal(0, BigDecimal("NaN").scale)
end
end
def test_n_significant_digits_only_integer
assert_equal(0, BigDecimal(0).n_significant_digits)
assert_equal(1, BigDecimal(1).n_significant_digits)