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検索結果
先頭1件
-
bigdecimal (36.0)
-
bigdecimal は浮動小数点数演算ライブラリです。 任意の精度で 10 進表現された浮動小数点数を扱えます。
...点数を扱えます。
//emlist[][ruby]{
require 'bigdecimal'
a = BigDecimal("0.123456789123456789")
b = BigDecimal("123456.78912345678", 40)
print a + b # => 0.123456912580245903456789e6
//}
一般的な 10 進数の計算でも有用です。2 進数の浮動小数点演算には微小な誤......[ruby]{
sum = 0
for i in (1..10000)
sum = sum + 0.0001
end
print sum # => 0.9999999999999062
//}
//emlist[例2: 0.0001 を 10000 回足す場合。(BigDecimal)][ruby]{
require 'bigdecimal'
sum = BigDecimal("0")
for i in (1..10000)
sum = sum + BigDecimal("0.0001")
end
print sum # => 0.1e1
//}......mlist[][ruby]{
require "bigdecimal/math"
//}
とすることで、sin や cos といった関数が使用できるようになります。
使用方法など、詳細は bigdecimal/math を参照して下さい。 その他、Float との相互変換などの
メソッドが bigdecimal/util でサ...