回答編集履歴
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追記
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@@ -1,6 +1,8 @@
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つ [浮動小数点数(float, double)演算の丸め誤差と対策](http://tech-blog.tsukaby.com/archives/740)
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[追記]
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なぜという質問の答えではないですが＾＾；
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```java
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@@ -21,8 +23,6 @@
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/**
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*
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-
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* @author kondo
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*/
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1
追記
test
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@@ -1 +1,67 @@
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つ [浮動小数点数(float, double)演算の丸め誤差と対策](http://tech-blog.tsukaby.com/archives/740)
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[追記]
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```java
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package javaapplication1;
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10
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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/**
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*
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* @author kondo
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*/
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public class JavaApplication1 {
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/**
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* @param args the command line arguments
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*/
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public static void main(String[] args) {
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// TODO code application logic here
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double d = 10/3.0;
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System.out.println( d + " = " + Long.toBinaryString(Double.doubleToRawLongBits(d)));
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//
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BigDecimal b1 = new BigDecimal("10.0");
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BigDecimal b2 = new BigDecimal("3.0");
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BigDecimal a = b1.divide(b2,20,RoundingMode.HALF_UP);
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System.out.println( a );
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}
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}
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```
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結果：
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64
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65
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3.3333333333333335 = 100000000001010101010101010101010101010101010101010101010101011
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3.33333333333333333333
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