StackOverflow2013

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PO
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Id
10652017
data
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2012-05-18T11:44:10.347
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2012-05-18T14:07:04.240
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2012-05-18T14:07:04.240
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453995
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10637594
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2
Score
2
ViewCount
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LastEditorDisplayName
text
Body
<p>Use <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Math.html#nextAfter%28float,%20double%29" rel="nofollow">nextAfter(double start, double direction)</a>:</p> <pre><code>import java.math.*; public class a { public static void printNeighbours(BigDecimal start) { double result1 = start.doubleValue(); double result2; BigDecimal r1 = new BigDecimal(result1); int com = start.compareTo(r1); if(com != 0) result2 = Math.nextAfter(result1, com * Double.MAX_VALUE); else { result2 = Math.nextAfter(result1, Double.MAX_VALUE); result1 = Math.nextAfter(result1, -Double.MAX_VALUE); r1 = new BigDecimal(result1); } BigDecimal r2 = new BigDecimal(result2); System.out.println("starting:\t"+start); if(com<0) { System.out.println("smaller:\t" + r2); System.out.println("bigger:\t\t"+r1); } else { System.out.println("smaller:\t" + r1); System.out.println("bigger:\t\t"+r2); } System.out.println(); } public static void main(String[] args) { printNeighbours(new BigDecimal("0.25")); printNeighbours(new BigDecimal("0.1")); printNeighbours(new BigDecimal("0.7")); } } </code></pre> <p>Printout:</p> <pre><code>starting: 0.25 smaller: 0.2499999999999999722444243843710864894092082977294921875 bigger: 0.250000000000000055511151231257827021181583404541015625 starting: 0.1 smaller: 0.09999999999999999167332731531132594682276248931884765625 bigger: 0.1000000000000000055511151231257827021181583404541015625 starting: 0.7 smaller: 0.6999999999999999555910790149937383830547332763671875 bigger: 0.70000000000000006661338147750939242541790008544921875 </code></pre>
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1. POCalculating double neighbours of a decimal value
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