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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.math.*;
  6. import java.io.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		double n = 1234567.8912;
  14.  
  15. 		System.out.println(getRounded(n, 10));
  16.  
  17. 		n = 12.345678915;
  18. 		System.out.println(getRounded(n, 10));
  19.  
  20. 		n = 0.012347874587456145;
  21. 		System.out.println(getRounded(n, 10));
  22.  
  23. 		n = 5;
  24. 		System.out.println(getRounded(n, 10));
  25. 	}
  26.  
  27. 	private static BigDecimal getRounded(double n, int totalDigits) {
  28.  
  29. 		String nString = Double.toString(n);
  30. 		if(nString.contains(".")) {
  31. 			int dotPos = nString.indexOf("."); // = number of digits before the decimal point
  32.  
  33. 			int remainingDigits = totalDigits - dotPos; // = remaining digits after the decimal point
  34.  
  35. 			return new BigDecimal(nString).setScale(remainingDigits, BigDecimal.ROUND_HALF_UP); // round
  36. 		}
  37.  
  38. 		return new BigDecimal(n);
  39. 	}
  40. }
Success #stdin #stdout 0.05s 711168KB
comments (?)
stdin 
Standard input is empty
stdout 
1234567.891
12.34567892
0.012347875
5.000000000
https://ideone.com/my7eB2
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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