/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.BigDecimal;
import java.math.RoundingMode;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(round(18.4 - 10.5, 6));
		System.out.println(round(18.43456585675467876, 6));
	}
 
	public static double round(double value, int places) {
    	if (places < 0) throw new IllegalArgumentException();
 
    	BigDecimal bd = new BigDecimal(value);
		bd = bd.setScale(places, RoundingMode.HALF_UP);
    	return bd.doubleValue();
}
}

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