#181

import java.math.BigDecimal;
import java.math.MathContext;
import java.util.Scanner;

public class Calc {
	static Scanner scanner=new Scanner(System.in);
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int d,a;
		MathContext mc=new MathContext(10);
		d=scanner.nextInt();
		a=scanner.nextInt();
		BigDecimal ra=BigDecimal.valueOf(d*2),rb=BigDecimal.valueOf(a);
		BigDecimal res=ra.divide(rb,mc);
		System.out.println(res.sqrt(mc).toString());
	}

}

Compilation Error:
Main.java:5: error: class Calc is public, should be declared in a file named Calc.java
public class Calc {
       ^
Main.java:15: error: cannot find symbol
		System.out.println(res.sqrt(mc).toString());
		                      ^
  symbol:   method sqrt(MathContext)
  location: variable res of type BigDecimal
2 errors