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// import com.sun.corba.se.impl.resolver.SplitLocalResolverImpl;
// 必要时二分求超高精度的浮点数
import javafx.util.Pair;

import java.util.*;
import java.math.BigInteger;
import java.util.Scanner;
import java.math.BigDecimal;

public class Main {

    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
      //  while (cin.hasNext()) {
            /*
            BigDecimal(int)：将int表示形式转换为BigDecimal对象
            BigDecimal(String) ：将字符串表示形式转换为BigDecimal对象
            BigDecimal(double)：将double表示形式转换为BigDecimal对象

            int a = bigdemical.compareTo(bigdemical2)
            a = -1,表示bigdemical小于bigdemical2；
            a = 0,表示bigdemical等于bigdemical2；
            a = 1,表示bigdemical大于bigdemical2；
            * */
            BigDecimal a = new BigDecimal("10");
            BigDecimal b = new BigDecimal("5");
            BigDecimal c = new BigDecimal(-1);
            System.out.println(a.add(b));
            System.out.println(a.subtract(b));
            System.out.println(a.multiply(b));
            System.out.println(a.divide(b));
            System.out.println(a.compareTo(b));
            System.out.println(c.abs());
            System.out.println(c.toString());
        String s = "0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001";
		BigDecimal eps = new BigDecimal(s);
        BigDecimal F = BigDecimal.valueOf(5);
		BigDecimal l = BigDecimal.valueOf(2), r = BigDecimal.valueOf(3), mid;
		while(l.multiply(l).subtract(F).abs().compareTo(eps) > 0){
			mid = l.add(r).divide(BigDecimal.valueOf(2));
			if(mid.multiply(mid).compareTo(F) < 0) l = mid;
			else r = mid;
		}
		BigDecimal key = l.add(BigDecimal.ONE).divide(BigDecimal.valueOf(2.0));
      //  }
    }
}