import java.util.Scanner;
public class BigNum {
 private double num;
  public BigNum(double c) {
    num=c;
    System.out.println("BigNum Constructorrun");
  }
  public void setNum(double c) {
    num=c;
  }
  public final double getNum() {
    return num;
  }
  public final void show() {
    System.out.println("BigNum("+num+")");
  }

  public static void main(String[] args) {
    double c1,c2;
    String op;
    System.out.println("请输入c1：");
    Scanner sc=new Scanner(System.in);
    c1=sc.nextDouble();
    BigNum b1=new BigNum(c1);
    BigNum b2=b1;
    b1.show();
    System.out.println("请输入c2：");
    Scanner sc1=new Scanner(System.in);
    c2=sc1.nextDouble();
    b2.setNum(c2);
    b2.show();
    System.out.println("请输入op：");
    Scanner sc2=new Scanner(System.in);
    op=sc2.next();
    if(op.equals("+")) {
      BigNum b3=new BigNum(c1+c2);
      b3.show();
    }
    if(op.equals("-")) {
      BigNum b4=new BigNum(c1-c2);
      b4.show();
    } }
}