import java.util.Scanner;

class Arithmetic{

protected float a;

protected float b;

Arithmetic(float a, float b){

this.a=a;

this.b=b;

}

float calc(){return 0;}

public static void main(String[] ar){

System.out.print("\nEnter first number: ");

float a=( new Scanner(System.in)).nextFloat();

System.out.print("\nEnter second number: ");

float b=( new Scanner(System.in)).nextFloat();

System.out.println(String.format("%1.1f+%1.1f=%2.2f",a,b,(new Add(a,b)).calc()));

System.out.println(String.format("%1.1f/%1.1f=%2.2f",a,b,(new Div(a,b)).calc()));

System.out.println(String.format("%1.1f*%1.1f=%2.2f",a,b,(new Mul(a,b)).calc()));

System.out.println(String.format("%1.1f-%1.1f=%2.2f",a,b,(new Sub(a,b)).calc()));

System.out.println(String.format("%1.1f(abstract)%1.1f=%2.2f",a,b,(new Arithmetic(9,8)).calc()));

}

}