/* Using single Inheritance */
import java.io.*;
import java.util.Scanner;

class todecimal {

	/* Global variables */
	int decimal;

	todecimal(int binary) {
		int reminder, i = 1;
		while(binary != 0) {
			reminder = binary % 10;
			decimal += reminder * i;
			i *= 2;
			binary /= 10;
		}
		System.out.println("Decimal: "+decimal);
	}
}

/* Inherit parent class into child class using 'extends' keyword */
class tohex extends todecimal {
	int i = 1, value;
	String hex = "";
	tohex(int binary) {
		super(binary);
		while(decimal != 0) {
			value = decimal % 16;
			switch(value) {
				case 10:
					hex = hex + 'A';
					break;
				case 11:
					hex = hex + 'B';
					break;
				case 12:
					hex = hex + 'C';
					break;
				case 13:
					hex = hex + 'D';
					break;
				case 14:
					hex = hex + 'E';
					break;
				case 15:
					hex = hex + 'F';
					break;
				default:
					hex = value + hex;
					break;
			}
			decimal /= 16;
		}
		System.out.println("Hex: "+hex);
	}
}

class converter {
	public static void main(String args[ ]) {
		Scanner input = new Scanner(System.in);
		System.out.println("Please enter a Binary Number");
		tohex hex = new tohex(Integer.parseInt(input.nextLine()));
	}
}


          /****** Output ******/
          
Please enter a Binary Number

1111

Decimal: 15

Hex: F