import java.util.Scanner;

public class ip {

    public static void main(String[] args) {
        int i = 0;
        Scanner in = new Scanner(System.in);
        System.out.println("Please enter an IPv4 address in dot-decimal notation:");
        String ip = in.nextLine();
        String[] octetArray = ip.split("\\.");
        StringBuilder binaryIP = new StringBuilder();
        if(octetArray.length != 4) {
            System.out.println("Invalid IPv4!");
            return;
        }
        System.out.println("Please enter a mask length:");
        int mask = Integer.parseInt(in.nextLine());
        if(mask < 1 || mask > 31) {
            System.out.println("Invalid mask length!");
            return;
        }
        System.out.println("The IPv4 address in binary notation:");
        for (String string : octetArray) {
            int octet = Integer.parseInt(string);
            if(octet < 0 || octet > 255) {
                System.out.println("Invalid IPv4!");
                break;
            }
            StringBuilder binaryOctet = new StringBuilder(Integer.toBinaryString(octet));
            while (binaryOctet.length() < 8)
                binaryOctet.insert(0, "0");
            binaryIP.append(binaryOctet.toString());
            if(++i < 4) System.out.print(binaryOctet + ".");
            else System.out.print(binaryOctet);
        }
        System.out.print("\n\nAddresses in binary / dot-decimal notation:");
        StringBuilder binaryMask = new StringBuilder();
        StringBuilder binaryNetwork = new StringBuilder();
        StringBuilder binaryBroadcast = new StringBuilder();
        System.out.print("\nMask: ");
        for(i = 0; i < 32; i++) {
            if (i < mask) {
                binaryMask.append(1);
                System.out.print(1);
            } else {
                binaryMask.append(0);
                System.out.print(0);
            }
            if (i % 8 == 7 && i != 31) System.out.print(".");
        }
        System.out.print(" / ");
        for(i = 0; i < 4; i++) {
            System.out.print(Integer.parseInt(binaryMask.substring(i*8, (i+1)*8), 2));
            if(i != 3) System.out.print(".");
        }
        System.out.print("\nNetwork: ");
        for(i = 0; i < 32; i++) {
            if(binaryMask.toString().charAt(i) == '1' && binaryIP.toString().charAt(i) == '1') {
                binaryNetwork.append(1);
                System.out.print(1);
            } else {
                binaryNetwork.append(0);
                System.out.print(0);
            }
            if (i % 8 == 7 && i != 31) System.out.print(".");
        }
        System.out.print(" / ");
        for(i = 0; i < 4; i++) {
            System.out.print(Integer.parseInt(binaryNetwork.substring(i*8, (i+1)*8), 2));
            if(i != 3) System.out.print(".");
        }
        System.out.print("\nBroadcast: ");
        for(i = 0; i < 32; i++) {
            if (i < mask) {
                binaryBroadcast.append(binaryNetwork.toString().charAt(i));
                System.out.print(binaryNetwork.toString().charAt(i));
            } else {
                binaryBroadcast.append(1);
                System.out.print(1);
            }
            if (i % 8 == 7 && i != 31) System.out.print(".");
        }
        System.out.print(" / ");
        for(i = 0; i < 4; i++){
            System.out.print(Integer.parseInt(binaryBroadcast.substring(i*8, (i+1)*8), 2));
            if(i != 3) System.out.print(".");
        }
    }
}