package Conversions;

import java.util.Scanner;

/**
 * Converts any Hexadecimal Number to Octal
 *
 * @author Tanmay Joshi
 */
public class HexToOct {
 /**
 * This method converts a Hexadecimal number to a decimal number
 *
 * @param s The Hexadecimal Number
 * @return The Decimal number
 */
 public static int hex2decimal(String s) {
 String str = "0123456789ABCDEF";
 s = s.toUpperCase();
 int val = 0;
 for (int i = 0; i < s.length(); i++) {
 char a = s.charAt(i);
 int n = str.indexOf(a);
 val = 16 * val + n;
 }
 return val;
 }

 /**
 * This method converts a Decimal number to a octal number
 *
 * @param q The Decimal Number
 * @return The Octal number
 */
 public static int decimal2octal(int q) {
 int now;
 int i = 1;
 int octnum = 0;
 while (q > 0) {
 now = q % 8;
 octnum = (now * (int) (Math.pow(10, i))) + octnum;
 q /= 8;
 i++;
 }
 octnum /= 10;
 return octnum;
 }

 /**
 * Main method that gets the hex input from user and converts it into octal.
 * @param args arguments
 */
 public static void main(String args[]) {
 String hexadecnum;
 int decnum, octalnum;
 Scanner scan = new Scanner(System.in);

 System.out.print("Enter Hexadecimal Number : ");
 hexadecnum = scan.nextLine();

 // first convert hexadecimal to decimal
 decnum = hex2decimal(hexadecnum); //Pass the string to the hex2decimal function and get the decimal form in variable decnum

 // convert decimal to octal
 octalnum = decimal2octal(decnum);
 System.out.println("Number in octal: " + octalnum);
 scan.close();
 }
}