HexaDecimal to Octal in java

Let’s learn how do you convert hexadecimal to octal in java?

Hexadecimal to Octal in java

Let’s see how to convert hexadecimal to octal. Hexadecimal number is base 16 number. It contains 0 to 9 A, B, C, D, E, F where F represents 15. While octal number is base 8 number. It contains 0 to 7.

For example: hexadecimal value – 2E5

binary value of 2 is 0010

binary value of E is 1110

binary value of 5 is 0101

001011100101 group this number in terms of three like this,

001 011 100 101

Octal number is – 1345

Let’s see program on how to convert hexadecimal to octal.

import java.util.Scanner;
public class HexadecimalToOctal
{
   public static void main(String[] args)
   {
      int decimalNumber, a = 1, b;
      int[] octalNumber = new int[100];
      Scanner sc = new Scanner(System.in);
      System.out.print("Please enter a hexadecimal number: ");
      String strHexNumber = sc.nextLine();
      // converting hexadecimal number to decimal number
      decimalNumber = hexToDecimal(strHexNumber);
      // converting decimal to octal
      while(decimalNumber != 0)
      {
         octalNumber[a++] = decimalNumber % 8;
         decimalNumber = decimalNumber / 8;
      }
      System.out.print("Octal number is: ");
      for(b = a - 1; b > 0; b--)
      {
         System.out.print(octalNumber[b]);
      }
      System.out.print("\n");
      sc.close();
   }
   public static int hexToDecimal(String str)
   {
      String strDigits = "0123456789ABCDEF";
      str = str.toUpperCase();
      int value = 0;
      for(int a = 0; a < str.length(); a++)
      {
         char ch = str.charAt(a);
         int deci = strDigits.indexOf(ch);
         value = 16 * value + deci;
      }
      return value;
   }
}

Output:

Please enter a hexadecimal number: 2E5
Octal number is: 1345