HexToOct.java

package com.thealgorithms.conversions;

/**
 * Converts any Hexadecimal Number to Octal
 *
 * @author Tanmay Joshi
 */
public final class HexToOct {
 private HexToOct() {
 }

 /**
 * Converts a Hexadecimal number to a Decimal number.
 *
 * @param hex The Hexadecimal number as a String.
 * @return The Decimal equivalent as an integer.
 */
 public static int hexToDecimal(String hex) {
 String hexDigits = "0123456789ABCDEF";
 hex = hex.toUpperCase();
 int decimalValue = 0;

 for (int i = 0; i < hex.length(); i++) {
 char hexChar = hex.charAt(i);
 int digitValue = hexDigits.indexOf(hexChar);
 decimalValue = 16 * decimalValue + digitValue;
 }

 return decimalValue;
 }

 /**
 * Converts a Decimal number to an Octal number.
 *
 * @param decimal The Decimal number as an integer.
 * @return The Octal equivalent as an integer.
 */
 public static int decimalToOctal(int decimal) {
 int octalValue = 0;
 int placeValue = 1;

 while (decimal > 0) {
 int remainder = decimal % 8;
 octalValue += remainder * placeValue;
 decimal /= 8;
 placeValue *= 10;
 }

 return octalValue;
 }

 /**
 * Converts a Hexadecimal number to an Octal number.
 *
 * @param hex The Hexadecimal number as a String.
 * @return The Octal equivalent as an integer.
 */
 public static int hexToOctal(String hex) {
 int decimalValue = hexToDecimal(hex);
 return decimalToOctal(decimalValue);
 }
}