JavaAlgorithms/DataStructures/Stacks/DecimalToAnyUsingStack.java

package DataStructures.Stacks;

import java.util.Stack;

public class DecimalToAnyUsingStack {
  public static void main(String[] args) {
    assert convert(0, 2).equals("0");
    assert convert(30, 2).equals("11110");
    assert convert(30, 8).equals("36");
    assert convert(30, 10).equals("30");
    assert convert(30, 16).equals("1E");
  }

  /**
   * Convert decimal number to another radix
   *
   * @param number the number to be converted
   * @param radix the radix
   * @return another radix
   * @throws ArithmeticException if <tt>number</tt> or <tt>radius</tt> is invalid
   */
  private static String convert(int number, int radix) {
    if (radix < 2 || radix > 16) {
      throw new ArithmeticException(
          String.format("Invalid input -> number:%d,radius:%d", number, radix));
    }
    char[] tables = {
      '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
    };
    Stack<Character> bits = new Stack<>();
    do {
      bits.push(tables[number % radix]);
      number = number / radix;
    } while (number != 0);

    StringBuilder result = new StringBuilder();
    while (!bits.isEmpty()) {
      result.append(bits.pop());
    }
    return result.toString();
  }
}