Hex To Decimal - Java Algorithm

Java examples for Algorithm:Number

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Description

Hex To Decimal

Demo Code


import java.util.Scanner;

public class Main {


  public static void main(String[] args) {
    String hex = "A";
    int number = Calculate(hex);
    String binary = CalculateToBinary(number);

    System.out.println(hex);//from w w  w.  jav a  2  s. c  om
    System.out.println(number);
    System.out.println(binary);

  }

  public static int Calculate(String hex) {
    int number = 0;
    int power = 1;
    for (int i = hex.length() - 1; i >= 0; i--) {
      int num;

      switch (hex.charAt(i)) {
      case 'A':
        num = 10;
        break;
      case 'B':
        num = 11;
        break;
      case 'C':
        num = 12;
        break;
      case 'D':
        num = 13;
        break;
      case 'E':
        num = 14;
        break;
      case 'F':
        num = 15;
        break;
      default:
        num = (int) hex.charAt(i) - 48;
        break;
      }
      number = number + (num * power);
      power = power * 16;

    }
    return number;
  }

  public static String CalculateToBinary(int number) {
    String bin = "";
    int bit = 0;

    while (number > 0) {
      bit = number % 2;
      number = number / 2;
      bin = bit + bin;
    }
    return bin;

  }

}

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