JavaAlgorithms/Conversions/HexaDecimalToDecimal.java

package Conversions;

import java.util.Scanner;

public class HexaDecimalToDecimal {

  // convert hexadecimal to decimal
  public static int getHexaToDec(String hex) {
    String digits = "0123456789ABCDEF";
    hex = hex.toUpperCase();
    int val = 0;
    for (int i = 0; i < hex.length(); i++) {
      int d = digits.indexOf(hex.charAt(i));
      val = 16 * val + d;
    }
    return val;
  }

  // Main method gets the hexadecimal input from user and converts it into Decimal output.

  public static void main(String args[]) {
    String hexa_Input;
    int dec_output;
    Scanner scan = new Scanner(System.in);

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

    // convert hexadecimal to decimal

    dec_output = getHexaToDec(hexa_Input);
    /*
    Pass the string to the getHexaToDec function
    and it returns the decimal form in the variable dec_output.
    */
    System.out.println("Number in Decimal: " + dec_output);
    scan.close();
  }
}