JavaLearning/tutorial/ValidateHKID.java

package tutorial;

import java.util.Scanner;

public class ValidateHKID {
	public static void main(String[] args) {

	Scanner input = new Scanner(System.in);
	System.out.println("Please enter your first 7 character of your HKID card number.");
	String str = input.nextLine();

	char[] strHKID;
	int sum;
	int code;
	strHKID = str.toCharArray();
	strHKID[0] = Character.toUpperCase(strHKID[0]);
	sum = ( (int)strHKID[0] -64 ) *8;
	sum = sum + ( (int)strHKID[1] -48 ) *7;
	sum = sum + ( (int)strHKID[2] -48 ) *6;
	sum = sum + ( (int)strHKID[3] -48 ) *5;
	sum = sum + ( (int)strHKID[4] -48 ) *4;
	sum = sum + ( (int)strHKID[5] -48 ) *3;
	sum = sum + ( (int)strHKID[6] -48 ) *2;
	code = 11 - ( sum % 11);

	System.out.print("The HKID is: " + strHKID[0] + str.substring(1,7));
	if (code == 11) {
			System.out.println("(0)");
	} else if(code == 10) {
		System.out.println("(A)");
	} else {
		System.out.println( "(" + code + ")" );
		}

	}
}