Converting chars to ints, get a strange math error...

Question

Here's the code I have.
import java.util.*;
public class Encryption {
     public static void main(String[] args) {
          Scanner sc1 = new Scanner(System.in);
          System.out.print("Enter a four-digit integer to be encrypted: ");
          String encrypt = sc1.nextLine();
          char a = encrypt.charAt(0);
          char b = encrypt.charAt(1);
          char c = encrypt.charAt(2);
          char d = encrypt.charAt(3);
          int as = new Integer(a).intValue();
          int bs = new Integer(b).intValue();
          int cs = new Integer(c).intValue();
          int ds = new Integer(d).intValue();
          int codea = (as + 7);
          while (codea > 9) {codea = codea - 10;}
          int codeb = (bs + 7);
          while (codeb > 9) {codeb = codeb - 10;}
          int codec = (cs + 7);
          while (codec > 9) {codec = codec - 10;}
          int coded = (ds + 7);
          while (coded > 9) {coded = coded - 10;}
          int finala = codec;
          int finalb = coded;
          int finalc = codea;
          int finald = codeb;
          String encrypted = ("" + finala + "" + finalb + "" + finalc + "" + finald + "");
          //System.out.println ("The encrypted number is " + encrypted + ""); set aside while debugging
          System.out.println(" " + a + " " + b + " " + c + " " + d + " ");
          System.out.println(" " + as + " " + bs + " " + cs + " " + ds + " ");
}Now here's the console.
Enter a four-digit integer to be encrypted: 1234
1 2 3 4
49 50 51 52
When I went from char to int, 1 became 49, 2 became 50, etc...how did this happen?

Answer 1

class Fubar1
    public static void main(String[] args)
        System.out.println("'1' = " + '1'); // prints the char
        System.out.println("(int)'1' = " + (int)'1'); // prints the ASCII (unicode?) number that represents that char
}