public class ModAndInce
  /** This class demonstrates % and ++ in Java and +=
    * */
{
  public static void main(String[] args)
  {   
    // Introducing the MODULUS operator defined on integers
    int rem=7%3; // answer is 1. 7/3 is 2 R 1 and the remainder is answer to modulus
    System.out.println("7%3=" + rem);
    rem=21%12; // answer is 9
    System.out.println("21%12=" + rem);
    // rem=21.5%6; // modulus is not defined on doubles (compiler error)
    // We often use modulus to check for divisiblity. A remainder of zero
    // means that the number is divisible 
    int x;
    x=x+1;
    x+=1;  // for adding a value to a variable
    x+=5; // to add 5 to x
    x++;   // increment operator NOT the same as x+1,it is the same as x=x+1
    ++x; 
  }
}