The Modulus Operator

 
public class Main {
  public static void main(String args[]) {
    int x = 42;

    System.out.println("x mod 10 = " + x % 10);
  }
}

 
public class Main {
  public static void main(String args[]) {
    double y = 42.25;

    System.out.println("y mod 10 = " + y % 10);
  }
}

  public class Main {
  public static void main(String[] args) {
    int limit = 100;
    System.out.println("Prime numbers between 1 and " + limit);
    for (int i = 1; i < 100; i++) {
      boolean isPrime = true;
      for (int j = 2; j < i; j++) {
        if (i % j == 0) {
          isPrime = false;
          break;
        }
      }
      if (isPrime)
        System.out.print(i + " ");
    }
  }
}