Math.random() functions

class RandomNumbers {
  public static void main(String[] args) {
    // Random double value between 0 and 1
    System.out.println(Math.random());

    // Random double value between 0 and 9
    double a = Math.random() * 10;  // by default is of double type
    System.out.println(a);

    // Random int value between 0 and 9
    int b = (int)(Math.random() * 10); // to explicitly change to int type
    System.out.println(b);

    // Random int value between 1 and 10
    int c = (int)(Math.random() * 10) + 1;  // place +1 outside the parentheses
    System.out.println(c);                  // if place inside parentheses, we would get a random int between 0 and 10

    // Random int value between 10 and 20
    // (Math.random() * (maxValue - minValue + 1)) + minValue.
    int d = (int)(Math.random() * 11 ) + 10; // +10 meaning to start at 10
    System.out.println(d);
  }
}