// random numbers
// Originally by Raju Rohde from Spring 2000
// Spring 2001: cleaned up by DIS Spring 2001
// Fall 2001: added generalization, some other wording clarification

public class random {
    public static void main(String[] args) {
	
	/****************************************************************
	 * Math.random() returns a random floating-point number between *
	 * 0.0 (inclusive) and 1.0 (exclusive).                         *
	 ****************************************************************
	 * SYNTAX:   double r = Math.random();                          *
	 * NOTATION: r is a value in [0,1) or 0<=r<1                    *
	 ****************************************************************
	 * Need to SCALE and SHIFT into an appropriate range            *
	 * Need CASTing to produce Integer random numbers               *
	 *   scaling:                                                   *
	 *      Math.random()*N;         // [0.0,N)                     *
	 *   shifting:                                                  *
	 *      Math.random()+N;         // [N,N+1)                     *
	 *   casting:                                                   *
	 *      (int) (Math.random()*N); // [0,N-1)                     *
	 ****************************************************************/
	
	/****************************************************************
	 * EXAMPLES:	                                                *
	 ****************************************************************/
	
	// Produce a double random number in the range  [1.0,6.0):
	   double rnd1 = Math.random()*5 + 1;
	
        // Produce an integer random number 0 or 1:
           int rnd2 = (int) (Math.random()*2);

        // Produce an integer random number 1, 2, 3, or 4:
           int rnd3 = (int) (Math.random()*4) + 1;

	/****************************************************************
	 * Generalization:                                              *
	 ****************************************************************/

	// Produce a random interger between LOW and HIGH, inclusive:
	   final int LOW = -3;
	   final int HIGH = 2;
	   int genRand = (int) (Math.random()*(HIGH-LOW+1)) + (int) LOW;
           System.out.println(genRand);
    }

}