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 1. Random method of Math class: Raju Rohde

    + p.81-83   -- using Random class, need objects 
      p.203-205 -- using Math class,   no objects

    + Math.random() returns a random floating point number between 
      0.0 (inclusive) and 1.0 (exclusive). Notation: [0,1).

    + SYNTAX: float num1 = Math.random();
    
    + Need to SCALE and SHIFT into an appropriate range

    + Need CASTing (p.73) to produce Integer random numbers

    + SCALE: float rnd = Math.random()*10;        // num1=[0.0,10.0)

    + SHIFT: float rnd = Math.random()+2;         // num1=[2.0,3.0)

    + CAST:  int rnd   = (int) (Math.random()*N); // num1=0,1,...,N-1

    + EXAMPLES:  

      (1) produce a float random number in the range  [1.0,6.0):
          float rnd = Math.random()*5 + 1;

      (2) produce an int random number 0 or 1:
          int rnd = (int) (Math.random()*2);

      (3) produce an int random number 1, 2, 3, or 4:
          int rnd = (int) (Math.random()*4) + 1;

      (4) what is the range of the random number 
          determined with this statement:
          int rnd = (int)  Math.random()*4  + 1;          
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