Integer Data Type:  no fractional part

What is the range of the data type int?  (-2^31 to 2^31 -1) (-2147483648 to 2147483647)
 It is 4 bytes. How do you get the range?
 1 byte = 8 bits.  4 bytes = 32 bits.  Leave one bit for + or - sign.

    A. Try the following program when initialize a out of range variable:

  public class Range
  {
     public static void main(String [] args)
     {
         int n = -2147483649;   //-2^31 - 1
         System.out.println(n); 
     }
  } 

  Note: When you compile it, the compiler has informed you the error message as bellowed.

  B. However, for the overflow under a calculation, CPU will not  inform user as bellowed.

  public class Range
  {
     public static void main(String [] args)
     {
         int n = 65536; //2^16
         System.out.println(n * n); //2^32
     }
  }

     Given a wrong result if calculation is overflow.