The value x = 1.11022e-16 is so small that x + 1 = 1.
but for   x = 2.22045e-16  this is not true.
The value y = 0 is so small that y/2 = y 
but for   y = 4.94066e-324  this is not true.
The value z = Inf is so big that z * 2 = z.
but for   z = 8.98847e+307  this is not true.