#Exercise 2.20 from A primer...

eps = 1.0
while 1.0 != 1.0 + eps:
    print('...............', eps)
    eps = eps/2.0
print('final eps:', eps)

"""
Terminal> python machine_zero.py
............... 1.0
............... 0.5
............... 0.25
............... 0.125
...
............... 4.440892098500626e-16
............... 2.220446049250313e-16
final eps: 1.1102230246251565e-16
"""