"""
Ex. 2.21 from "A primer on..."
Demonstrate why we should always use a 
tolerance when comparing floats.
"""

a = 1 / 947.0 * 947
b = 1
if a != b:
    print('Wrong result!')


tol = 1e-14
if abs(a - b) < tol:
    print('Correct result')


"""
Terminal> python compare_floats.py 
Wrong result!
Correct result
"""