#exercise 2.21 from A primer...

a = (1/947.0)*947
b=1

#Checking for equality does not work:
if a != b:
    print('Wrong result! The numbers should be equal...')
"""
Here we check if the numbers are equal to a tolerance.
We invert the test to make the output more meaningful.
"""
tol = 1e-10
if abs(a-b) < tol:
    print('Now it is correct. The numbers are equal.')

"""
Terminal> python compare_floats.py
Wrong result! The numbers should be equal...
Now it is correct. The numbers are equal.
"""