Python float to int conversion

Question

Basically, I\'m converting a float to an int, but I don\'t always have the expected value.

Here\'s the code I\'m executing:

x = 2.51

print(\"         


        

Answer 1

What Every Computer Scientist Should Know About Floating-Point Arithmetic

Floating-point numbers cannot represent all the numbers. In particular, 2.51 cannot be represented by a floating-point number, and is represented by a number very close to it:

>>> print "%.16f" % 2.51
2.5099999999999998
>>> 2.51*100
250.99999999999997
>>> 4.02*100
401.99999999999994

If you use int, which truncates the numbers, you get:

250
401

Have a look at the Decimal type.