I have a 100 digit number and I am trying to put all the digits of the number into a list, so that I can perform operations on them. To do this, I am using the following code:
for x in range (0, 1000):
list[x] = number % 10
number = number / 10
But the problem I am facing is that I am getting an overflow error something like too large number float/integer. I even tried using following alternative
number = int (number / 10)
How can I divide this huge number with the result back in integer type, that is no floats?
Python supports a "bignum" integer type which can work with arbitrarily large numbers. In Python 2.5+, this type is called long and is separate from the int type, but the interpreter will automatically use whichever is more appropriate.
In Python, there are two types of division operators: / : Divides the number on its left by the number on its right and returns a floating point value. // : Divides the number on its left by the number on its right, rounds down the answer, and returns a whole number.
Floor Division and True Division In Python 3. x, slash operator ("/") does true division for all types including integers, and therefore, e.g. 3/2==1.5. The result is of a floating-point type even if both inputs are integers: 4 / 2 yields 2.0.
The Python "OverflowError: integer division result too large for a float" occurs when the result of a division is too large. Use the floor division // operator to solve the error, e.g. result = large_num // 5 .
In Python 3, number / 10
will try to return a float
. However, floating point values can't be of arbitrarily large size in Python and if number
is large an OverflowError
will be raised.
You can find the maximum that Python floating point values can take on your system using the sys
module:
>>> import sys
>>> sys.float_info.max
1.7976931348623157e+308
To get around this limitation, instead use //
to get an integer back from the division of the two integers:
number // 10
This will return the int
floor value of number / 10
(it does not produce a float). Unlike floats, int
values can be as large as you need them to be in Python 3 (within memory limits).
You can now divide the large numbers. For instance, in Python 3:
>>> 2**3000 / 10
OverflowError: integer division result too large for a float
>>> 2**3000 // 10
123023192216111717693155881327...
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