[Tutor] Loop comparison
davea at ieee.org
Sat Apr 17 10:47:55 CEST 2010
Alan Gauld wrote:
> "Lie Ryan" <lie.1296 at gmail.com> wrote
>>> A friend of mine suggested me to do the next experiment in python
>>> and Java.
>>> It's a simple program to sum all the numbers from 0 to 1000000000.
>>> result = i = 0
>>> while i < 1000000000:
>>> result += i
>>> i += 1
>>> print result
>> Are you sure you're not causing Java to overflow here? In Java,
>> Arithmetic Overflow do not cause an Exception, your int will simply wrap
>> to the negative side.
> Thats why I asked if he got a float number back.
> I never thought of it just wrapping, I assumed it would convert to
> Now that would be truly amusing.
> If Java gives you the wrong answer much faster than Python gives the
> right one, which is best in that scenario?! :-)
> Alan G.
It's been years, but I believe Java ints are 64 bits, on a 32bit
implementation. Just like Java strings are all unicode.
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