Project euler no. 3

[Someone Something]

But, I'm returning true or false right?

On Sat, Sep 12, 2009 at 11:32 AM, MRAB <python at mrabarnett.plus.com> wrote:

> Someone Something wrote:
>
>> Project euler (in case you don't know: projecteuler.net <
>> http://projecteuler.net>)
>>
>> I'm trying to do the third one and here's my current code:
>>
>>  1 def checkPrime (x):
>>  2     factors=2;
>>  3     while factors<=x:
>>  4         if x==factors:
>>  5             return True;
>>  6         elif x%factors==0:
>>  7             return False;
>>  8         elif x%factors!=0:
>>  9             factors=factors+1;
>>
>
> You're not returning 'factors', so the function will return None.
>
>
>   10
>>  11 factorl=[];
>>  12 factors=600851475142;
>>  13
>>  14 while factors != 1:
>>  15     if 600851475143%factors==0:
>>  16         if checkPrime(factors)==True:
>>  17             print factors;
>>  18         else:
>>  19             factors=factors-1;
>>  20
>>  21     else:
>>  22         factors=factors-1;
>>  23
>>
>> And it just gets frozen when I run it. I put a
>>
>> print "Loop completed"
>>
>> in one of the loops and it showed up just fine. So, there are two
>> possibilities:
>> 1. Its looping in the trillions and taking a while
>> 2. I have a forever loop somewhere
>>
>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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