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simple python program help |
iantharan
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Posts: 27
Location: right behind you...
Joined: 14.04.08
Rank: Hacker Level 3 |
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so i've starting learning python, and im writing a basic program that finds all the multiples of 3 and 5 between 1 and 1000, and returns the sum. Can't seem to get it to work, not sure why :angry:
heres the code
num=1
sum=0
sum1=0
a=num%3
b=num%5
while num < 1000:
if a==0:
sum=num+sum
elif b==0:
sum1=num+sum
num=num+1
print sum+sum1
Edited by iantharan on 12-12-09 12:38 |
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RE: simple python program help |
stdio
Member
Posts: 375
Location: omnipresent
Joined: 06.04.08
Rank: God |
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iantharan wrote:
so i've starting learning python, and im writing a basic program that finds all the multiples of 3 and 5 between 1 and 1000, and returns the sum. Can't seem to get it to work, not sure why :angry:
heres the code
num=1
sum=0
sum1=0
a=num%3
b=num%5
while num < 1000:
if a==0:
sum=num+sum
elif b==0:
sum1=num+sum
num=num+1
print sum+sum1
You want your a and b inside the loop
num=1
sum=0
sum1=0
while num < 1000:
a=num%3
b=num%5
if a==0:
sum=num+sum
elif b==0:
sum1=num+sum1
num=num+1
print sum+sum1
a few more edits: your sum1=num+sum should be sum1=num+sum1
also here is a more appropriate way of doing this
sum=0
for i in range(0,1000):
if i%3==0 or i%5==0:
sum+=i
print sum
note neither one actually include 1000 which is a multiple of 5, easy enough to change though.
I'm sorry, I cant hear you over the sound of how awesome I am!
Edited by stdio on 12-12-09 14:03 |
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RE: simple python program help |
wolfmankurd
Member
Posts: 1519
Location: UK
Joined: 30.05.05
Rank: God |
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iantharan wrote:
so i've starting learning python, and im writing a basic program that finds all the multiples of 3 and 5 between 1 and 1000, and returns the sum. Can't seem to get it to work, not sure why :angry:
heres the code
num=1
sum=0
sum1=0
a=num%3
b=num%5
while num < 1000:
if a==0:
sum=num+sum
elif b==0:
sum1=num+sum
num=num+1
print sum+sum1
stdio's code is idiomatic.
but think it's worth pointing out why your code failed anyways, you seem to thinkg that a=num%3 will make a into a list of variables. but it doesn't it just does a=1%3 (ie 1.)
instead, you need a re-evaluted each time you check. so you need it in the while loop!
Also, once it's there you may aswell drop the whole thing and put them in the if clauses ( as in num%3==0).
Then it's a short step (which you would have taken had you known about the or keyword) to something similar to stdio's.
Again the use of range is just know about that technique and with compound arithmetic.
On the whole good effort!
BY READING MY POST, YOU ACCEPT IT AS IS AND AGREE TO MY DISCLAIMER OF ALL WARRANTIES, EXPRESS OR IMPLIED, AS WELL AS DISCLAIMERS OF ALL LIABILITY, DIRECT, INDIRECT, CONSEQUENTIAL OR INCIDENTAL, THAT MAY ARISE FROM THE USE OF THIS (MIS)INFORMATION.
Edited by wolfmankurd on 12-12-09 16:21 |
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