On 10/26/2013 2:20 PM, MRAB wrote:
On 26/10/2013 18:36, HC wrote:
I'm doing my first year in university and I need help with this basic
assignment.
Assignment: Write Python script that prints sum of cubes of numbers
between 0-200 that are multiples of 3. 3^3+6^3+9^3+12^3....+198^3=?
My script:
count = 0
answer = 0
while count<200:
if count%3==0:
answer = answer + count**3
count = count + 1
print ("Result is: " +str(answer))
Is it all okay?
Just one small point: the assignment says that the numbers should be in
the range 0-200, but the loop's condition is count<200 it's excluding
200, so the numbers will actually be in the range 0-199.
'Between 0-200' could well be interpreted to exclude both 0 and 200 and
to mean 'in 1-190'. Problem posers should be clear about ranges and
students should be careful to understand the problem given.
However, as 200 isn't a multiple of 3, it won't affect the result, but
in another assignment it might.
(For the record, this is known as an "off-by-one" error.)
Unfortunately common.
--
Terry Jan Reedy
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