Project Euler 2: (Iron)Python
- by Ben Griswold
In my attempt to learn (Iron)Python out in the open, here’s my solution for Project Euler Problem 2.
As always, any feedback is welcome.
# Euler 2
# http://projecteuler.net/index.php?section=problems&id=2
# Find the sum of all the even-valued terms in the
# Fibonacci sequence which do not exceed four million.
# Each new term in the Fibonacci sequence is generated
# by adding the previous two terms. By starting with 1
# and 2, the first 10 terms will be:
# 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
# Find the sum of all the even-valued terms in the
# sequence which do not exceed four million.
import time
start = time.time()
total = 0
previous = 0
i = 1
while i <= 4000000:
if i % 2 == 0: total +=i
# variable swapping removes the need for a temp variable
i, previous = previous, previous + i
print total
print "Elapsed Time:", (time.time() - start) * 1000, "millisecs"
a=raw_input('Press return to continue')
