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# -*- coding: utf-8 -*-
# 1 1 2 3 5 8 13 21 34 55 89
def Fib(n):
a, b = 0, 1 # a 是第零項; b 是第一項
while n:
a, b = b, a + b
n -= 1
print a #放在迴圈內就會列出所有數值
#print a #放在迴圈就只顯示那個最終加成的數值
# 做第一次之後, a 成為第一項;所以做四次,a 就是第四項
Fib(4)
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