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Happy Coding
Recursion
BabbleDay
posted @ 2015年7月01日 03:57
in 刷题防身
with tags
composingprograms.com recursion python
, 645 阅读
ComposingPrograms 1.7 Exercises
def countdown(n):
print(n)
if n>1:
countdown(n-1)
def countup(n):
if n>0:
countup(n-1)
print(n)
def recursive(m,n):
if n>0:
return m + recursive(m, n-1)
else:
return 0
def expt(base, power):
if power==0:
return 1
else:
return base * expt(base, power-1)
def sum_digits(n):
if n<10:
return n
else:
return n%10 + sum_digits(n//10)
def is_prime(n, d):
if n<=1:
return False
elif d==1:
return True
elif n%d==0:
return False
else:
return is_prime(n, d-1)
def sum_primes_up_to(n):
if n==2:
return 2
elif is_prime(n, n-1):
return sum_primes_up_to(n-1) + n
else:
return sum_primes_up_to(n-1)
2019年6月04日 15:28
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2022年8月03日 06:54
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2022年9月27日 21:05
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