24 May Monday 20:00 Python Practice 21.05.17.
Question:
Use the recursion we have learn in the class, please try to create a function to recursively calculate the total of 1 + 2 + …. (n-2) + (n-1) + n
def total(n):
# please write you program below
total(int(input('Please enter a number:')))
Class Notes:
All recursive algorithms must obey three important laws:
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A recursive algorithm must have a base case.
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A recursive algorithm must change its state and move toward the base case.
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A recursive algorithm must call itself, recursively.
Sample program:
def listsum(numList):
if len(numList) == 1:
return numList[0]
else:
return numList[0] + listsum(numList[1:])
print(listsum([1,3,5,7,9]))
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