TORONTO KIDS COMPUTER CLUB | Monday 20:00 Python Practice 21.05.17.
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Monday 20:00 Python Practice 21.05.17.

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:

  1. A recursive algorithm must have a base case.

  2. A recursive algorithm must change its state and move toward the base case.

  3. 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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