Question

PROBLEM 1 - FACTORIAL: Write a function prodN(n) taking as parameter an integer n.

• If n is positive, the function returns the product of the first n natural numbers.

• If n is zero, the function returns 1.

• If n is negative or is not an integer, the function returns None.

Remember to extensively test your program to make sure it works properly.

Answer 1

def prodN(n):
if type(n) != type(0) or n < 0:
return
result = 1
for i in range(1, n+1):
result = result * i
return result
  
print(prodN("Chegg"))
print(prodN(-20))
for i in range(1,6):
print(i, "prodN =", prodN(i))

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