Answer to Question #272142 in Python for Johanna Immanuel

Question

def countdown(n):

if n <= 0:

print('Blastoff!')

else:

print(n)

countdown(n-1)

Write a new recursive function countup that expects a negative argument and counts “up” from that number. Output from running the function should look something like this:

>>> countup(-3)

-3

-2

-1

Blastoff!

Write a Python program that gets a number using keyboard input. (Remember to use input for Python 3 but raw_input for Python 2.)

If the number is positive, the program should call countdown. If the number is negative, the program should call countup. Choose for yourself which function to call (countdown or countup) for input of zero.

Provide the following.

The code of your program.

Output for the following input: a positive number, a negative number, and zero.

An explanation of your choice for

Answer 1

def countup(n):


	if n >= 0:
		print('Blastoff!')
	else:
		print(n)
		countup(n+1)


def countdown(n):


	if n <= 0:
		print('Blastoff!')
	else:
		print(n)
		countdown(n-1)


n = int(input())
#it does not matter which function
#to use at zero The result will be the same
#In our case, we used countdown for zero
if n >= 0:
	countdown(n)
elif n < 0:
	countup(n)