Answer to Question #185194 in Python for FORTUNE AIDOO

Question

1. Copy the countdown function from below.

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.

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

Answer 1

Source Code
 
#define count down function
 def countdown(n):
 
   if n <= 0:
 
     print('Blastoff!')
 
   else:
 
     print(n)
 
     countdown(n-1)
 
 #define the countup function
 def countup(n):
 
   if n >=0:
 
     print('Blastoff!')
   else:
 
     print(n)
 
     countup(n+1)
 
 #main
 
 number=int(input("Enter a number: "))
 
 if number>0:
    print(countdown(number))
 
 elif number<0:
    print(countup(number))
 
 elif number==0:
    print(countup(number))
 
 
 
Outputs
1.     Positive input number
 
 
 
 
2.     Negative input number
 

 
3.     A zero input number