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```#On the name of ALLAH
#Author : Fouad Teniou
#Date : 9/05/09
#version :2.4

"""

OddEvenRecursion program uses a recursion function
to calculate the sum of odd or even numbers less or equal
to the odd or the even number entered by the user
and it produce a set of these numbers.

"""

# Starting with an empty list.
list_A = []

def OddEvenRecursion(number):
""" Returns a set and a sum of numbers in the set using recursion """

try:
#Append the list with odd or even numbers
list_A.append(number)

if number == 0 or number == 1 or number == -1:
# Display the even numbers' set and the sum of these numbers
print "\n<The numbers' set : %s \n\n<And the sum is :" % \
list_A
return number
elif number < 1:
return number + OddEvenRecursion(number + 2)
else:
return number + OddEvenRecursion(number - 2)

except TypeError:
print 'Please enter an integer.'

if __name__ == "__main__":

# testing an odd value.
odd = OddEvenRecursion(7)
print odd
# Empty the list
del list_A[:]
# testing a negative odd  value.
negativeOdd = OddEvenRecursion(-7)
print negativeOdd
# Empty the list
del list_A[:]
# testing an even value.
even = OddEvenRecursion(8) # testing an even value.
print even
# Empty the list
del list_A[:]
# testing a negative even value.
negativeEven = OddEvenRecursion(-8) # testing an even value.
print negativeEven

-----------------------------------------------------------------------------------------------

# c:\Python26>python "C:\Users\Fouad Teniou\OddEvenR7

# <The numbers' set : [7, 5, 3, 1]

# <And the sum is :
# 16

# <The numbers' set : [-7, -5, -3, -1]

# <And the sum is :
# -16

# <The numbers' set : [8, 6, 4, 2, 0]

# <And the sum is :
# 20

# <The numbers' set : [-8, -6, -4, -2, 0]

# <And the sum is :
# -20

# c:\Python26>
# Ref XM + DA
```

### History

• revision 6 (12 years ago)
• previous revisions are not available