#On the name of ALLAH
#Author : Fouad Teniou
#Date : 13/01/09
#version :2.4
import random
class NegativeNumberError(ArithmeticError):
""" attempted imporper operation on negative number"""
pass
class ZeroNumberException(ArithmeticError):
""" attempted operation on zero with an agreed solution"""
pass
def errors(number):
""" Raises NegativeNumberError if number less than 0, and
raises ZeroNumberException if number is equal to 0."""
if number < 0:
raise NegativeNumberError,\
"\n<The number must be greater or equal to 0 \n"
elif number == 0:
raise ZeroNumberException,\
"\n<It is agreed per convention that 0!= 1 \n"
elif number >0:
pass
return number
while 1:
#get users answer to use Factorial program or exit the while loop
Answer = raw_input("\n<Would you like to use Factorial program, yes or no?:\t")
if Answer == "yes":
print '\n\t\t\t','','\5'*49
print '\t\t\t\t Welcome to Factorial n! Program'
print '\t\t\t','','\5'*49,'\n'
try:
#get users entered numbers and compute factorial
userValue = float(raw_input('<Please enter a number :\t'))
errors(userValue)
Y=random.randrange(int(userValue)+1)
mult = lambda d:reduce(lambda x,y:x*y,range(1,int(Y)+1))
print '\n<A random list of factorial between 0 and %s will be displayed' % int(userValue)
print '\n\t\t',str(0)+'!=',int(1),'\n'
for Y in range(1,int(Y)+1):
print '\n\t\t',str(Y)+'!=',mult(int(Y)),'\n'
#Factorial raise ValueError if input is not numerical
except ValueError:
print "\n<The entered value is not a number"
#Factorial raises Negative number exception
except NegativeNumberError,exception:
print exception
#Factorial raises zero number exception
except ZeroNumberException,exception:
print exception
elif Answer == "no":
break
#############################################################################
#c:\hp\bin\Python>python "C:\Documents\Programs\classes\Factorial7
#
#<Would you like to use Factorial program, yes or no?: yes
#
# ?????????????????????????????????????????????????
# Welcome to Factorial n! Program
# ?????????????????????????????????????????????????
#
#<Please enter a number : 7
#
#<A random list of factorial between 0 and 7 will be displayed
#
# 0!= 1
#
#
# 1!= 1
#
#
# 2!= 2
#
#
#<Would you like to use Factorial program, yes or no?: yes
#
# ?????????????????????????????????????????????????
# Welcome to Factorial n! Program
# ?????????????????????????????????????????????????
#
#<Please enter a number : -7
#
#"\n<The number must be greater or equal to 0 \n"
#
#
#<Would you like to use Factorial program, yes or no?: yes
#
# ?????????????????????????????????????????????????
# Welcome to Factorial n! Program
# ?????????????????????????????????????????????????
#
#<Please enter a number : 0
#
#<It is agreed per convention that 0!= 1
#
#
#<Would you like to use Factorial program, yes or no?: yes
#
# ?????????????????????????????????????????????????
# Welcome to Factorial n! Program
# ?????????????????????????????????????????????????
#
#<Please enter a number : test
#
#<The entered value is not a number
#
#<Would you like to use Factorial program, yes or no?: yes
#
# ?????????????????????????????????????????????????
# Welcome to Factorial n! Program
# ?????????????????????????????????????????????????
#
#<Please enter a number : 7
#
#<A random list of factorial between 0 and 7 will be displayed
#
# 0!= 1
#
#
# 1!= 1
#
#
# 2!= 2
#
#
# 3!= 6
#
#
# 4!= 24
#
#
# 5!= 120
#
#
#<Would you like to use Factorial program, yes or no?: no
#
#c:\hp\bin\Python>
########################### Factorial ref FT (2 D A Missr)
#
