def check_length_and_alter(number1, number2):
#check for size
length1 = count_no_of_elements(number1)
length2 = count_no_of_elements(number2)
if length1 != length2:
diff = abs(length1-length2)
if length1> length2:
#number2 = insert_in_front(number2, diff)
for i in range(diff):
number2 = linked_list_insert(number2, 0)
else:
#number1 = insert_in_front(number1, diff)
for i in range(diff):
number1 = linked_list_insert(number1, 0)
return number1, number2
def add_two_numbers(number1, number2):
if number1 == None or number2 == None:
return
added_sum = None
carry = 0
#make it same size
number1, number2 = check_length_and_alter(number1, number2)
# same size
while number1 != None and number2 != None:
sum = number1.contents + number2.contents + carry
carry = 0
if sum >= 10:
carry += 1
sum = sum%10
added_sum = linked_list_insert(added_sum, sum)
#print "number1: {0}, number2: {1}, add: {2}, node: {3}".format(number1, number2, sum, added_sum)
# if carry>0:
# print "carry : ", carry
number1 = number1.next
number2 = number2.next
return added_sum
