#Function CAN CHANGE the list values
#and changes will be PRESERVED outside of 
#the function

#write a function make_zero that has
#one parameter - integer
#function changes the value of the 
#parameter to be 0

#write a function make_zero_list that
#has one parameter - LIST of integers
#the function changes all elements of list
#to be zero

#call both function in MAIN and observe the
#result


def make_zero(a):
	a=0

def make_zero_list(my_list):
	length=len(my_list)
	for i in range(length):
		my_list[i]=0

def main():

	a = 5
	a_list=[12, 3, 4, 5, -12]

	print("BEFORE FUNCTIONS")
	print("a = ", a)
	print("a_list=", a_list)

	make_zero(a)
	make_zero_list(a_list)

	print("AFTER FUNCTIONS")
	print("a = ", a)
	print("a_list=", a_list)
main()