#
# This program finds the average of the entered numbers
#   (using interactive approach)
#
#

def main():
    print("Hello!\nThis program finds the average of entered numbers.\n")

    sum_=0 # the sum of provided values
    counter=0 # counter for the number of provided values
    answer = "yes" # the answer

    while answer[0]=='y': # while the user says 'yes' or 'yeah' or 'yes'
        next_value=float(input("Please, input a number:")) # getting the next value
        sum_=sum_+next_value # adding to the sum
        counter=counter+1 # incrementing the number of added values
        answer=input("Do you want to input more numbers (yes or no)? ").lower()
        # getting users answer and converting it to lower case immediately

    average=float(sum_)/counter # average
    print("The average of the entered numbers, rounded off to the nearest hundredth,\
is {0:0.2f}".format(average))

main()