# Contract: total_attendance: void -> void
# Purpose: to ask user to enter number attending
#          each of an un-predetermined number of
#          performances, until they enter a -1 to
#          stop; then print to the screen the
#          total attendance at all those performances
# Example: if when total_attendance() is called, the
#          user types (when prompted) 10, 30, 20, -1,
#          the program should print to the screen:
# The total attendance is: 60

def total_attendance():

    # initializing needed variables

    total_so_far = 0
    num_performances = 0


    # get first attendance

    print "Please enter first attendance value, "
    current_attendance = int(raw_input("...or any negative number " +
                                       "to quit: "))
    max_so_far = current_attendance

    # adding up the total attendance at all performances 

    while (current_attendance >= 0):

        total_so_far = total_so_far + current_attendance
        num_performances = num_performances + 1

        if (current_attendance > max_so_far):
            max_so_far = current_attendance

        # NOTE that the following would ALSO make total_so_far
        # bigger by current_attendance:
        #  total_so_far += current_attendance 
 
        # get next attendance

        print "Please enter next attendance value, "
        current_attendance = int(raw_input("...or any negative number " +
                                       "to quit: "))

    # now print the total attendance

    print "The total attendance is: " + str(total_so_far)
    print "...over " + str(num_performances) + " performances"
    print "...and the largest single attendance is: " + str(max_so_far)

# Contract: max_profit: number number number -> number
# Purpose: compute and return the lowest ticket price with the
#          highest profit for ticket prices in the range
#          from <lowest_price> to <highest_price> (inclusive
#          I hope) with ticket prices <price_diff> apart
# Examples: max_profit(5.0, 5.0, .1) == 5.0
#           max_profit(4.5, 5.0, .1) == 4.5

from profit_ex import *

def max_profit(lowest_price, highest_price, price_diff):

    # initializing variables

    curr_ticket_price = lowest_price
    max_profit_so_far = profit(lowest_price)
    max_profit_ticket_price = lowest_price

    # check the profit for each ticket in the range,
    #    looking for the highest profit

    while (curr_ticket_price <= highest_price):

        curr_profit = profit(curr_ticket_price)

        if (curr_profit > max_profit_so_far):
            max_profit_so_far = curr_profit
            max_profit_ticket_price = curr_ticket_price

        curr_ticket_price = curr_ticket_price + price_diff

    # return the ticket price for maximum profit!

    return max_profit_ticket_price