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Pseudocode FOR Task1, 2 & 3

Task 1

Allow auction company to enter item details.

product_selling <-- 0  
OUTPUT "Welcome to auction software."

OUTPUT "Enter how many items you want to sell?"
INPUT product_selling
WHILE product_selling < 10 
        DO product_selling
	OUTPUT "Enter how many items you want to sell?"
	INPUT product_selling
	OUTPUT "Error, please enter more than 10 products."
ENDWHILE
OUTPUT "Number valid."

DECLARE name_list : ARRAY[1] OF STRING
DECLARE bid_number_list : ARRAY[1 : product_selling] OF INTEGER  
DECLARE description_list : ARRAY[1 : product_selling] OF STRING  
DECLARE reserve_price_list : ARRAY[1 : product_selling] OF FLOAT 
DECLARE item_number_list : ARRAY[1, product_selling] OF INTEGER

FOR counter <-- 1 TO product_selling
    OUTPUT "Please enter your item name, item description and item price"
    INPUT _name, _description, _price
    name_list[counter] <-- _name
    description_list[counter] <-- _description
    reserve_price_list[counter] <-- _price
NEXT

Task 2

Allow buyers to purchase

FOR i 1 TO product_selling
	highest_bid_list[i] <-- 0.0 
	item_highest_bid_holder_list[i] <-- ""
NEXT
FOR i 1 TO 6
	buyer_number_list[i] <--  i
NEXT
buyer_number_check <-- "0"  
cookie <-- False  
WHILE purchase_status <-- "no" DO
    OUTPUT "Welcome to auction! "
    FOR counter_2 <-- 1 TO name_list
        _item_num <-- item_number_list[counter_2]
        current_item_name <-- name_list[counter_2]
        OUTPUT _item_num, ": ", current_item_name 
    NEXT
    CASE buyer_number_check OF
        "0": OUTPUT "IF you want to bid, please enter your buyer number" INPUT buyer_number_check
        "exit": BREAK
    ENDCASE
    WHILE buyer_number_check IN buyer_number_list DO
        IF NOT cookie
            THEN OUTPUT "Identity verified."
            INPUT item_to_buy
        ENDIF
        IF item_to_buy NOT IN name_list
            THEN OUTPUT "Item number invalid, try again."
            CONTINUE
        ENDIF
        search_index <-- name_list.index(item_to_buy)  
        current_description <-- description_list[search_index]
        item_highest_bid <-- highest_bid_list[search_index]
        OUTPUT "Details: ", current_description
        OUTPUT "Current highest bit is ", item_highest_bid

        REPEAT
            INPUT buyer bid
            IF buyer_bid > item_highest_bid
                THEN item_highest_bid <-- buyer_bid
                highest_bid_list[search_index] <-- item_highest_bid
                bid_number_list[search_index] <-- bid_number_list[search_index] + 1
                item_highest_bid_holder_list[search_index] <-- buyer_number_check
                OUTPUT "Congratulation! Your bid is the current highest bid."
                cookie <-- True
                BREAK
            ELSE
                 OUTPUT("Sorry, bid lower than current highest bid. Try again.")
            ENDIF
            INPUT purchase_status("Do you want to bid FOR another item? Y/N")
        UNTIL purchase_status = "n"
        IF buyer_number_check NOT IN buyer_number_list
            THEN OUTPUT "Buyer number invalid, try again. " 
            buyer_number_check <-- "0"
        ENDIF
    ENDWHILE
ENDWHILE

Task 3

Calculate and show statistics

DECLARE highest_price_list : ARRAY[] OF INTEGER
DECLARE under_reserve_price_list : ARRAY[] OF INTEGER
DECLARE no_bid_list : ARRAY[] OF INTEGER
FOR i <-- 1 TO product_selling
	sold_status_list[i] <-- ""
NEXT
total_price <-- 0
FOR counter_3 <-- 1 TO highest_bid_list
    IF highest_bid_list[counter_3] = 0
        THEN no_bid_list[counter] <-- counter_3
        sold_status_list[counter_3] <-- "no"
    ENDIF
    IF highest_bid_list[counter_3] < reserve_price_list[counter_3] AND highest_bid_list[counter_3] <> 0
        THEN under_reserve_price_list[counter_3] <-- counter_3
        sold_status_list[counter_3] <-- "no"
    ENDIF
    IF highest_bid_list[counter_3]) > reserve_price_list[counter_3])
        THEN highest_price_list[counter_3] <-- counter_3
        sold_status_list[counter_3] <-- "yes"
        total_price <-- total_price + highest_bid_list[counter_3] * 1.1
    ENDIF
NEXT

OUTPUT "Total price is $", total_price
OUTPUT "following item has at least 1 bid, but the bid is lower than the reserve price:", under_reserve_price_list
OUTPUT "following item has no bid at all: ", no_bid_list

sold_item_quantity <-- length(highest_price_list)
under_reserve_price_item_quantity <-- length(under_reserve_price_list)
no_bid_quantity <-- length(no_bid_list)
OUTPUT sold_item_quantity, " is/are sold."
OUTPUT under_reserve_price_item_quantity, " is/are lower than reserve price."
OUTPUT no_bid_quantity, " has/have no bids."