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16-Calculatethe following using 2’ complement directly:       1 1 1 0 1 1 0 1                                                                                                                                                                                 1 0 1 1 0 1 1 1    _                                                                                                                                        17-Calculatethe following using 1’ and 2’ complements by order.                                                                                                              1  0   0   0  0   0   1  1                             0  1   1   0  1   0  0  1   _    
                                                                  Based on table 1.7,    page-41  18-Writethe ASCII code of four characters from your first name.19-Writethe ASCII code of four characters from your father’s name.20-Writethe ASCII code of four characters from your grandfather’s name.
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 Consider an online auction database system in which members (buyers and sellers) participate in the sale of items. The data requirements for this system are summarized as follows:  The online site has members who are identified by a unique member id and are described by an email address, their name, a password, their home address, and a phone number.  A member may be a buyer or a seller. A buyer has a shipping address recorded in the database. A seller has a bank account number and routing number recorded in the database.  Items are placed by a seller for sale and are identified by a unique item number assigned by the system. Items are also described by an item title, an item description, a starting bid price, bidding increment, the start date of the auction, and the end date of the auction.  Items are also categorized based on a fixed classification hierarchy (for example a modem may be classified as /COMPUTER/HARDWARE/MODEM).  Buyers make bids for items they are interested in. A bidding price and time of bid placement is recorded. The person at the end of the auction with the highest bid price is declared the winner and a transaction between the buyer and the seller may proceed soon after.  Buyers and sellers may place feedback ratings on the purchase or sale of an item. The feedback contains a rating between 1 and 10 and a comment. Note that the ratings are placed on a completed transaction by the buyer or seller of the item in the transaction. Construct an Entity-Relationship diagram for the auction database
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Read the following case study, which describes the data requirements for a video rentalcompany. The video rental company has several branches throughout the BAHRAIN. The data held on each branch is the branch address made up of street, city, state, and zip code, and the telephone number. Each branch is given a branch number, which is unique throughout the company. Each branch is allocated staff, which includes a Manager. The Manager is responsible for the day-today running of a given branch. The data held on a member of staff is his or her name, position, and salary. Each member of staff is given a staff number, which is unique throughout the company. Each branch has a stock of videos. The data held on a video is the catalog number, video number, title, category, daily rental, cost, status, and the names of the main actors, and the director. The catalog number uniquely identifies each video. However, in most cases, there are several copies of each video at a branch, and the individual copies are identified using the video number. A video is given a category such as Action, Adult, Children, Drama, Horror, or Sci-Fi. The status indicates whether a specific copy of a video is available for rent. Before hiring a video from the company, a customer must first register as a member of a local branch. The data held on a member is the first and last name, address, and the date that the member registered at a branch. Each member is given a member number, which is unique throughout all branches of the company. Once registered, a member is free to rent videos, up to maximum of ten at any one time. The data held on each video rented is the rental number, the full name and number of the member, the video number, title, and daily rental, and the dates the video is rented out and date returned. The rental number is unique throughout the company.Construct an Entity-Relationship diagram for the video rental company database. 
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