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jasenka [17]
3 years ago
15

Suppose a book author can be identified by an AuthorID and each book can be identified by an ISBN. Besides the identifier, an au

thor and a book each has many other attributes like name, address, email, phone, and price, title, publisher, publish year, edition, etc. In general publishing business, an author may write no book or many books but every book must have at least one author.
Computers and Technology
1 answer:
Scrat [10]3 years ago
6 0

Answer:

a) We know that atleast one or more author writes a book.

Symbol to indicate one or more is (B)

So the correct option is B

b) We know that zero to multiple books are written by any author.

Symbol to indicate zero or more is (A)

So the correct option is A

c) The fourth option is correct if we replace by many to many relationship and generate a new entity.

So the relationship betweem author and contract is one to many. So we know that there is atleast one author that represent in symbol d and books has atleast 0 that represent in symbol c.

So Fourth Option is correct d at blue side and c at red side.

d) There are two forirgn keys in table Contract one is from AuthorId and other is ISBN.

So correcct option is C

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Write a function named enterNewPassword. This function takes no parameters. It prompts the user to enter a password until the en
zloy xaker [14]

Answer:

def enterNewPassword():

 while True:

   password = input("Enter password: ")

   has_digit = False

   for i in password:

     if i.isdigit():

       has_digit = True

       break

   

   if not has_digit or (len(password) < 8 or len(password) > 15):

     if len(password) < 8 or len(password) > 15:

       print("The password length must be between 8 and 15!")

     if not has_digit:

       print("The password must include at least one digit!")

   else:

     return password

print(enterNewPassword())

Explanation:

*The code is in Python.

Create a function named enterNewPassword that takes no parameter

Create an indefinite while loop. Inside the loop, ask the user to enter the password. Initialize the has_digit as False, this will be used to check if password contains a digit or not. Create a for loop, that that iterates through the password, if one character is digit, set the has_digit as True and stop the loop (Use isdigit() to check if the character is digit or not).

After the for loop, check if has_digit is false or the length of the password is not between 8 and 15. If the length of the password is not between 8 and 15, print the error. If has_digit is false, again print the error.

Otherwise, password met the requirements and return the password

Call the enterNewPassword() function and print the result

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