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Tomtit [17]
3 years ago
9

python There is a reference variable office_a_c of type AirConditioner. Create a new object of type AirConditioner using the off

ice_a_c reference variable. After that, turn the air conditioner on using the reference to the new object.
Computers and Technology
1 answer:
Kay [80]3 years ago
8 0

Answer:

  1. class AirConditioner:
  2.  def __init__(self, a_c=False):
  3.    self.office_a_c = a_c  
  4. ac = AirConditioner()
  5. ac.office_a_c = True

Explanation:

Firstly, create a class and name it as AirConditioner (Line 1).

Next in the class constructor, create the reference variable office_a_c (Line 3). Please note the reference variable shall be preceded with a self keyword. Besides, the reference variable is set to False by default.

Create an AirConditioner object (Line 6) and then use the dot syntax (.) to set the object reference variable office_a_c to True.

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IT professionals recognize that successful systems must be user-oriented, and users need to be involved, formally or informally,
elixir [45]

Answer: True

Explanation:

System development is the process in which a system is developed,planned, designed,tested, modified etc. Analysis of design,internal structure and external factors is done for implementation to creation of system.

  • An IT professional is responsible for performing various tasks in system development.He/she has to analyze and detect that the developed system is convenient for user.
  • Involvement of user also plays an important part in system development through various ways such as improvement in system, smooth implementation,innovation,enhancing quality etc.
  • So, user can be involved in official or unofficial manner for betterment of system development.
  • Thus, the given statement is true.
3 0
3 years ago
[1] Please find all the candidate keys and the primary key (or composite primary key) Candidate Key: _______________________ Pri
AVprozaik [17]

Answer:

Check the explanation

Explanation:

1. The atomic attributes can't be a primary key because the values in the respective attributes should be unique.

So, the size of the primary key should be more than one.

In order to find the candidate key, let the functional dependencies be obtained.

The functional dependencies are :

Emp_ID -> Name, DeptID, Marketing, Salary

Name -> Emp_ID

DeptID -> Emp_ID

Marketing ->  Emp_ID

Course_ID -> Course Name

Course_Name ->  Course_ID

Date_Completed -> Course_Name

Closure of attribute { Emp_ID, Date_Completed } is { Emp_ID, Date_Completed , Name, DeptID, Marketing, Salary, Course_Name, Course_ID}

Closure of attribute { Name , Date_Completed } is { Name, Date_Completed , Emp_ID , DeptID, Marketing, Salary, Course_Name, Course_ID}

Closure of attribute { DeptID, Date_Completed } is { DeptID, Date_Completed , Emp_ID,, Name, , Marketing, Salary, Course_Name, Course_ID}

Closure of attribute { Marketing, Date_Completed } is { Marketing, Date_Completed , Emp_ID,, Name, DeptID , Salary, Course_Name, Course_ID}.

So, the candidate keys are :

{ Emp_ID, Date_Completed }

{ Name , Date_Completed }

{ DeptID, Date_Completed }

{ Marketing, Date_Completed }

Only one candidate key can be a primary key.

So, the primary key chosen be { Emp_ID, Date_Completed }..

2.

The functional dependencies are :

Emp_ID -> Name, DeptID, Marketing, Salary

Name -> Emp_ID

DeptID -> Emp_ID

Marketing ->  Emp_ID

Course_ID -> Course Name

Course_Name ->  Course_ID

Date_Completed -> Course_Name

3.

For a relation to be in 2NF, there should be no partial dependencies in the set of functional dependencies.

The first F.D. is

Emp_ID -> Name, DeptID, Marketing, Salary

Here, Emp_ID -> Salary ( decomposition rule ). So, a prime key determining a non-prime key is a partial dependency.

So, a separate table should be made for Emp_ID -> Salary.

The tables are R1(Emp_ID, Name, DeptID, Marketing, Course_ID, Course_Name, Date_Completed)

and R2( Emp_ID , Salary)

The following dependencies violate partial dependency as a prime attribute -> prime attribute :

Name -> Emp_ID

DeptID -> Emp_ID

Marketing ->  Emp_ID

The following dependencies violate partial dependency as a non-prime attribute -> non-prime attribute :

Course_ID -> Course Name

Course_Name ->  Course_ID

So, no separate tables should be made.

The functional dependency Date_Completed -> Course_Name has a partial dependency as a prime attribute determines a non-prime attribute.

So, a separate table is made.

The final relational schemas that follows 2NF are :

R1(Emp_ID, Name, DeptID, Marketing, Course_ID, Course_Name, Date_Completed)

R2( Emp_ID , Salary)

R3 (Date_Completed, Course_Name, Course_ID)

For a relation to be in 3NF, the functional dependencies should not have any transitive dependencies.

The functional dependencies in R1(Emp_ID, Name, DeptID, Marketing, Date_Completed) is :

Emp_ID -> Name, DeptID, Marketing

This violates the transitive property. So, no table is created.

The functional dependencies in R2 (  Emp_ID , Salary) is :

Emp_ID -> Salary

The functional dependencies in R3 (Date_Completed, Course_Name, Course_ID) are :

Date_Completed -> Course_Name

Course_Name   ->  Course_ID

Here there is a transitive dependency as a non- prime attribute ( Course_Name ) is determining a non-attribute ( Course_ID ).

So, a separate table is made with the concerned attributes.

The relational schemas which support 3NF re :

R1(Emp_ID, Name, DeptID, Course_ID, Marketing, Date_Completed) with candidate key as Emp_ID.

R2 (  Emp_ID , Salary) with candidate key Emp_ID.

R3 (Date_Completed, Course_Name ) with candidate key Date_Completed.

R4 ( Course_Name, Course_ID ).  with candidate keys Course_Name and Course_ID.

6 0
3 years ago
What is Roko's Basilisk?
serious [3.7K]

Answer:

Roko’s basilisk is a thought experiment proposed in 2010 by the user Roko on the Less Wrong community blog. Roko used ideas in decision theory to argue that a sufficiently powerful AI agent would have an incentive to torture anyone who imagined the agent but didn't work to bring the agent into existence.

7 0
3 years ago
Suppose you are given a sequence that is described by a formula, starting at index n=0. If you need to change the starting index
Arisa [49]

Answer:

n+1

Explanation:

Given

n = 0 --- starting index

Required

Change the starting index to n = 1

We have:

n = 0

To change the starting index to k, we simply rewrite as:

n+k

<em>In this case; k=1; so, the starting index will be: </em>n+1<em />

3 0
3 years ago
“What does it mean when we “rework” copyrighted material?”
Alja [10]
We use ideas and thoughts that have already been protected by the law which is called Copyright. We reworking copyright material means we are taking somebody's ideas and calling it ours. Which is not right by the law.
3 0
3 years ago
Read 2 more answers
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