Answer:
through electronics we have a electrified lighted world. our homes,are lit with light using electricity. the stereo we listen to, electricity makes it happen. tv,computers, and record turntables all need electricity. electricity makes things possible that would otherwise be either impossible or very arduous. we see sounds and enjoy them. we watch entertaining movies. we read books and do our homework with the appreciated help of electricity.
I have a kindle paper white that I downloaded all of my avalible textbook onto if that helps I find it much better then carrying around a bunch of textbooks
Answer:
You will use the keyword extern to declare a variable at any place. Though you can declare a variable multiple times in your C program, it can be defined only once in a file, a function, or a block of code. Explanation:
Answer:
d) Online, real-time systems.
Explanation:
The options are:
a) Batch processing systems.
b) Personal computer systems.
c) Data compression systems.
d) Online, real-time systems.
And the correct option is D. Online, a real-time system. And this is because it is this which is characterized by the data which is assembled from more than one location as it is online, and various clients from various locations enter the data, and it's updated immediately, as it is a real-time system, which is updated in real-time. And hence D. is the correct option. The data compression system takes the data from one location at a time. The batch processing system is made up of different programs for input, output, and process. and hence is different from real-time, which requires continual all the three. And a PC is not made to a specific function, and it does different activities. Hence, its also not the right option here.
Answer:
Primary key retains its uniqueness even after you remove some of the fields.
Explanation:
I am assuming that this question is related to database. Therefore, I am answering it according to database context.
In database, you can have multiple rows and columns. Each column shows a specific attribute while each row plots the data according to the attributes. However, there is the first column of each of main table that has unique set of values. It is called the Primary Key. Some key features of primary key are:
- It always contains the unique value.
- Its value cannot be null.
- A table can have at max one primary key.
- It can be the combination of multiple columns but it must be unique.
Therefore, the primary key has the ability to retain its uniqueness even after you remove some of the fields.
