<span>Words or names defined by the programmers are called as programmer defined symbols or identifiers. These are called as variables which are just simple storage locations and making available for the program to use. No two variables are same in the code of the program.</span>
Answer:
An operating system, or "OS," is software that communicates with the hardware and allows other programs to run
Answer:
The code to calculate the area of a circle is:
from math import pi
def circleArea(radius):
if radius > 0:
return pi * (radius ** 2)
else:
return None
if __name__ == '__main__':
radius = 5
print("Radius: {} Area: {}".format(radius,circleArea(radius)))
Explanation:
A detailed explanation of each line of code is given below.
#Define the number pi used to calculate the area
from math import pi
#We define a function that calculates the area of a circle
def circleArea(radius):
#Check if the radius is valid ( radius > 0) since there aren´t negative radius
if radius > 0:
#Compute the area formula for a circle 
return pi * (radius ** 2)
else:
#Return None if the radius is invalid
return None
#Run the function we´ve defined
if __name__ == '__main__':
#Define a radius
radius = 5
#Call the function and parse the radius through it, then print the result
print("Radius: {} Area: {}".format(radius,circleArea(radius)))
Answer:
The correct answer to the following question will be "Encapsulation".
Explanation:
The wrapping of the data into a single unit or the method by which a header is applied to the data inherited from the above layer is termed as Encapsulation.
While relating to networking, encapsulation would be the method of storing and converting data through one protocol into another, so that the data can proceed over a network. A TCP/IP package contained under an ATM system, for example, is indeed a kind of encapsulation.
Therefore, Encapsulation is the right answer.