Explanation: Machine-to-machine technology is the technology that helps in sharing of the real time information of the device that have embedded sensor.They can work without the help of the manual factors.

The data is shared through the help of the radio signals in the devices like turbines vending machines etc for the tracking purpose and managing.

Thus the other options are incorrect because short distance is a disttance, cloud services are for the collection of services and databases contains the data. So, the correct option is option (b).

5 0

3 years ago

Determine the best access modifier for each of the following situations: a. A class Employee records the name, address, salary,

Lorico [155]

Answer:

a. Protected

b. Public

Explanation:

There are four acess modifier in Java.

Default: Acessible only within the same package.

Public: Can be acessed by any class.

Private: Acessible only within the class.

For example, you have a class employee and a private method. This method can only be accessed by an object that is an instance of an employee.

Protected: Used in classes that extend each other. For example, a class of employees would extend employee.

So:

a. A class Employee records the name, address, salary, and phone number.

The best acesses modifier is protected. A class may extended employee but have the same arguments(name, adress, salary, phone number), so it should also have acess to the method.

b. An adding method inside of a class BasicMath.

This method can be used in a variety of packages and projects and classes... and there is no important information regarding security. So the best method is public.

4 0

3 years ago

Write a program to calculate surface area and volume of a sphere (ball). The program will ask user to input radius (meter(s)) of

oee [108]

Answer:

The following program is to calculate the surface area and volume of a sphere(ball) using macro in c language .

#include <math.h> //header file for math functions

#define pi 3.1415 //using macro

#include <stdio.h> //header file for printf() or scanf()

int main() //main function

{

double radius; //radius is a double type variable

float surface_area, vol; //surface_area andvolume is a float type variable

printf("Enter the radius of the sphere : \n"); //printf() is use to print an output

scanf("%lf", &radius); //scanf() is use to take input from the user

surface_area = 4 * pi * pow(radius,2);

vol = (4.0/3) * pi * pow(radius,3);

printf("The Surface area of the sphere is: %.3f", surface_area); // display surface area

printf("\n Volume of the sphere is : %.3f", vol); // display volume

return 0;

}

Output:

Enter radius of the sphere : 4.4

Surface area of sphere is: 243.278

Volume of sphere is : 356.807

Explanation:

Here in this program we include the header file math.h and include the macro pi. after that taking the user input in radius and calculating the surface area and volume of sphere and finally display the result.

4 0

3 years ago