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anastassius [24]
3 years ago
15

Implement a program that manages shapes. Implement a class named Shape with a method area() which returns the double value 0.0.

Implement three derived classes named Rectangle, Square, and Circle. Declare necessary properties in each including getter and setter function and a constructor that sets the values of these properties. Override the area() function in each by calculating the area using the defined properties in that class.
Computers and Technology
1 answer:
Tamiku [17]3 years ago
8 0

Answer:

Explanation:

The following code is written in Python. It creates the parent class Shape and the three subclasses Rectangle, Square, and Circle that extend Shape. Shape has the constructor which is empty and the area method which returns 0.0, while the three subclasses take in the necessary measurements for its constructor. Each subclass also has getter and setter methods for each variable and an overriden area() method which returns the shapes area.

class Shape:

   def __init__(self):

       pass

   def area(self):

       return 0.0

class Square(Shape):

   _length = 0

   _width = 0

   def __init__(self, length, width):

       self._width = width

       self._length = length

   def area(self):

       area = self._length * self._width

       return area

   def get_length(self):

       return self._length

   def get_width(self):

       return self._width

   def set_length(self, length):

       self._length = length

   def set_width(self, width):

       self._width = width

class Rectangle(Shape):

   _length = 0

   _width = 0

   def __init__(self, length, width):

       self._width = width

       self._length = length

   def area(self):

       area = self._length * self._width

       return area

   def get_length(self):

       return self._length

   def get_width(self):

       return self._width

   def set_length(self, length):

       self._length = length

   def set_width(self, width):

       self._width = width

class Circle(Shape):

   _radius = 0

   def __init__(self, radius):

       self._radius = radius

   def area(self):

       area = 2 * 3.14 * self._radius

       return area

   def get_radius(self):

       return self._radius

   def set_radius(self, radius):

       self._radius = radius

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Answer:

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Explanation:

Main method is the entry point of a program, which means when you start you program the first thing to execute is the main method.

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// Your code here

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In the given display method you have int, double and char data types as a arguments. So in order to call display method you need to understand the datatype that you want to pass.

int only takes integers without decimal points.

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Below is the main method which will call the display method in a right way

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3 years ago
Write a method that computes the sum of the digits in an integer. Use the following method header: public static int sumDigits(l
kifflom [539]

Answer:

The java program for the given scenario is shown below.

import java.util.*;

import java.lang.*;

public class Test

{

   //variables to hold the number, digits and sum of the digits

   //variable to hold number is assigned any random value

   static long num=123;

   static int sum=0;

   static int digit;

   static int s;

   //method to add digits of a number

   public static int sumDigits(long n)

   { do

       {

           digit=(int) (n%10);

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           n=n/10;

       }while(n>0);

       return sum;

   }

public static void main(String[] args) {

    s = sumDigits(num);

 System.out.println("The sum of the digits of "+num+ " is "+s);  }

}

OUTPUT

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Explanation:

1. The variables to hold the number is declared as long and initialized.

2. The variables to store the digits of the number and the sum of the digits are declared as integer. The variable, sum, is initialized to 0.

3. The method, sumDigits(), is defined which takes a long parameter and returns an integer value. The method takes the number as a parameter and returns the sum of its digits.

4. Inside method, sumDigits(), inside the do-while loop, the sum of the digits of the parameter is computed.

5. Inside main(), the method, sumDigits(), is called. The integer value returned by this method is stored in another integer variable, s.

6. The sum of the digits is then displayed to the console.

7. All the variables are declared outside main() and at the class level and hence declared static. The method, sumDigits(), is also declared static since it is to be called inside main().

8. In java, the whole code is written inside a class since java is a purely object-oriented language.

9. In this program, object of the class is not created since only a single class is involved having main() method.

10. The program can be tested for any value of the variable, num.

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Answer:

The code to this question can be given as:

Code:

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{

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