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labwork [276]
3 years ago
8

Consider the following classes: public class Vehicle {...} public class Car extends Vehicle {...} public class SUV extends Car {

...} Self-Check Problems 617 Which of the following are legal statements? a. Vehicle v = new Car(); b. Vehicle v = new SUV(); c. Car c = new SUV(); d. SUV s = new SUV(); e. SUV s = new Car(); f. Car c = new Vehicle();
Computers and Technology
1 answer:
Kitty [74]3 years ago
7 0

Answer:

Legal statements:

      SUV s = new SUV();

      Car c = new SUV();

      Vehicle v = new SUV();

      Vehicle v1 = new Car();

illegal statements:

      SUV s1 = new Car();

      Car c1 = new Vehicle();

Explanation:

The options a, b, c, d are correct and legal statements because the syntax is correct, they follow the inheritance principles and therefore can be used for type cast.

The options e, f are incorrect and illegal statements because they do not follow the inheritance principles and therefore can not be used for type cast.

You might be interested in
Sam wants to move across the text and his documents to add data at predefined stops. Which key will Hughes to navigate through t
Setler [38]

Answer:

The TAB key

Explanation:

Sam would use the TAB key, located on the left side of the keyboard, to move around his document to add stops and format its information properly.

Pressing the TAB key will introduce a tab code in his document, which is like moving ahead by a certain number of spaces (5,6, 10 spaces for example, depending on the configuration of the document), but without using spaces, using a tab which is a much better option to position, align things up.

5 0
3 years ago
To plan a pizza party, one may want to order enough pizza for everyone. Use the slicesPerPizza, slicesPerGuest, and totalGuests
attashe74 [19]

Answer:

import java.util.Scanner;

public class num6 {

   public static void main(String[] args) {

       Scanner in = new Scanner(System.in);

       System.out.println("Enter number of guest");

   int totalGuest = in.nextInt();

       System.out.println("Enter number of slices per guest");

   int slicesPerGuest = in.nextInt();

       System.out.println("How many Slices are on a pizza");

   int slicesPerPizza = in.nextInt(); // Assume each pizza has 5 slices

   double pizzasNeeded;

       //Calculating the pizza Needed

    int totalslicesNeeded  = totalGuest * slicesPerGuest;

    pizzasNeeded = totalslicesNeeded/slicesPerPizza;

       System.out.println(pizzasNeeded);

   }

}

Explanation:

In this program User is required to enter values for the variables totalGuest, slicesPerGuest  and slicesPerPizza

First calculate the totalSlices needed by totalGuest * slicesPerGuest;

The calculate number of pizzas needed by totalslicesNeeded/slicesPerPizza;

4 0
3 years ago
Type which type of interference we will install after installing operating system​
pentagon [3]

Answer:

There are different kinds of operating systems: such as Windows, Linux and Mac OS

There are also different versions of these operating systems, e.g. Windows 7, 8 and 10

Operating systems can be used with different user interfaces (UI): text user interfaces (TUI) and graphical user interfaces (GUI) as examples

Graphical user interfaces have many similarities in different operating systems: such as the start menu, desktop etc.

When you can recognize the typical parts of each operating system’s user interface, you will mostly be able to use both Windows and Linux as well as e.g. Mac OS.

THE ROLE OF OPERATING SYSTEM IN THE COMPUTER

An operating system (OS) is a set of programs which ensures the interoperability of the hardware and software in your computer. The operating system enables, among other things,

the identification and activation of devices connected to the computer,

the installation and use of programs, and

the handling of files.

8 0
3 years ago
Date Time Manipulation Exploration If you start from Jan 1st, 1757, and repeatedly add 8 days, until you hit 1800, how many time
zimovet [89]

Answer:

from datetime import datetime, date, timedelta

def count_weekdays(start_date, add_days, stop_year, weekday):

   my_date = start_date

   m = 0  

   while my_date.year != stop_year:  

       my_date = my_date + timedelta(days = add_days)

       if my_date.isoweekday() == weekday:

           m += 1

   return m

date_val = date(1757,1,1)

try:

   date_val = datetime.fromisoformat(input("Enter date in the format yyyy-mm-dd: "))

except ValueError:

   print("Wrong isoformat string")

print(count_weekdays(date_val, 8, 1800, 1))

Explanation:

The datetime package of the python programming language has several time modules like the date, datetime, pytz, timedelta, etc, used to manipulate date and time in documents. The function count_weekdays has four parameters and returns the number of a specified weekday in a period of time.

4 0
3 years ago
Write an if/else statement that compares the double variable pH with 7.0 and makes the following assignments to the int variable
levacccp [35]

Answer:

if (pH<7.0){

          neutral=0;

          base=0;

          acid=1;

      }

      else if (pH>7.0){

          neutral=0;

          base=1;

          acid=0;

      }

      else if (pH==7.0){

          neutral=1;

          base=0;

          acid=0;

      }

Explanation:

As required by the question, if and else statements have been used to test the value of the pH and assign the apropriate values to the variables neutral, base and acid.

The code snippet below can be used to prompt the user to enter values for pH

<em>import java.util.Scanner;</em>

<em>public class pHTest {</em>

<em>   public static void main(String[] args) {</em>

<em>      Scanner scr = new Scanner(System.in);</em>

<em>       System.out.println("Enter a value for the pH");</em>

<em>       int neutral, base, acid;</em>

<em>       double pH = scr.nextDouble();</em>

<em> if (pH<7.0){</em>

<em>           neutral=0;</em>

<em>           base=0;</em>

<em>           acid=1;</em>

<em>       }</em>

<em>       else if (pH>7.0){</em>

<em>           neutral=0;</em>

<em>           base=1;</em>

<em>           acid=0;</em>

<em>       }</em>

<em>       else if (pH==7.0){</em>

<em>           neutral=1;</em>

<em>           base=0;</em>

<em>           acid=0;</em>

<em>       }</em>

<em>} }</em>

4 0
3 years ago
Read 2 more answers
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