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MariettaO [177]
3 years ago
7

Which of the following statements is false? A.The concepts of icons, menus and windows were originally developed by Xerox PARC.

B.Windows is an open source operating system. C.The software that contains the core components of the operating system is called the kernel. D.Linux source code is available to the public for examination and modification.
Computers and Technology
1 answer:
Fudgin [204]3 years ago
8 0

Answer:

(b) Windows is an open source operating system (<em>This is not correct</em>)

Explanation:

Option a is <em>correct</em> because Xerox PARC(Palo Alto Research Center), which is a subsidiary of the Xerox corporation, has been greatly responsible for invention and development in modern computing devices. Some of these developments are in Ethernet and graphical user interface (making use of menus, icons e.t.c).

Option b is <em>not correct</em> because Windows Operating system is not an open source operating system. Open source OS means users can interact with the driving code of the OS and make modifications. Windows does not support this feature. Operating systems that are open source include Linux and OpenSolaris.

Option c is <em>correct</em>. An operating system has two main components - the kernel and the user interface. The core component of an operating system is the Kernel as it interacts directly with the hardware and manages system resources. The user interface on the other hand allows users to interact with the kernel of the operating system using texts and/or graphics as commands.

Option d is <em>correct</em>. Linux operating system is an open source OS. Therefore, the source code is made available to the public for examination and modification.

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Answer:

The following assumption will be made for this assignment;

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The program is written in Java and it uses comments to explain difficult lines. The program is as follows

import java.util.*;

public class Tests

{

public static void main(String [] args)

{

 //Declare variables

 Scanner input = new Scanner(System.in);

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 //Prompt user for name

 System.out.print("Enter Lastname: ");

 lastname = input.next();

 System.out.print("Enter Firstname: ");

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 char grade;

 //Declare Array

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 int total = 0;  

  //Decalare Average

  double   average;

 //Prompt user for scores

 for(int i =0;i<5;i++)

 {

  System.out.print("Enter Score "+(i+1)+": ");

  Scores[i] = input.nextInt();

  //Calculate Total Scores

  total+=Scores[i];

 }

 //Calculate Average

 average = total/5.0;

 //Get Letter Grade

 if(average>75)

 {

 grade = 'A';

 }

 else if(average>65)

 {

 grade = 'B';

 }

 else if(average>55)

 {

 grade = 'C';

 }

 else if(average>45)

 {

 grade = 'D';

 }

 else if(average>40)

 {

 grade = 'E';

 }

 else

 {

 grade = 'F';

 }

 //Print Student Results

 System.out.print("Fullname: "+lastname+", "+firstname);

 System.out.print('\n');

 System.out.print("Total Scores: "+total);

 System.out.print('\n');

 System.out.print("Average Scores: "+average);

 System.out.print('\n');

 System.out.print("Grade: "+grade);

}

}

See Attachment for .java file

Download java
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Given that an integer variable i and a floating-point variable f have already been declared and given values: Write a statement
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Answer:

Follows are the given statement to this question:

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Explanation:

The full code to the given question:

code:

#include <stdio.h>//defining header file

int main()// main method

{

   int i;//declaring integer variable

   float f;//declaring float variable

   i=25; //assign integer value

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   printf("i=%d f=%f", i, f);//print value

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   return 0;

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Output:

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In the above-given code, the two variable "i and f" is declared, that holds integer and floating-point value in its respective variable and use the print method, to print "i and f" variables value.  

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