History timeline: who developed what elements first Windows OS and Apple OS?

2 answers:

7 0

Windows was originally just a Graphical user extension to Microsoft existing product MS-DOS. Most operating system under the windows brand had been based on the MS-DOS architecture (apart from NT). Windows XP had been the first home consumer operating system to be shipped to customers that had been based on the NT version of windows. To this day, windows is still based upon the NT architecture.

Apple’s operating systems are built upon NeXTSTEP that was created by Steve Jobs during his absence from Apple. Upon Steve Job’s return to Apple, NeXTSTEP had been bought by apple and the NeXTSTEP operating system laid the foundations for all of Apple’s operating systems (macOS, iOS, watchOS and tvOS).

Harrizon [31]3 years ago

5 0

Answer:

i think bill gates

Explanation:

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anygoal [31]

True, this is a true statement.

7 0

3 years ago

Write the definition of a method named countPos that receives a reference to a Scanner object associated with a stream of input

NNADVOKAT [17]

Answer:

Here is the method countPos

static int countPos(Scanner input){ //method that takes a reference to a Scanner object

int counter=0; // to count the positive integers

int number; //to store each integer value

if(input.hasNextInt()){ //checks if next token in this scanner input is an integer value

number=input.nextInt(); //nextInt() method of a Scanner object reads in a string of digits and converts them into an int type and stores it into number variable

counter=countPos(input); //calls method by passing the Scanner object and stores it in counter variable

if(number>0) //if the value is a positive number

counter++; } //adds 1 to the counter variable each time a positive input value is enountered

else { //if value is not a positive integer

return counter; } //returns the value of counter

return counter; } //returns the total count of the positive numbers

Explanation:

Here is the complete program:

import java.util.Scanner; //to take input from user

public class Main { //class name

//comments with each line of method below are given in Answer section

static int countPos(Scanner input){

int counter=0;

int number;

if(input.hasNextInt()){

number=input.nextInt();

counter=countPos(input);

if(number>0)

counter++; }

else {

return counter; }

public static void main(String[] args) { //start of main function

System.out.println("Number of positive integers: " + countPos(new Scanner(System.in))); } } //prints the number of positive integers by calling countPos method and passing Scanner object to it

The program uses hasNextInt method that returns the next token (next input value) and if condition checks using this method if the input value is an integer. nextInt() keeps scanning the next token of the input as an integer. If the input number is a positive number then the counter variable is incremented to 1 otherwise not. If the use enters anything other than an integer value then the program stops and returns the total number of positive integers input by the user. This technique is used in order to avoid using any loop. The program and its output is attached