Answer:
B) Keyloggers
Explanation:
Keyloggers are malicious softwares used by hackers to secretly record and capture keystrokes on a person's computer when they are using it. This enables the hackers steal sensitive data like passwords, bank details, address etc. Keyloggers are one of the oldest forms of cyber threats used by cybercriminals to spy on unsuspecting users. Keyloggers can be sent through links to access. computer o directly installed with access to the computer.
Answer:
Following are the code to the given question:
#include <iostream>//header file
using namespace std;
class Window //defining a class Window
{
private:
int width, height;//defining integer variable
public:
friend ostream& operator << (ostream& stm, Window& width)//defining a friend function that takes two parameters
{
return stm<<"a ("<<width.width<<" x "<<width.height<<") window"; //use return keyword that return its values
}
Window(int width, int height): width(width), height(height)//defining parameterized constructor that inherit width and height in its parameters
{}
};
int main() //Main method
{
Window w(80,90);//calling class constructor
cout<<w;//print object value
return 0;
}
Output:
a (80 x 90) window
Explanation:
In the above code, a class "Window" is defined that uses a friend function "ostream& operator" is declared that uses the "ostrea&" as a data type to hold two-variable "stm and w" in its parameter, and declared the parameterized constructor to hold value by inheriting width and height in its parameters.
Inside the main method, a class object is created that calls the constructor and uses the print method to print object value.
<h2>
Answer:</h2><h2>
============================================</h2>
//Class header definition
public class TestEven {
//Method main to test the method isEven
public static void main(String args[ ] ) {
//Test the method isEven using numbers 5 and 6 as arguments
System.out.println(isEven(5));
System.out.println(isEven(6));
}
//Method isEven
//Method has a return type of boolean since it returns true or false.
//Method has an int parameter
public static boolean isEven(int number){
//A number is even if its modulus with 2 gives zero
if (number % 2 == 0){
return true;
}
//Otherwise, the number is odd
return false;
}
}
====================================================
<h2>
Sample Output:</h2>
=========================================================
false
true
==========================================================
<h2>
Explanation:</h2>
The above code has been written in Java. It contains comments explaining every part of the code. Please go through the comments in the code.
A sample output has also been provided. You can save the code as TestEven.java and run it on your machine.
