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3 years ago

What are computer virus ? Explain in detail.In your answer include symptoms and prevention (3each)

Computers and Technology

1 answer:

Elenna [48]3 years ago

7 0

Answer:

Explanation:

A computer virus is a form of malicious software that piggybacks onto legitimate application code in order to spread and reproduce itself.

Like other types of malware, a virus is deployed by attackers to damage or take control of a computer. Its name comes from the method by which it infects its targets. A biological virus like HIV or the flu cannot reproduce on its own; it needs to hijack a cell to do that work for it, wreaking havoc on the infected organism in the process. Similarly, a computer virus isn't itself a standalone program. It's a code snippet that inserts itself into some other application. When that application runs, it executes the virus code, with results that range from the irritating to the disastrous.

Computer virus symptoms

How can you tell if a virus has slipped past your defenses? With some exceptions, like ransomware, viruses are not keen to alert you that they've compromised your computer. Just as a biological virus wants to keep its host alive so it can continue to use it as a vehicle to reproduce and spread, so too does a computer virus attempt to do its damage in the background while your computer still limps along. But there are ways to tell that you've been infected. Norton has a good list; symptoms include:

Unusually slow performance

Frequent crashes

Unknown or unfamiliar programs that start up when you turn on your computer

Mass emails being sent from your email account

Changes to your homepage or passwords

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Explanation:

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shusha [124]

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Explanation:

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3 years ago

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Initialize the list short_names with strings 'Gus', 'Bob', and 'Zoe'. Sample output for the given program:

ohaa [14]

Answer:

Following are the correct code to this question:

short_names=['Gus','Bob','Zoe']#defining a list short_names that holds string value

print (short_names[0])#print list first element value

print (short_names[1])#print list second element value

print (short_names[2])#print list third element value

Output:

Gus

Bob

Zoe

Explanation:

In the above python program code, a list "short_names" list is declared, that holds three variable that is "Gus, Bob, and Zoe".
In the next step, the print method is used that prints list element value.
In this program, we use the list, which is similar to an array, and both elements index value starting from the 0, that's why in this code we print "0,1, and 2" element value.

7 0

3 years ago

3-Write a Python program that has subprograms nested four deep and in which each nested subprogram references local variables, v

vivado [14]

Answer:

Explanation:

Below is a little explanation to guide us through;

There are 4 nested methods : level 0, level 1, level 2, and level 3.

Before the methods, there's a global variable defined that can be accessed by all the methods.

Level 0:

This method uses global variable, creates a level 0 variable in its scope, this level 0 variable can be used by all underlying nested methods.

Level 1: this method uses global, level 0, and level 1 variable, which can be accessed by all underlying nested methods: level 2, level 3.

Level 2: similar to te previous ones, it also uses global, level 0, level 1 variables. And creates a level 2 variable that can be accessed by level 3 also.

Level 3:

This method uses all previously created variables, and creates a new level 3 variable.

Function calls:

As you can see, the function calls are part of the method scopes. So, in order to call level 3, we need to access level 2 (because it is getting called from level 2 scope), for level 2, we must call level 1, for which level 0 needs to be called.

So, level 0 is called, which gives its out put and calls level 1, which gives its own output and calls level 2 and so on till level 3 is also called.

CODE:

global_var = "global" #accessible to all functions

def level0():

level0_var = "level 0" #accessible to level 0,1,2,3

print();

print("Level 0 function:")

print("global variable: ",global_var)

print("local variable 0: ",level0_var)

def level1():

print();

print("Level 1 function:")

level1_var = "level 1" ##accessible to level 1,2,3

print("global variable: ",global_var)

print("local variable 0: ",level0_var)

print("local variable 1: ",level1_var)

def level2():

print();

print("Level 2 function:")

level2_var = "level 2" #accessible to level 2,3

print("global variable: ",global_var)

print("local variable 0: ",level0_var)

print("local variable 1: ",level1_var)

print("local variable 2: ",level2_var)

def level3():

print();

print("Level 3 function:")

level3_var = "level 3" #accessible to level 3

print("global variable: ",global_var)

print("local variable 0: ",level0_var)

print("local variable 1: ",level1_var)

print("local variable 2: ",level2_var)

print("local variable 3: ",level3_var)

level3()

level2()

level1()

level0()

attached is the result of the code, also take note of the indentations too

cheers i hope this helps!!!!!

5 0

3 years ago

It is a well-researched fact that men in a restroom generally prefer to maximizetheir distance from already occupied stalls, by

Artyom0805 [142]

Answer:

The code below addresses the problem statement with appropriate comments for explanation.

Explanation:

public class Stall

{

public static void main(String[] args)

{

boolean[] arr = new boolean[10];

while(hasFreeSpots(arr)) // as long as there is a free slot

{

arr[position(arr)] = true;

// position(arr) gets the position of slot a person would most likely enter at(view problem statement)

// setting that position true(position occupied) by arr[position(arr)]

System.out.println(stallView(arr)); // printing current state of the stall using 'X' and '_'

}

/**

* Find the empty position that is in the middle of the sub-array of largest group of empty spots

* @param arr an array of boolean values

* @return returns an an integer value. Optimal position to be occupied.

public static int position(boolean[] arr)

{

int first = 0; // first stores the starting position of "longest sequence of unoccupied places"

int last = 0; // last stores the ending position of "longest sequence of unoccupied places"

int temp1 = 0; // temp1 stores the starting position of "current sequence of unoccupied places"

int temp2 = 0; // temp2 stores the ending position of "current sequence of unoccupied places"

for(int i = 0; i < arr.length; i++) // for each slot in the Stall

{

if(!arr[i]) // if slot i is not occupied

{

temp1 = i; // store starting position of "current sequence of unoccupied places" in temp1

while(i < arr.length && !arr[i] ) // if i is a valid index and as long as this slot is not occupied increment i

{

i++;

}

// we break out of the loop either if i is invalid index(reached end of the array)

// or if the slot is occupied by a person already

temp2 = i; // store ending position of "current sequence of unoccupied places" in temp2

if(Math.abs(first - last) < Math.abs(temp1 - temp2))

// if current sequence is longer than longest sequence, update it

{

first = temp1;

last = temp2;

}

return (first + last) / 2; // return middle index of first and last

}

/**

* Checks if there are empty spots in an array, basically checks if there is a false boolean value

* thats representing an empty spot in an array

* @param arr the input array, of boolean values

* @return returns a boolean value, true if there are false elements inside the array

public static boolean hasFreeSpots(boolean[] arr)

{

boolean rtn = true; // initializing rtn to 'true'

for(int i = 0; i < arr.length; i++) // for every slot in the Stall

{

if(!arr[i]){rtn = false;} // sets rtn to false if a free spot found

}

return !rtn; // returns true if a free spot found and returns false if no free spot found

}

/**

* X for true, _ for false. Representing occupied(X) and free stalls(_)

* @param arr a boolean array

* @return returns a string representation if the input

public static String stallView(boolean[] arr)

{

String str = ""; // initializing str to be an empty String

for(int i = 0; i < arr.length; i++) // for every slot in Stall

{

if(arr[i]){str += " X";} // Add X to str if slot is occupied

else {str += " _";} // prints _ to str if slot not occupied

}

return str; // return str(pictorial representation of Stall with 'X', '_')

}

7 0

3 years ago