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3 years ago

Explain each kind of pointer and for what it is appropriate.

Computers and Technology

2 answers:

Gnoma [55]3 years ago

4 0

Answer:(1) Null pointer(2)huge pointer (3) far pointer (4)near pointer

Explanation:

(1)Null pointer: null pointer is a type of pointer that points at nothing

(2)Huge pointer: Just like a far pointer, it is use to point to the a whole resident of RAM

(4) Near pointer: It can only point to a smaller segment of RAM

(5) Generic pointer is a pointer used when you have more than one item of different type to choose

Mademuasel [1]3 years ago

3 0

Pointer: A pointer is a variable which holds the address of other variable of the specified data type(like int,float,char). In programming we basically use pointers to store the other variable's address.

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Brian wants to conduct an online search using a certain phrase he intends to use the word books that belong to the 1800's in his

Andrews [41]

Answer:

Use quotation marks (" ")

Explanation:

It depends on the search engine. For Google, you need to put the phrase inside of quotation (" ") marks. It also works for DogPile and Bing. I can't confirm whether it works with any other search engines, but I can confirm that it works with these three engines.

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3 years ago

Implement the RC4 stream cipher in C++. User should be able to enter any key that is 5 bytes to 32 bytes long. Be sure to discar

gladu [14]

Answer:

Explanation:

#include <iostream>

#include <string>

#include<vector>

using namespace std;

vector<int> permute(vector<int>, vector<int>);

string encrypt(vector<int>s1 , vector<int> t1, string p);

string decrypt(vector<int>s1, vector<int> t1, string p);

int main() {

string plaintext = "cryptology";

string plaintext2 = "RC4";

vector<int> S(256);

vector<int> T(256);

int key[] = { 1,2,3,6 };

int key2[] = { 5,7,8,9 };

int tmp = 0;

for (int i = 0; i < 256;i++) {

S[i] = i;

T[i] = key[( i % (sizeof(key)/sizeof(*key)) )];

}

S = permute(S, T);

for (int i = 0; i < 256 ;i++) {

cout << S[i] << " ";

if ((i + 1) % 16 == 0)

cout << endl;

}

cout << endl;

string p = encrypt(S, T, plaintext);

cout << "Message: " << plaintext << endl;

cout << "Encrypted Message: " << " " << p << endl;

cout << "Decrypted Message: " << decrypt(S, T, p) << endl << endl;

tmp = 0;

for (int i = 0; i < 256;i++) {

S[i] = i;

T[i] = key2[(i % (sizeof(key) / sizeof(*key)))];

}

S = permute(S, T);

for (int i = 0; i < 256;i++) {

cout << S[i] << " ";

if ((i + 1) % 16 == 0)

cout << endl;

}

cout << endl;

p = encrypt(S, T, plaintext2);

cout << "Message: " << plaintext2 << endl;

cout << "Encrypted Msg: " << p << endl;

cout << "Decrypted Msg: "<<decrypt(S, T, p) << endl << endl;

return 0;

}

string decrypt(vector<int>s1, vector<int> t1, string p) {

int i = 0;

int j = 0;

int tmp = 0;

int k = 0;

int b;

int c;

int * plain = new int[p.length()];

string plainT;

for (int r = 0; r < p.length(); r++) {

i = (i + 1) % 256;

j = (j + s1[i]) % 256;

b = s1[i];

s1[i] = s1[j];

s1[j] = b;

tmp = (s1[i] + s1[j]) % 256;

k = s1[tmp];

c = ((int)p[r] ^ k);

plain[r] = c;

plainT += (char)plain[r];

}

return plainT;

}

string encrypt(vector<int>s1, vector<int> t1, string p) {

int i = 0;

int j = 0;

int tmp = 0;

int k = 0;

int b;

int c;

int * cipher = new int [p.length()];

string cipherT;

cout << "Keys Generated for plaintext: ";

for (int r = 0; r < p.length(); r++) {

i = (i + 1) % 256;

j = (j + s1[i]) % 256;

b = s1[i];

s1[i] = s1[j];

s1[j] = b;

tmp = (s1[i] + s1[j]) % 256;

k = s1[tmp];

cout << k << " ";

c = ((int)p[r] ^ k);

cipher[r] = c;

cipherT += (char)cipher[r];

}

cout << endl;

return cipherT;

}

vector<int> permute(vector<int> s1, vector<int> t1) {

int j = 0;

int tmp;

for (int i = 0; i< 256; i++) {

j = (j + s1[i] + t1[i]) % 256;

tmp = s1[i];

s1[i] = s1[j];

s1[j] = tmp;

}

return s1;

}

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3 years ago

Which of the four control methods is best suited for transfer of large blocks of data?

mihalych1998 [28]

Answer:

Explanation:

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3 years ago

You have a folder on your Windows desktop system that you would like to share with members of your development team. Users need

horrorfan [7]

Answer:

modify the NTFS permissions on the folder

Explanation:

In order to solve this problem what you need to do is to modify the NTFS permissions on the folder. The NT File System permissions are security measures blocking access to manipulation of files within a directory and affects local users as well as network users. By adjusting the permissions of this within the folder that the members are trying to access then it will give them the ability to modify the files.

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3 years ago

What career cluster does a fish and game warden fall in?

Andrej [43]

The answer is Law, Public safety, Corrections & Security career cluster.

This cluster is organized into several career paths that include emergency and fire management, Law enforcement services, legal and correction services. Fish and Game Wardens main tasks include, investigate hunting accidents or reporting of fish or game law violations and preserve native wildlife and ecosystems.

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3 years ago