Question

In: Computer Science

write the algorithm for this the code?!. #include<iostream> using namespace std; #include<string.h> int main() { char...

write the algorithm for this the code?!.

#include<iostream>

using namespace std;

#include<string.h>

int main()

{

char plain[50], cipher[50]="", decrypt[50]="";

int subkeys[50], len;

cout<<"Enter the plain text:"<<endl;

cin>>plain;

cout<<"Enter the first subkey:"<<endl;

cin>>subkeys[0];

_strupr(plain);

len = strlen(plain);

/**********Find the subkeys**************/

for(int i=1; i<len; i++)

{

if ((plain[i-1]>='A') && (plain[i-1]<='Z'))

{

subkeys[i] = plain[i-1]-65;

}

/****************ENCRYPTION***************/

for(int i=0; i<len; i++)

{

if ((plain[i]>='A') && (plain[i]<='Z'))

{

cipher[i] = (((plain[i]-65)+subkeys[i])%26)+65;

}

cout<<"The cipher text is:\t"<<cipher<<endl;

/****************DECRYPTION***************/

for(int i=0; i<len; i++)

{

if ((cipher[i]>='A') && (cipher[i]<='Z'))

{

decrypt[i] = ((cipher[i]-65)-subkeys[i])%26;

if (decrypt[i]<0) decrypt[i] += 26; //(if negative number, add 26 to decrypt[i]

decrypt[i] += 65; // from number to ascii

}

cout<<"The decrypted text is:"<<"\t"<<decrypt<<endl;

}

Expert Solution

If any quries about answer please leave a comment..........

Please give positive rating.........

Thank you........

venereology answered 1 year ago

I want Algorithim of this c++ code #include<iostream> using namespace std; int main() { char repeat...

I want Algorithim of this c++ code #include<iostream> using namespace std; int main() { char repeat = 'y'; for (;repeat == 'y';){ char emplyeename[35]; float basic_Salary,EPF, Dearness_Allow, tax, Net_Salary , emplyee_id; cout << "Enter Basic Salary : "; cin >> basic_Salary; Dearness_Allow = 0.40 * basic_Salary; switch (01) {case 1: if (basic_Salary <= 2,20,00) EPF = 0; case 2: if (basic_Salary > 28000 && basic_Salary <= 60000) EPF = 0.08*basic_Salary; case 3: if (basic_Salary > 60000 && basic_Salary <= 200000)...

complete the program #include <cstdlib> #include <iostream> #include <iomanip> using namespace std; int main(int argc, char**...

complete the program #include <cstdlib> #include <iostream> #include <iomanip> using namespace std; int main(int argc, char** argv) { int number, sum, count; // Write a while loop that reads a number from the user and loop // until the number is divisible by 7 cout << "What is the number? "; cin >> number; while ( ... ) { ... } cout << number << " is divisible by 7!! << endl << endl; // Write a for loop that...

What would the following program output? #include <iostream> using namespace std; int main() { char alpha...

What would the following program output? #include <iostream> using namespace std; int main() { char alpha = 'A'; for(int i = 0; i < 13; i++){ for(int j = 0; j < 2; j++){ cout << alpha; alpha++; } } cout << endl; return 0; }

C++ Given Code: #include <iostream> #include <string> using namespace std; int main() { //declare variables to...

C++ Given Code: #include <iostream> #include <string> using namespace std; int main() { //declare variables to store user input bool cont = true; //implement a loop so that it will continue asking until the user provides a positive integer // the following provides ONLY part of the loop body, which you should complete { cout <<"How many words are in your message? \n"; cout <<"Enter value: "; // get user input integer here cout <<"\nInvalid value. Please Re-enter a...

#include <iostream> using namespace std; int main() { int hour; int min; for (hour = 1;...

#include <iostream> using namespace std; int main() { int hour; int min; for (hour = 1; hour <= 12; hour++) { for (min = 0; min <= 59; min++) { cout << hour << ":" << min << "AM" << endl; } } return 0; } 1. Type in the above program as time.cpp. Add a comment to include your name and date. Compile and run. 2. What is the bug or logic error in the above program? Add the...

#include <iostream> #include <iomanip> using namespace std; int main() { int studentid, numberreverse[20], count =...

#include <iostream> #include <iomanip> using namespace std; int main() { int studentid, numberreverse[20], count = 0, maximum = 0, minimum = 0; cout << "Enter your student ID number: "; cin >> studentid; cout << "Student ID Number = " << studentid << endl; while (studentid != 0) { numberreverse[count] = studentid % 10; if (count == 0) { minimum = numberreverse[count]; maximum = minimum; } else...

C++ I took 7/20 =( code: #include <iostream> #include<string.h> using namespace std; // function to calculate...

C++ I took 7/20 =( code: #include <iostream> #include<string.h> using namespace std; // function to calculate number non white space characters int GetNumOfNonWSCharacters(string str) { int i = 0; int count = 0; while(str[i] != '\0') { if(str[i] != ' ') { count += 1; } i++; } return count; } // function to calculate numbers of words int GetNumOfWords(string str) { int i = 0; int count = 1; while(str[i] != '\0') { if(str[i] == ' ' && str[i-1]...

#include <iostream> #include <string> #include <fstream> #include <vector> #include <sstream> using namespace std; int main() {...

#include <iostream> #include <string> #include <fstream> #include <vector> #include <sstream> using namespace std; int main() { ifstream infile("worldpop.txt"); vector<pair<string, int>> population_directory; string line; while(getline(infile, line)){ if(line.size()>0){ stringstream ss(line); string country; int population; ss>>country; ss>>population; population_directory.push_back(make_pair(country, population)); } } cout<<"Task 1"<<endl; cout<<"Names of countries with population>=1000,000,000"<<endl; for(int i=0;i<population_directory.size();i++){ if(population_directory[i].second>=1000000000){ cout<<population_directory[i].first<<endl; } } cout<<"Names of countries with population<=1000,000"<<endl; for(int i=0;i<population_directory.size();i++){ if(population_directory[i].second<=1000000){ cout<<population_directory[i].first<<endl; } } } can u pls explain the logic behind this code up to 10 lines pls， many thanks

How do i make this program accept strings? #include <iostream> #include <algorithm> using namespace std; int...

How do i make this program accept strings? #include <iostream> #include <algorithm> using namespace std; int binaryToOctal(char digits[], int a) { int number; if (digits[0] == '0') { if (digits[1] == '1') if (digits[2] == '0') return 2; //found "010" else return 3; //found "011" else if (digits[1] == '0') if (digits[2] == '1') return 1; // found "001" else return 0; //found "000" } else { if (digits[0] == '1') if (digits[1] == '1') if (digits[2] == '0') return...

Complete the following program #include<iostream> #include<iomanip> #include<fstream> using namespace std; int main() { // I -...

Complete the following program #include<iostream> #include<iomanip> #include<fstream> using namespace std; int main() { // I - Declaring a five by five array /* II - Read data from data.txt and use them to create the matrix in the previous step*/ // III - Count and print the number of even integers in the matrix. /* IV - Calculate and print the sum of all integers in the columns with an even index value. Please note the column index begins...