Оцените шифратор цезаря

#include <iostream>
#include <string>

using namespace std;

string encrypt(string text, int shift)
{
string result = "";
for (int i = 0; i < text.length(); i++) {
if (isalpha(text[i])) {
char c = text[i];
if (isupper(c)) {
result += char(int(c + shift - 65) % 26 + 65);
}
else {
result += char(int(c + shift - 97) % 26 + 97);
}
}
else {
result += text[i];
}
}
return result;
}

string decrypt(string text, int shift)
{
string result = "";
for (int i = 0; i < text.length(); i++) {
if (isalpha(text[i])) {
char c = text[i];
if (isupper(c)) {
result += char(int(c - shift - 65 + 26) % 26 + 65);
}
else {
result += char(int(c - shift - 97 + 26) % 26 + 97);
}
}
else {
result += text[i];
}
}
return result;
}

int main()
{
int action, shift, num_letters;
string text;

cout << "Choose an action (1 for encryption, 2 for decryption): ";
cin >> action;

if (action == 1) {
cout << "Enter the number of letters to shift: ";
cin >> shift;
cin.ignore();

cout << "Enter the text to encrypt: ";
getline(cin, text);

string encrypted_text = encrypt(text, shift);
cout << "Encrypted text: " << encrypted_text << endl;
}
else if (action == 2) {
cout << "Enter the number of letters before the words: ";
cin >> num_letters;
cin.ignore();

cout << "Enter the text to decrypt: ";
getline(cin, text);

string decrypted_text = decrypt(text, num_letters);
cout << "Decrypted text: " << decrypted_text << endl;
}
else {
cout << "Invalid action chosen. Please choose 1 for encryption or 2 for decryption." << endl;
}

return 0;
}

Код

#include <iostream>

#include <string>



using namespace std;



string encrypt(string text, int shift)

{

    string result = "";

    for (int i = 0; i < text.length(); i++) {

        if (isalpha(text[i])) {

            char c = text[i];

            if (isupper(c)) {

                result += char(int(c + shift - 65) % 26 + 65);

            }

            else {

                result += char(int(c + shift - 97) % 26 + 97);

            }

        }

        else {

            result += text[i];

        }

    }

    return result;

}



string decrypt(string text, int shift)

{

    string result = "";

    for (int i = 0; i < text.length(); i++) {

        if (isalpha(text[i])) {

            char c = text[i];

            if (isupper(c)) {

                result += char(int(c - shift - 65 + 26) % 26 + 65);

            }

            else {

                result += char(int(c - shift - 97 + 26) % 26 + 97);

            }

        }

        else {

            result += text[i];

        }

    }

    return result;

}



int main()

{

    int action, shift, num_letters;

    string text;



    cout << "Choose an action (1 for encryption, 2 for decryption): ";

    cin >> action;



    if (action == 1) {

        cout << "Enter the number of letters to shift: ";

        cin >> shift;

        cin.ignore();



        cout << "Enter the text to encrypt: ";

        getline(cin, text);



        string encrypted_text = encrypt(text, shift);

        cout << "Encrypted text: " << encrypted_text << endl;

    }

    else if (action == 2) {

        cout << "Enter the number of letters before the words: ";

        cin >> num_letters;

        cin.ignore();



        cout << "Enter the text to decrypt: ";

        getline(cin, text);



        string decrypted_text = decrypt(text, num_letters);

        cout << "Decrypted text: " << decrypted_text << endl;

    }

    else {

        cout << "Invalid action chosen. Please choose 1 for encryption or 2 for decryption." << endl;

    }



    return 0;

}