Untitled

#include<iostream>
using namespace std;

string encrypt(string msg, int key);
string decrypt(string msg, int key);

int main() {
    string msg;
    int key;

    cout << "Enter the message: ";
    cin >> msg;
    cout << "Enter key: ";
    cin >> key;

    string encrypted = encrypt(msg, key);
    cout << "Encrypted: " << encrypted << endl;

    string decrypted = decrypt(encrypted, key);
    cout << "Decrypted: " << decrypted << endl;

    return 0;
}

string encrypt(string msg, int key) {
    string encrypted = "";
    for (char ch : msg) {
        encrypted.push_back('a' + (ch - 'a' + key) % 26);
    }
    return encrypted;
}

string decrypt(string msg, int key) {
    string decrypted = "";
    for (char ch : msg) {
        decrypted.push_back('a' + (ch - 'a' - key + 26) % 26); // Add 26 to ensure positive modulo
    }
    return decrypted;
}