lab1

#include <iostream>

#include <string>

using namespace std;

string caesarEncrypt(string text, int shi ) {

string result = "";

for (char c : text) {

if (isalpha(c)) {

char base = isupper(c) ? 'A' : 'a';

result += (char)((c - base + shi ) % 26 + base);

} else {

result += c;

}

}

return result;

}

string caesarDecrypt(string text, int shi ) {

return caesarEncrypt(text, 26 - (shi % 26));

}

int main() {

string inputText;

int shi ;

int choice;

string encrypted, decrypted;

cout << "=== Caesar Cipher ===\n";

cout << "Enter the text: ";

getline(cin, inputText);

cout << "Enter the shi value: ";

cin >> shi ;

encrypted = caesarEncrypt(inputText, shi );

cout << "Encrypted Text: " << encrypted << endl;

decrypted = caesarDecrypt(encrypted, shi );

cout << "Decrypted Text: " << decrypted << endl;

return 0;

}