The document outlines a C++ program named 'vigerene' that allows users to encrypt and decrypt messages using a secret code, following specific rules. It includes functions to encrypt and decrypt messages based on user input, handles both upper and lower case letters, and provides example output. The program prompts users for a message and secret code, then outputs the encrypted and decrypted messages.

1. i need help fixing my program so that the user can input both uper and lower case letters
Write a new C++ program named Vigerene.
use the rules of this website Code.org to return the message
Code.org (Links to an external site.)
Write the C++ program, Vigerene, which will prompt the user for a string message and a string
secret code. The code must be shorter than the message. Then write a function which takes the
message and code as parameters, and converts the two strings into a encrypted code using the
rules on the code.org website. Return the encrypted message and print it in the Main class.
Now write a new function which takes in an encrypted message and a secret code as two
parameters and decrypts the the message and returns it to Main for printing.
Here is sample output:
Enter your messge: my name is rick
Enter your secret code: helloworld
TBKYOHSQTVGVTNY
Enter your encrypted message
TBKYOHSQTVGVTNY
MY NAME IS RICK
code:
#include <iostream>
#include <string>
using namespace std;
string encrypt(string message, string code) {
string encrypted = "";
int j = 0;
for (int i = 0; i < message.length(); i++) {
char c = message[i];
if (isalpha(c)) {
int shift = code[j] - 'a';
char encrypted_char = (c + shift - 'a') % 26 + 'A';
encrypted += encrypted_char;
j = (j + 1) % code.length();
}
else {
encrypted += c;

2. }
}
return encrypted;
}
string decrypt(string message, string code) {
string decrypted = "";
int j = 0;
for (int i = 0; i < message.length(); i++) {
char c = message[i];
if (isalpha(c)) {
int shift = code[j] - 'a';
char decrypted_char = (c - shift - 'A' + 26) % 26 + 'A';
decrypted += decrypted_char;
j = (j + 1) % code.length();
}
else {
decrypted += c;
}
}
return decrypted;
}
int main() {
string message, code;
cout << "Enter your message: ";
getline(cin, message);
cout << "Enter your secret code: ";
getline(cin, code);
string encrypted = encrypt(message, code); // encrypt the message using the code
cout << "Encrypted message: " << encrypted << endl; // print the encrypted message
string decrypted = decrypt(encrypted, code); // decrypt the encrypted message using the code
cout << "Decrypted message: " << decrypted << endl; // print the decrypted message
cout << endl;
cout << "Enter your encrypted message: ";
getline(cin, encrypted);
decrypted = decrypt(encrypted, code);
cout << "Decrypted message: " << decrypted << endl;
return 0;
}