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Help with C++ opening and reading file

spanky 10 (3)
I've included the code I have written but I am stuck. I created a text file but I'm not sure where to save it to have it open when I input the name. Also, I need to include in the encrypt function that it is writing the encrypted message to a text file called output.txt and I'm not sure how to do that.

Any help would be greatly appreciated! Thanks

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#include <iostream>
#include <fstream>
#include <string>
using namespace std;

void encrypt ()
{
    string fileName;
    string message;
    cout <<"Enter the file name containing the message you would like to encrypt: ";
    cin >> fileName;
    ifstream inFile;
    inFile.open(fileName);
    getline(inFile, message);
    
    for (int x=0; x<message.length(); x++)
    {
        if (message[x] == 'A' || message[x] == 'a')
            message[x] = 'B';
        else if (message[x] == 'B' || message[x] == 'b')
            message[x] = 'C';
        else if (message[x] == 'C' || message[x] == 'c')
            message[x] = 'D';
        else if (message[x] == 'D' || message[x] == 'd')
            message[x] = 'E';
        else if (message[x] == 'E' || message[x] == 'e')
            message[x] = 'F';
        else if (message[x] == 'F' || message[x] == 'f')
            message[x] = 'G';
        else if (message[x] == 'G' || message[x] == 'g')
            message[x] = 'H';
        else if (message[x] == 'H' || message[x] == 'h')
            message[x] = 'I';
        else if (message[x] == 'I' || message[x] == 'i')
            message[x] = 'J';
        else if (message[x] == 'J' || message[x] == 'j')
            message[x] = 'K';
        else if (message[x] == 'K' || message[x] == 'k')
            message[x] = 'L';
        else if (message[x] == 'L' || message[x] == 'l')
            message[x] = 'M';
        else if (message[x] == 'M' || message[x] == 'm')
            message[x] = 'N';
        else if (message[x] == 'N' || message[x] == 'n')
            message[x] = 'O';
        else if (message[x] == 'O' || message[x] == 'o')
            message[x] = 'P';
        else if (message[x] == 'P' || message[x] == 'p')
            message[x] = 'Q';
        else if (message[x] == 'Q' || message[x] == 'q')
            message[x] = 'R';
        else if (message[x] == 'R' || message[x] == 'r')
            message[x] = 'S';
        else if (message[x] == 'S' || message[x] == 's')
            message[x] = 'T';
        else if (message[x] == 'T' || message[x] == 't')
            message[x] = 'U';
        else if (message[x] == 'U' || message[x] == 'u')
            message[x] = 'V';
        else if (message[x] == 'V' || message[x] == 'v')
            message[x] = 'W';
        else if (message[x] == 'W' || message[x] == 'w')
            message[x] = 'X';
        else if (message[x] == 'X' || message[x] == 'x')
            message[x] = 'Y';
        else if (message[x] == 'Y' || message[x] == 'y')
            message[x] = 'Z';
        else if (message[x] == 'Z' || message[x] == 'z')
            message[x] = 'A';
        
        inFile.close();
    }
    cout <<"The encrypted message is: \n" << message;
}

void decrypt ()
{
    string fileName;
    string message;
    cout <<"Enter the file name containing the message you would like to encrypt: ";
    cin >> fileName;
    ifstream inFile;
    inFile.open(fileName);
    getline(inFile, message);
    
    for (int x = 0; x < message.length (); x++)
         {
             if (message[x] == 'A' || message[x] == 'a')
                 message[x] = 'Z';
             else if (message[x] == 'B' || message[x] == 'b')
                 message[x] = 'A';
             else if (message[x] == 'C' || message[x] == 'c')
                 message[x] = 'B';
             else if (message[x] == 'D' || message[x] == 'd')
                 message[x] = 'C';
             else if (message[x] == 'E' || message[x] == 'e')
                 message[x] = 'D';
             else if (message[x] == 'F' || message[x] == 'f')
                 message[x] = 'E';
             else if (message[x] == 'G' || message[x] == 'g')
                 message[x] = 'F';
             else if (message[x] == 'H' || message[x] == 'h')
                 message[x] = 'G';
             else if (message[x] == 'I' || message[x] == 'i')
                 message[x] = 'H';
             else if (message[x] == 'J' || message[x] == 'j')
                 message[x] = 'I';
             else if (message[x] == 'K' || message[x] == 'k')
                 message[x] = 'J';
             else if (message[x] == 'L' || message[x] == 'l')
                 message[x] = 'K';
             else if (message[x] == 'M' || message[x] == 'm')
                 message[x] = 'L';
             else if (message[x] == 'N' || message[x] == 'n')
                 message[x] = 'M';
             else if (message[x] == 'O' || message[x] == 'o')
                 message[x] = 'N';
             else if (message[x] == 'P' || message[x] == 'p')
                 message[x] = 'O';
             else if (message[x] == 'Q' || message[x] == 'q')
                 message[x] = 'P';
             else if (message[x] == 'R' || message[x] == 'r')
                 message[x] = 'Q';
             else if (message[x] == 'S' || message[x] == 's')
                 message[x] = 'R';
             else if (message[x] == 'T' || message[x] == 't')
                 message[x] = 'S';
             else if (message[x] == 'U' || message[x] == 'u')
                 message[x] = 'T';
             else if (message[x] == 'V' || message[x] == 'v')
                 message[x] = 'U';
             else if (message[x] == 'W' || message[x] == 'w')
                 message[x] = 'V';
             else if (message[x] == 'X' || message[x] == 'x')
                 message[x] = 'W';
             else if (message[x] == 'Y' || message[x] == 'y')
                 message[x] = 'X';
             else if (message[x] == 'Z' || message[x] == 'z')
                 message[x] = 'Y';
         }
    
    cout << "The decrypted message is: \n" << message;
    
}

void display_menu ()
{
    int num;
    cout <<"Welcome to the Engima Program!";
    cout <<"Which of the following would you like to do? <Enter the Number>:" <<endl<<"\t1. Create an encrypted message"<<endl<<"\t2. Decrypt a message" <<endl<<"\t3. Quit"<<endl<<endl;
    cin >>num;
    if (num ==1)
    {
        encrypt();
    }
    else if (num ==2)
    {
        decrypt();
    }
    else
    {
        cout << "Goodbye";
    }
}


int main()
{
    display_menu();
    
    return 0;
}

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