reac

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

struct Node
{
    string letter;
    int data;
    Node *next;
};

void addInOrder(Node *&, char, int);
void deleteList(Node *&head);
void printList(Node * head);
int main()
{
    Node * head = nullptr;
    ifstream infile;
    string fileName;
    char fileLetter;
    int fileData = 0;

    //Welcome message
    cout << "\nWelcome to the Secret Messages program!\n";
    cout << "This program will decript the hidden message inside\n";
    cout << "a file and will show you what it says! Let's begin!\n";
    cout << endl;
    //Enter filename
    cout << "Enter filename: ";
    cin >> fileName;
    infile.open(fileName);
    if (infile)
    {
        while (infile >> fileLetter >> fileData)
        {
            addInOrder(head, fileLetter, fileData);
        }
    }
    else
    {
        cout << "Error file could not open...\n";
    }
    printList(head);
    //Goodbye message
    cout <<"\nThanks for using the Secret Messages program!\n";
}

void addInOrder(Node *&h, char fileLetter, int fileData)
{
    Node * curr;
    Node * prev;
    Node * newNode = new Node;
    newNode->letter = fileLetter;
    newNode->data = fileData;

    if (h == nullptr)
    {
        h = newNode;
        newNode->next = nullptr;
    }
    else
    {
        prev = nullptr;
        curr = h;
        while (curr != nullptr && curr->data < fileData)
        {
            prev = curr;
            curr = curr->next;
        }
        if (prev == nullptr)
        {
            h = newNode;
            newNode->next = curr;
        }
        else
        {
            prev->next = newNode;
            newNode->next = curr;
        }
    }
}
void deleteList(Node *&head)
{
    Node * curr;
    while (head != nullptr)
    {
        curr = head;
        head = head->next;
        delete curr;
    }
}

void printList(Node * h)
{
    Node * curr = h;
    while (curr != nullptr)
    {
        cout << curr->letter << " ";
        curr = curr->next;
    }
    cout << endl;
}