[C++] JiMP2 lab2 lamanie szyfru

#include <iostream>
#include <fstream>
#include <conio.h>


using namespace std;


struct NumberList
{
    int number;
    NumberList *next;
};

void addToList(NumberList **headPointer, int num)
{
    NumberList *pointer;

    pointer = *headPointer;
    if (pointer == NULL)
    {
        pointer = new NumberList;
        pointer->number = num;
        pointer->next = NULL;
        *headPointer = pointer;
    }
    else
    {
        while(pointer->next != NULL)
        {
            pointer = pointer->next;
        }
        pointer->next = new NumberList;
        pointer = pointer->next;
        pointer->number = num;
        pointer->next = NULL;
    }
}

int main()
{
    ifstream myfile("cipher.txt");
    string cipher;

    if(!myfile)
        cout << "Nie można otworzyć pliku!" << endl;
    else
    {
        int stringLength, encryptedNumber;

        myfile >> cipher;
        NumberList *head;
        head = NULL;

        stringLength = cipher.length();

        encryptedNumber = 0;
        for (int i = 0; i < stringLength; i++)
        {
            if (cipher[i] != ',')
            {
                encryptedNumber = encryptedNumber*10 + cipher[i] - 48;
            }
            else
            {
                addToList(&head, encryptedNumber);
                encryptedNumber = 0;
            }

        }
        addToList(&head, encryptedNumber);

        NumberList *pointer;

        int decryptedSum = 0;

        for (int i = 103; i < 104; i++)
        {
            for (int j = 111; j < 112; j++)
            {
                for (int k = 100; k < 101; k++) // 97-122
                {
                    int letterSwitch = 0;
                    int key, decrypted;

                    pointer = head;

                    while(pointer != NULL)
                    {
                        switch(letterSwitch)
                        {
                        case 0:
                            key = i;
                            break;
                        case 1:
                            key = j;
                            break;
                        case 2:
                            key = k;
                            break;
                        }
                        decrypted = pointer->number ^ key;
                        decryptedSum += decrypted;
                        cout << (char)decrypted;
                        letterSwitch++;
                        letterSwitch %= 3;
                        pointer = pointer->next;
                    }
                    cout << endl;
                }
            }
        }
        cout << endl << endl << endl;
        cout << "Suma kodow ASCII rozszyfrowanych liter: " << decryptedSum;
    }

    myfile.close();

    getch();

    return 0;
}