advancedCompare Function

int advancedCompare(string q, int attributeNo, int pos)
{
    //Check if the element in that pos is a valid data
    if (STR1[pos].length() == 0)
    {
        return -1;
    }

    string a = "";
    string b = "";
    int w = 0;

    char o_DOB[3] = {'=', '=', '='};
    int i_DOB[3] = {0, 0, 0};
    int e_DOB[3] = {0, 0, 0};
    int temp_store_2 = 0;

    if (attributeNo >= 5 && !(isdigit(q[0])) && attributeNo != 6)
    {
        a = q.substr(0, 1);
        b = q.substr(1, 30);
        w = stoi(b);
    }
    else if (attributeNo >= 5 && isdigit(q[0]) && attributeNo != 6)
    {
        w = stoi(q);
    }
    else if (attributeNo == 6)
    {
        string temp_STR1 = "";
        string temp_STR2 = "";
        int met_slash = 0;

        if (isdigit(q[0]))
        {
            b = q.substr(0, 2);
            i_DOB[0] = stoi(b);
        }
        else
        {
            o_DOB[0] = q[0];
            b = q.substr(1, 2);
            i_DOB[0] = stoi(b);
        }

        int encounter_times = 0;
        for (int u = 0; u < q.length(); u++)
        {
            met_slash = 0;
            if (q[u] == '/')
            {
                //if encounter a space then set met_space to 1
                met_slash = 1;
                encounter_times++;
            }
            if (met_slash == 1)
            {
                if (isdigit(q[u + 1]) && encounter_times == 1)
                {
                    b = q.substr(u + 1, 2);
                    i_DOB[1] = stoi(b);
                }
                else if (!(isdigit(q[u + 1])) && encounter_times == 1)
                {
                    o_DOB[1] = q[u + 1];
                    b = q.substr(u + 2, 2);
                    i_DOB[1] = stoi(b);
                }
                else if (isdigit(q[u + 1]) && encounter_times == 2)
                {
                    b = q.substr(u + 1, 4);
                    i_DOB[2] = stoi(b);
                }
                else if (!(isdigit(q[u + 1])) && encounter_times == 2)
                {
                    o_DOB[2] = q[u + 1];
                    b = q.substr(u + 2, 4);
                    i_DOB[2] = stoi(b);
                }
            }
        }
    }

    int compareResult = 0;

    switch (attributeNo)
    {
    //name
    case 0:
        compareResult = STR1[pos].find(q);
        break;
    //country
    case 1:
        compareResult = STR2[pos].find(q);
        break;
    //designation
    case 2:
        compareResult = STR3[pos].find(q);
        break;
    //gender
    case 3:
        if (STR4[pos].compare("female") == 0)
        {
            if (q.compare("female") == 0)
            {
                // cout << "is female" << endl;

                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (STR4[pos].compare("male") == 0)
        {
            if (q.compare("male") == 0)
            {
                // cout << "is male" << endl;
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        break;
    //level of education
    case 4:
        compareResult = STR5[pos].find(q);
        break;
    //ID
    case 5:

        if (a.find('>') == 0)
        {
            if (w < col1[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (a.find('<') == 0)
        {
            if (w > col1[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (w == col1[pos])
        {
            compareResult = pos;
        }
        else
        {
            compareResult = -1;
        }
        break;

    //DOB
    case 6:

        temp_store_2 = col2[pos];
        for (int d = 1000000; d <= 31000000; d += 1000000)
        {
            if (temp_store_2 >= d && temp_store_2 < (d + 1000000))
            {
                e_DOB[0] = (d / 1000000);
                temp_store_2 -= (d);
            }
        }
        for (int m = 10000; m <= 120000; m += 10000)
        {
            if (temp_store_2 >= m && temp_store_2 < (m + 10000))
            {
                e_DOB[1] = (m / 10000);
                temp_store_2 -= (m);
            }
        }
        for (int y = 0; y < 10000; y++)
        {
            if (temp_store_2 == y)
            {
                e_DOB[2] = y;
            }
        }
        // cout << "I_DOB: " << o_DOB[0] << i_DOB[0] << "/" << o_DOB[1] << i_DOB[1] << "/" << o_DOB[2] << i_DOB[2] << endl;
        // cout << "E_DOB: " << e_DOB[0] << '/' << e_DOB[1] << '/' << e_DOB[2] << endl;
        if (i_DOB[0] >= 0 && i_DOB[1] >= 0 && i_DOB[2] >= 0)
        {
            char flags[3] = {'n', 'n', 'n'};
            for (int n = 0; n < 3; n++)
            {
                switch (o_DOB[n])
                {
                case '>':
                    if (e_DOB[n] > i_DOB[n])
                    {
                        flags[n] = 'y';
                    }
                    else
                    {
                        flags[n] = 'n';
                    }
                    break;
                case '<':
                    if (e_DOB[n] < i_DOB[n])
                    {
                        flags[n] = 'y';
                    }
                    else
                    {
                        flags[n] = 'n';
                    }
                    break;
                case '=':
                    if (e_DOB[n] == i_DOB[n])
                    {
                        flags[n] = 'y';
                    }
                    else
                    {
                        flags[n] = 'n';
                    }
                    break;
                }
            }
            if (flags[0] == 'y' && flags[1] == 'y' && flags[2] == 'y')
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else
        {
            compareResult = -1;
        }
        break;
    //Height
    case 7:

        if (a.find('>') == 0)
        {
            if (w < col3[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (a.find('<') == 0)
        {
            if (w > col3[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (w == col3[pos])
        {
            compareResult = pos;
        }
        else
        {
            compareResult = -1;
        }
        break;
    //Weight
    case 8:

        if (a.find('>') == 0)
        {
            if (w < col4[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (a.find('<') == 0)
        {
            if (w > col4[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (w == col4[pos])
        {
            compareResult = pos;
        }
        else
        {
            compareResult = -1;
        }
        break;
    //Years of working
    case 9:

        if (a.find('>') == 0)
        {
            if (w < col5[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (a.find('<') == 0)
        {
            if (w > col5[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (w == col5[pos])
        {
            compareResult = pos;
        }
        else
        {
            compareResult = -1;
        }
        break;
    //Basic Salary
    case 10:

        if (a.find('>') == 0)
        {
            if (w < col6[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (a.find('<') == 0)
        {
            if (w > col6[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (w == col6[pos])
        {
            compareResult = pos;
        }
        else
        {
            compareResult = -1;
        }
        break;
    //Allowances
    case 11:
        if (a.find('>') == 0)
        {
            if (w < col7[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (a.find('<') == 0)
        {
            if (w > col7[pos])
            {
                compareResult = pos;
            }
            else
            {
                compareResult = -1;
            }
        }
        else if (w == col7[pos])
        {
            compareResult = pos;
        }
        else
        {
            compareResult = -1;
        }
        break;
    }
    //cout << "Debug: Compare Result in Advanced Compare String: " << attributeNo << endl;
    if (compareResult == string::npos)
    {
        return -1;
    }
    else
    {
        return pos;
    }
}