error 2679

*** update ***
now the code works but doesnt do exactly as it should. my vector jsut doesnt seem to exist properly.
any clues.



i give up. i cant seem to find the error in this code. i hate keeping up my program and asking ppl to find the error. but i dont think i know enough to find the error regarding the freakn overloaded= operator.
ok. taking a few deep breaths now.
any help would be appreciated. thank you



the error:
d:\Program Files\Microsoft Visual Studio .NET\Vc7\include\xutility(1237): error C2679: binary '=' : no operator found which takes a right-hand operand of type 'const StudentInfo' (or there is no acceptable conversion)

Code:

---

#include <iostream>
#include <iomanip>
#include <fstream>
#include <cctype>
#include <sstream>
#include <cstring>
#include <algorithm>
#include <vector>
#include <crtdbg.h>

using namespace std;

class StudentInfo;
class Class;

typedef vector <StudentInfo> StudentVect;

const unsigned NumLabGrades = 7;
const unsigned totalPossible = 300;
ostream &operator<< (ostream &, StudentInfo &);
Class & operator << (Class &, StudentInfo &);
bool operator< (const StudentInfo&, const StudentInfo&);

class Name
{
        char *first;
        char *last;
public:
        Name () { first = last = NULL; }
        void getFirstName (char *);
        void getLastName (char *);
        char * returnFirstName () const { return first; }
        char * returnLastName () const { return last; }
        ~Name () { delete [] first; delete [] last; }
};

void Name::getFirstName (char * temp)
{
        first = new char [strlen(temp) + 1];
        strcpy (first, temp);
}

void Name::getLastName (char * x)
{
        last = new char [strlen(x) + 1];
        strcpy (last, x);
}

class StudentInfo
{
        Name full_name;
        char ssn [10];
        unsigned lab_grades [7], midterm, final;
        unsigned loc;
        unsigned total_points;
        char final_grade;
        float percent;
public:
        StudentInfo () {
                loc = midterm = final = total_points = final_grade = 0;
                strcpy (ssn, "000000000");
                for (unsigned bah = 0; bah < NumLabGrades; bah++)
                        lab_grades [bah] = 0;
        }
        ~StudentInfo ();
        Name & full_name_accessor ();
        Name return_full_name ();
        void store_grades (unsigned, const int &);
        void getSSN (char *);
        void getMid (unsigned, const int &);
        void getFinal (unsigned x, const int &);
        bool checkLab (unsigned);
        bool checkAlpha (unsigned);
        void midterm_final_handler (unsigned &, char *);
        string IntToString(unsigned num);
        bool error_handler_101 (int, char *);
        bool error_handler_101 (int, unsigned &, char *);
        void calculateFinalGrade ();
        unsigned return_midterm ();
        char * return_ssn ();
        unsigned * return_lab_grades ();

        StudentInfo & operator= (const StudentInfo &);

        friend ostream & operator << (ostream &, StudentInfo &);
        friend Class & operator << (Class &, StudentInfo &);
        friend bool operator< (const StudentInfo& d1, const StudentInfo& d2);
};

Name & StudentInfo::full_name_accessor ()
{
        return full_name;
}

Name StudentInfo::return_full_name ()
{
        return full_name;
}

void StudentInfo::store_grades (unsigned x, const int & lin_num)
{
        if (!(checkLab (x))) {
                if (!(error_handler_101 (lin_num, x, "Lab")))
                        return;
        }
        lab_grades [loc] = x;
        loc++;
}

void StudentInfo::getMid (unsigned x, const int & line)
{
        if (!checkAlpha (x)) {
                if (!(error_handler_101 (line, x, "Midterm")))
                        return;
        }
        if ( x<0 || x>50 ) {
                cout << "Error with midterm score\n";
                midterm_final_handler (x, "midterm");
        }
        midterm = x;
}

void StudentInfo::midterm_final_handler (unsigned & x, char * msg)
{
        cout << "What would you like to do: ";
        cout << "\n[a]Abort Program\n[s]Skip (highly not recommended)\n[i]Input Score\n";
        cout << "Enter Option: ";
        char option;
        cin >> option;
        if (option == 's' || option == 'S') {
                return;
        }
        else if (option == 'i' || option == 'I') {
                unsigned temp;
                cout << "Please input the " << msg << " score: ";
                cin >> temp;
                if (checkAlpha (temp)) {
                        x = temp;
                        return;
                }
        }
        else {
                        cout << "Aborting Program.\nGoodbye\n";
                        exit (101);
                }
        return;
}
               
void StudentInfo::getFinal (unsigned x, const int & line)
{
        if (!checkAlpha (x)) {
                if (!(error_handler_101 (line, x, "Final")))
                        return;
        }
        if ( x<0 || x>100 ) {
                cerr << "Error with final score\n";
                midterm_final_handler (x, "final");
        }
        final = x;
}

bool StudentInfo::checkAlpha (unsigned x)
{
        string temp = IntToString (x);

        for (unsigned i = 0; i < temp.length (); i++)
        {
                if(!isdigit (temp[i])) return 0;
        }               
        return 1;
}

string StudentInfo::IntToString(unsigned num)
{
        ostringstream myStream; //creates an ostringstream object
        myStream << num << flush;
        return(myStream.str()); //returns the string form of the stringstream object
}

StudentInfo::~StudentInfo ()
{
//        Name *temp = &full_name;
//        delete [] temp;
}

void StudentInfo::getSSN (char * x)
{
        strcpy (ssn, x);
}

bool StudentInfo::checkLab (unsigned score)
{
        if (score < 0 || score > 25)
                return 0;
        return 1;
}

void StudentInfo::calculateFinalGrade (void)
{
        int smallest = 0;
        total_points = 0;

        for (int j = 0; j < 5; j++)
                if (lab_grades[j+1] < lab_grades [smallest])
                        smallest = j+1;

        for (int i = 0; i < 6; i++)
                if (i != smallest)
                        total_points += lab_grades[i];

        total_points += lab_grades [NumLabGrades - 1] + midterm + final;
        percent = ((float)total_points/(float)totalPossible) * 100;
       
        if (percent >= 90) final_grade = 'A';
        else if (percent >= 80)        final_grade = 'B';
        else if (percent >= 70)        final_grade = 'C';
        else if (percent >= 60)        final_grade = 'D';
        else final_grade = 'F';
cout << "foo calculategrade" << endl;
        return;
}

bool StudentInfo::error_handler_101 (int x, unsigned & score, char *check)
{
        if (check[0] == 'L')
                cout << "There is an error with lab score # " << loc+1 << " on line number " << x << endl;
        else
                cout << "There is an error with the " << check <<" score: " << score << " on line number " << x << endl;

        cout << "Choose Option:\n[a] Abort Program\n[s] Skip (not recommended)\n";
        cout << "Enter Option: ";
        char option = (char)cin.get ();

        if (option == 's' || option == 'S') {
                score = 0;
                return 1;
        }
        else { // if not S then just abort even if incorrect option
                cout << "Goodbye\n";
                exit (101);
        }
}

bool StudentInfo::error_handler_101 (int x, char * ssn)
{
        cout << "There is an error with the SSN# " << ssn << " on line number " << x << endl;
        cout << "Choose Option:\n[a] Abort Program\n[s] Skip SSN (not recommended)\n";
        cout << "Enter Option: ";
        char option = (char) cin.get ();
        if (option == 'a' || option == 'A') {
                cout << "Goodbye\n";
                exit (101);
        }
        else if (option == 's' || option == 'S') {
                getSSN ("000000000");
                return 1;
        }
        else ;
        cout << flush;
        return 0;
}

unsigned StudentInfo::return_midterm ()
{
        return midterm;
}

char * StudentInfo::return_ssn ()
{
        return ssn;
}

unsigned * StudentInfo::return_lab_grades ()
{
        return lab_grades;
}

StudentInfo & StudentInfo::operator= (const StudentInfo & vectAs)
{
        strcpy (ssn, vectAs.ssn);
        for (unsigned i = 0; i < NumLabGrades; i++)
        {
                lab_grades[i] = vectAs.lab_grades[i];
        }
        midterm = vectAs.midterm;
        final = vectAs.final;

        full_name.getFirstName (vectAs.full_name.returnFirstName ());
        full_name.getLastName (vectAs.full_name.returnLastName ());

        return *this;

}

class Class
{
        StudentVect ptr;
        unsigned size;
public:
        Class (unsigned x = 0);
        ~Class ();
        void getInput ();
        bool checkSSN (char x []);
        void print ();
        StudentVect return_ptr () { return ptr; }
        void sort_roll ();
        void printOut ();
        bool UDsort (StudentInfo, StudentInfo);

        static ifstream ifs;
        static ofstream ofs;

        friend ostream & operator << (ostream &, StudentInfo &);
        friend bool operator< (const StudentInfo&, const StudentInfo&);
        friend Class & operator << (Class &, StudentInfo &);
};

ifstream Class::ifs ("input.txt", ios::in | ios::binary);
ofstream Class::ofs ("output.txt", ios::out);

Class::Class (unsigned x) : size (x)
{
        StudentInfo defCon;
        for (unsigned foo = 0; foo < x; foo++)
        {
                ptr.push_back (defCon);
                cout << ptr[foo].return_ssn() << " ";
                for (int i = 0; i < 7; i++)
                        cout << ptr[foo].return_lab_grades()[i];
                cout << endl;
        }
       
}

void Class::getInput ()
{
        char temp[30], temp1[30], ssntemp [10], lab_grade [3], finalg [4];
        int line_num = 1;
        char check;
        StudentInfo vectAs;

        while (!Class::ifs.eof ()) {
                Class::ifs.getline (temp, sizeof (temp), ',');
                vectAs.full_name_accessor ().getFirstName (temp);

                Class::ifs.getline (temp1, sizeof (temp1), ',');
                vectAs.full_name_accessor ().getLastName (temp1);

                Class::ifs.getline (ssntemp, sizeof (ssntemp), ',');
                if (!checkSSN (ssntemp))
                        vectAs.error_handler_101 (line_num, ssntemp);
                else
                        vectAs.getSSN (ssntemp);

                for (unsigned i = 0; i < NumLabGrades; i++)
                {
                        if (Class::ifs.peek () == ',')
                        {
                                Class::ifs.ignore ();
                                vectAs.store_grades (0, line_num);
                        }
                        else
                        {
                                Class::ifs.getline (lab_grade, sizeof (lab_grade), ',');
                                vectAs.store_grades (atoi (lab_grade), line_num);
                        }
                }
                Class::ifs.getline (lab_grade, sizeof (lab_grade), ',');
                vectAs.getMid (atoi(lab_grade), line_num);

                Class::ifs.get (finalg, sizeof (finalg), ',');
                vectAs.getFinal (atoi (finalg), line_num);
               
                while ( check = (char) ifs.peek (), (check == (char)10 || check == (char)13))
                        ifs.ignore ();

//                ptr.push_back (vectAs);
                ptr[line_num-1] = vectAs;
        cout << ptr[line_num-1] << endl;
               
       
                line_num++;
        }
        ifs.clear ();
        ifs.close ();
        cout << "end of getInput" << endl;
}

bool Class::checkSSN (char x [])
{
        if (strlen (x) != 9)
                return 0;
        for (unsigned i = 0; i < (unsigned) strlen (x); i++)
                if (isdigit (x[i])) continue;
                else return 0;
        return 1;
}

void Class::print ()
{
        unsigned i;
        cout << setw (55) << "CIS27 Class Grades Report\n\n";
        cout << left << setw (22) << "Student Name";
        cout << right << "--- SSN ---  ---- Lab Grades ----  Mid  Fin  Pts  Perct  G\n";
        cout << setfill ('-') << setw (20) << "";
        cout << "  ";
        cout << setw (11) << "";
        cout << "  ";
        for (i = 0; i < 7; i++) cout << "-- ";
        cout << " ";
        for (i = 0; i < 3; i++) cout << "---  ";
        cout << "-----  -\n";
        cout << setfill (' ');

        for (i = 0; i < size; i++)
        {
                cout << (ptr[i]);
        }
}

void Class::printOut ()
{
        if (Class::ofs.fail ())
        {
                cerr << "Error creating output file\n.Did not create output file.\n";
                return;
        }
       
        Class foo;

        unsigned i;
        Class::ofs << setw (55) << "CIS27 Class Grades Report\n\n";
        Class::ofs << left << setw (22) << "Student Name";
        Class::ofs << right << "--- SSN ---  ---- Lab Grades ----  Mid  Fin  Pts  Perct  G\n";
        Class::ofs << setfill ('-') << setw (20) << "";
        Class::ofs << "  ";
        Class::ofs << setw (11) << "";
        Class::ofs << "  ";
        for (i = 0; i < 7; i++) Class::ofs << "-- ";
        Class::ofs << " ";
        for (i = 0; i < 3; i++) Class::ofs << "---  ";
        Class::ofs << "-----  -\n";
        Class::ofs << setfill (' ');

        for (i = 0; i < size; i++)
                foo << (ptr[i]);

        ofs.close ();
}


void Class::sort_roll ()
{
        sort (ptr.begin (),ptr.end ());
}

bool Class::UDsort (StudentInfo x, StudentInfo y)
{
        return strcmp (x.return_full_name().returnLastName (), y.return_full_name().returnLastName ()) < 0  ?  1 : 0;
}

Class & operator << (Class & temp, StudentInfo & x)
{
        unsigned i;
        unsigned ln = strlen (x.full_name_accessor ().returnLastName ());
        unsigned fn = strlen (x.full_name_accessor ().returnFirstName ());

        Class::ofs << x.full_name_accessor ().returnLastName () << ", ";
        if ((fn + ln) > 18)
        {
                for (i = 0; i < (18 - ln);i++)
                {
                        Class::ofs << (x.full_name_accessor ().returnFirstName ())[i];
                }
        }
        else
        {
                Class::ofs << x.full_name_accessor ().returnFirstName ();
                Class::ofs << setw (18-ln-fn) << "";
        }
        Class::ofs << setw (2) << "";
        Class::ofs.write (x.ssn, 3);
        Class::ofs << "-";
        for (i = 3; i < 5; i++) Class::ofs << x.ssn[i];
        Class::ofs << "-";
        for (; i < 9; i++) Class::ofs << x.ssn[i];
        Class::ofs << setw (2) << "";
        for (i = 0; i < NumLabGrades; i++) {
                Class::ofs << setw (2) << x.lab_grades [i] << " ";
        }
        Class::ofs << setw (2) << "" << x.midterm << "  " << setw (3) << right << x.final << "  ";
        Class::ofs << setw (3) << x.total_points << "  " << setprecision (1) << fixed << x.percent << "%  " << x.final_grade << endl;
        return temp;
}

ostream &operator<< (ostream &stream, StudentInfo & x)
{
        unsigned i;

        /* another option: char temp [21]; strncat (temp, lastname, strlen (lastname));
        strcat (temp, ", "); strncat (temp, firstname, (20 - strlen (lastname)); */

        unsigned ln = strlen (x.full_name_accessor ().returnLastName ());
        unsigned fn = strlen (x.full_name_accessor ().returnFirstName ());

        stream << x.full_name_accessor ().returnLastName () << ", ";
        if ((fn + ln) > 18)
        {
                for (i = 0; i < (18 - ln);i++)
                {
                        stream << (x.full_name_accessor ().returnFirstName ())[i];
                }
        }
        else
        {
                stream << x.full_name_accessor ().returnFirstName ();
                stream << setw (18-ln-fn) << "";
        }
        stream << setw (2) << "";
        stream.write (x.ssn, 3);
        stream << "-";
        for (i = 3; i < 5; i++) stream << x.ssn[i];
        stream << "-";
        for (; i < 9; i++) stream << x.ssn[i];
        stream << setw (2) << "";
        for (i = 0; i < NumLabGrades; i++) {
                stream << setw (2) << x.lab_grades [i] << " ";
        }
        stream << setw (2) << "" << x.midterm << "  " << setw (3) << right << x.final << "  ";
        stream << setw (3) << x.total_points << "  " << setprecision (1) << fixed << x.percent << "%  " << x.final_grade << endl;
        return stream;
}

Class::~Class ()
{
/*        for (unsigned i = 0; i < size; i++) delete ptr [i];
        delete [] ptr;
        */
}

bool open_file_and_check_length (ifstream & ifs, unsigned & size)
{
        char temp [257];
        ifs.open ("input.txt", ios::in | ios::binary);
                if (!ifs) {
                        cout << "Cannot open file\n";
                        return false;
                }
                else {
                        while (ifs) {
                                ifs.getline (temp, sizeof (temp));
                                size++;
                        }
                }
        size--;
        ifs.clear ();
        ifs.close ();
        return true;
}

bool operator< (const StudentInfo& d1, const StudentInfo& d2)
{
        return strcmp (d1.full_name.returnLastName (), d2.full_name.returnLastName ()) < 0 ? 0 : 1;
}

int main ()
{
        unsigned num_of_lines = 0;
        ifstream ifs;
       
        if (!open_file_and_check_length (ifs, num_of_lines)) return 0;

        Class cis27 (num_of_lines);
        cis27.getInput (); cout << "getInput done" << endl;
        for (unsigned i = 0; i < num_of_lines; i++)
                cis27.return_ptr ()[i].calculateFinalGrade (); cout << "i = " << i << endl;
        cis27.print (); cout << "print fn done" << endl;
        cis27.printOut (); cout << "printout fn done" << endl;

        return 0;
}}

---

i compiled the code on VC6.0 it did not return any error,but a warning

Cannot open input.txt file

ok i created an input.txt file and place abcd in it.

i run it again ,this time no error

but You have not provided input.txt and i cannot understand its format!

sorry my friend
http://www.mdofit.com/ide/27/lab9/input.txt

let me post the most updated code now.

it works now
no error
no warning

but the problem is that after it creates 3 elements in the vector, it seems to stop and crash

i have updated the code above. :)

it still has errors,
it is the output generated by code
----------------------------------
000000000 0000000
000000000 0000000
000000000 0000000
000000000 0000000
000000000 0000000
000000000 0000000
000000000 0000000
000000000 0000000
000000000 0000000
000000000 0000000
Doe, John 123-45-6789 20 21 22 23 16 19 16 50 75 0 -1073741
76.0%

Washington, Francisc 987-65-4321 20 21 22 23 16 19 16 30 70 0 -1073741
76.0%

Nguyen, Tom 111-11-1111 20 21 22 23 16 19 16 38 90 0 -1073741
76.0%

Press any key to continue
-------------------------------------------------------------------

Now it is displaying same grades for all students and same percentage??