Need help in using vector in class

[rithan]

dhuiwh djwqodj

[BlackSheep]

An actual question and a line number might help.

[rithan]

You are hired to develop a Final Year Project (FYP) management system for a university. The business rules are listed below:
· A student may register a project with a supervisor.
· A project may have up to 2 students and must have 1 supervisor only.

The system must be able to perform the following functions:
1. Create lecturers. [0.5m]
2. Delete lecturers. [1m]
3. Create students. [0.5m]
4. Delete students. [1m]
5. Create project. [0.5m]
6. Delete project. [1m]
7. Register a student to a supervisor for a project. [0.5m]
8. Register project according to the quota. [1m]
9. Unregister a student from a project. [1m]
10. List all lecturers (all attributes, student, and project must be shown) [1m]
11. List all students (all attributes, project, and supervisor must be shown) [1m]
12. List all projects (all attributes, student, and supervisor must be shown) [1m]
13. Read data from file and save data to file. [1m] (You may provide some initial data to facilitate testing during interview.)

Note that the correct way of doing Composition is the attribute itself must be a class. A example for composition is listed below:
class Project {
...
vector<Student*> students; // or "vector<Student> students;" or "Student students[2];",
// but not "vector<int> students;" nor "string students[2];"
Lecturer* supervisor;
...
};


You are strongly advised to complete the assignment with composition but without inheritance and polymorphism, then convert the program to incorporate inheritance and polymorphism.

[Script Coder]

So what is the problem?

[rithan]

Well my problem i need to use vector in class....As u can see my class is nt using vector at all....I need to noe how to change it... at least one example of above class should help me

[rithan]

y there is no reply?

[hanst99]

Because we don't do homework. Not that I mind helping, but you should at the very least be able to understand your task and identify the problem on your own.

[Script Coder]

y there is no reply?

Patience is a virtue, you are not the only person on this forum that needs helping, not does everyone get a magic message when YOU need help!

Now to your issue:
http://lmgtfy.com/?q=c%2B%2B+vector+tutorial

[Moschops]

Just for completeness, the original post was this monstrosity :)

class Lecturer
{
	protected:
	string lec_name;
	string lec_id;
	string lec_fac;

	public:
	Lecturer(string lec_name="", string lec_id="",string lec_fac="")
	{
		this->lec_name = lec_name;
		this->lec_id = lec_id;
		this->lec_fac = lec_fac;
	}
	string getLecName() {return lec_name;}
	string getLecId() {return lec_id;}
	string getLecFac() {return lec_fac;}

};

class Student
{
	protected:
	string stud_name;
	string stud_id;
	string stud_fac;

	public:
	Student(string stud_name="", string stud_id="",string stud_fac="")
	{
		this->stud_name = stud_name;
		this->stud_id = stud_id;
		this->stud_fac = stud_fac;
	}
	string getStudName() {return stud_name;}
	string getStudId() {return stud_id;}
	string getStudFac() {return stud_fac;}
};

class Project
{
	protected:
	string proj_name;
	string proj_id;

	public:
	Project(string proj_name="", string proj_id="")
	{
		this->proj_name = proj_name;
		this->proj_id = proj_id;
	}
	string getProjName() {return proj_name;}
	string getProjId() {return proj_id;}
};

vector <Lecturer> lecturer;
vector <Student> student;
vector <Project> project;
string temp1, temp2,temp3;
bool lec_exist=0, stud_exist=0, proj_exist=0, duplicate=0;
int position;

class Registration : public Lecturer, public Student, public Project
{
	public:
	Registration(string lec_name, string lec_fac,string lec_id,string stud_name, string stud_id,string stud_fac,string proj_name,string proj_id)
	: Lecturer(lec_name,lec_id,lec_fac), Student(stud_name,stud_id,stud_fac), Project(proj_name,proj_id) {}
};

vector <Registration> registration;

void Combine(string lecturer_name, string student_name, string project_name);
void ListAll(string input);
void ListOne(string input);
void Add(string input);
void Delete(string input);
void RegistrationFunction(string input);
void Check();
string Upper(string input);

void End()
{
	cout << endl << endl;
	system("pause");
}

void ShowMessage(int msgcode=0)
{
	if (msgcode == 0)
		cout << "\nNULL value is found";
	else if (msgcode == 1)
		cout << endl << "Lecturer " << temp1 << " cannot be found";
	else if (msgcode == 2)
		cout << endl << "Student" << temp2 << " cannot be found";
	else if (msgcode == 3)
		cout << endl << "Project " << temp3 << " cannot be found";
	else if (msgcode == 4)
		cout << endl << "Lecturer " << temp1 << " cannot be found";
	else if (msgcode == 5)
		cout << endl << temp1 << " has been added previously";
	else if (msgcode == 6)
		cout << endl << temp1 << " has registered " << temp2 << " previously";
	else if (msgcode == 7)
		cout << endl << temp1 << " has not register the subject " << temp2 << " previously";
	else if (msgcode == 96)
		cout << endl << temp1 << " has dropped " << temp2 << " successfully";
	else if (msgcode == 97)
		cout << endl << temp1 << " has registered " << temp2 << " successfully";
	else if (msgcode == 98)
		cout << endl << temp1 << " has been removed permanently";
	else if (msgcode == 99)
		cout << endl << temp1 << " has been registered under the faculty " << temp2 << " successfully";

	if (msgcode<50)
		system("color 04");
	else
		system("color 02");
}


void Combine(string x,string y,string z)
{
	int flag=0; string a,b,c,d,e,f,g,h;

	for(int i=0; i<lecturer.size();i++) // Fetch lecturer's faculty
	if(Upper(lecturer[i].getLecName())==Upper(x))
	{
		a = lecturer[i].getLecName();
		b = lecturer[i].getLecId();
		c = lecturer[i].getLecFac();
	}

	for(int i=0; i<student.size();i++) // Fetch student's faculty
	if(Upper(student[i].getStudName())==Upper(y))
	{
		d = student[i].getStudName();
		e = student[i].getStudId();
		f = student[i].getStudFac();
	}

	for(int i=0; i<project.size();i++) // Fetch project's faculty
	if(Upper(project[i].getProjName())==Upper(z))
	{
		g = project[i].getProjName();
		h = project[i].getProjId();
	}

	Registration temp(a,b,c,d,e,f,g,h); // Confirm registration
	registration.push_back(temp);
}


void ListAll(string x)
{
	system("cls");
	vector<Registration>temp = registration;

	if(x=="Lecturers")
		cout << "All lecturers\n\nNo.\tLecturers\tID\t\tFaculty\t\tStudent\t\tProject\n";
	else if(x=="Student")
		cout << "All students\n\nNo.\tStudents\tID\tFaculty\t\tLecturer\t\tProject\n";
    else if(x=="Project")
		cout << "All project\n\nNo.\tProjects\tID\t\t\tLecturer\t\tStudent\n";


	for (int i=0; i<temp.size(); i++)
	{
		bool comma=0;
		if(temp[i].getLecName()=="" && x=="Lecturer") // Make sure lecturer is not empty
		{temp.erase(temp.begin()+i); i--;}
		else if(temp[i].getStudId()=="" && x=="Student") // Make sure lecturer is not empty
		{temp.erase(temp.begin()+i); i--;}
		else if(temp[i].getProjId()=="" && x=="Project") // Make sure lecturer is not empty
		{temp.erase(temp.begin()+i); i--;}
		else
		{
			if(x=="Lecturer") // Publish all students and projects
			{
				cout << i+1 << "\t" <<  temp[i].getLecName() << "\t\t" << temp[i].getLecId() << "\t\t" << temp[i].getLecFac() << "\t\t";

				for (int j=temp.size()-1; j>=0; j--)
				if(Upper(temp[j].getLecName())==Upper(temp[i].getLecName()) && temp[j].getStudName() != "" && temp[j].getProjName() != "")
				{
					if(comma)
					cout << ", ";
					cout << temp[j].getStudName();
					if(i!=j) {temp.erase(temp.begin()+j);}
					comma = 1;
				}
				cout << endl;
			}
			else if(x=="Student") // Publish all students
			{
				cout << i+1 << "\t" <<  temp[i].getStudName() << "\t\t" << temp[i].getStudId()<< "\t\t" << temp[i].getStudFac() << "\t\t";

				for (int j=temp.size()-1; j>=0; j--)
				if(Upper(temp[j].getStudName())==Upper(temp[i].getStudName()) && temp[j].getLecName() != "" && temp[j].getProjName() != "")
				{
					if(comma)
					cout << ", ";
					cout << temp[j].getLecName();
					if(i!=j) {temp.erase(temp.begin()+j);}
					comma = 1;
				}
				cout << endl;
			}
			else if(x=="Project") // Publish all students
			{
				cout << i+1 << "\t" <<  temp[i].getProjName() << "\t\t" << temp[i].getProjId() << "\t\t";

				for (int j=temp.size()-1; j>=0; j--)
				if(Upper(temp[j].getProjName())==Upper(temp[i].getProjName()) && temp[j].getLecName() != "" && temp[j].getStudName() != "")
				{
					if(comma)

					cout << ", ";
					cout << temp[j].getProjName();
					if(i!=j) {temp.erase(temp.begin()+j);}
					comma = 1;

				}
				cout << endl;
			}
		}
	}

	End();
}

void Add(string x)
{
	system("cls");

	if(x=="Lecturer")
		cout << "You are about to add a new lecturer\n\nLecturer Name\t: ";
	else if(x=="Student")
		cout << "You are about to add a new student\n\nSubject Name\t: ";
	else if(x=="Project")
		cout << "You are about to add a new project\n\nProject Name\t: ";
	getline(cin,temp1);
	cout << "ID\t: ";
	getline(cin,temp2);
	cout << "Faculty\t: ";
	getline(cin,temp3);

	Check();

	if(temp1=="" || temp2=="" || temp3=="")
		ShowMessage(0); // Display Message
	else if(lec_exist || stud_exist || proj_exist)
		ShowMessage(5); // Display Message
	else if(x=="Lecturer")
	{
		Lecturer temp(temp1, temp2,temp3);
		lecturer.push_back(temp);
		Combine(temp1,temp2,temp3);
		ShowMessage(99); // Display Message
	}
	else if(x=="Student")
	{
		Student temp(temp1,temp2,temp3);
		student.push_back(temp);
		Combine(temp1,temp2,temp3);
		ShowMessage(99);// Display Message
	}
    else if(x=="Project")
	{
		Project temp(temp1,temp2);
		project.push_back(temp);
		Combine(temp1,temp2,temp3);
		ShowMessage(99); // Display Message
	}
	End();
}

void Delete(string x)
{
	system("cls");
	bool flag=0;

	cout << "You are about to delete a " << x << "\n\n" << x << " Name\t: ";
	getline(cin,temp1);

	for (int i=0; i<registration.size(); i++)
	if ((Upper(registration[i].getLecName())==Upper(temp1) && x=="Lecturer") || (Upper(registration[i].getStudId())==Upper(temp1) && x=="Student"|| (Upper(registration[i].getProjId())==Upper(temp1) && x=="Project")))
	{
		registration.erase(registration.begin()+i);
		flag = 1;
		i--;
	}

	if(temp1=="")
		ShowMessage(0); // Display Message
	else if (flag == 1)
		ShowMessage(98); // Display Message
	else
		ShowMessage(1); // Display Message

	End();
}