sgdb Vector

This is Frank's self-exam answer related to programming exam #1. There are a few different ways to represent the student database. In the following solution, I am using vector to store the DB. Two classes are created: one is the student, the other is the studentDB.

The main.cpp pretty much is the direct reflection of DB's functions. I did not implement the sort, so no median.

int main()

{

studentGradeDB exam1;

exam1.load("frankDB.txt");

exam1.print();

cout << "avg = " << exam1.calculateAVG()<<endl;

exam1.save("test.txt");

exam1.print_rev();

exam1.save();

exam1.remove("Frank");

cout << "avg = " << exam1.calculateAVG()<<endl;

}

In student class, operator << and >> are overloaded such that one student object can be directly read/write from file or console streams.

ostream& operator<< (ostream& os, const studentGrade& sg)

{

os << sg.name << " " << sg.grade << endl;

return os;

}

istream& operator>> (istream& is, studentGrade& sg)

{

is >> sg.name >> sg.grade;

return is;

}

By the same token, we can choose to overload << and >> for studentDB. If that's the case, load and save function will be replaced. I did not go that route though.

studentDB.cpp is where most actions happening. Since it is a vector implementation, tracking of size, iterator, etc are handled by the STL. It is a relatively straightforward code.