Move text cursor to new line - c++

Question

I have a text file, that looks like this:
Name_of_st1 67 5 87 4 78 4
Name_of_st2 89 5 56 3 79 4
...
I have written a program that reads the data and creates a vector of students with its own vector of subjects. The program reads the first line correctly, but when i ask it to write out name of second student, std::cout displays garbage. Here is the code:
struct Subject {
int mark0;
int mark1;
};
struct Student {
char name[50];
char surname[50];
vector<Subject>my_marks;
};
istream& operator>>(istream& is, Subject& sub);
istream& operator>>(istream& is, Student& st);
int main()
try
{
ifstream ifs("Text.txt");
vector<Student>group;
Student s1, s2;
ifs >> s1;
group.push_back(s1);
getline(ifs, temp);
ifs >> s2;
group.push_back(s2);
cout << group.size();
cout << group[0].name;
cout << group[0].surname;
cout << group[1].name;
cout << group[0].my_marks[1].mark0;
}
catch (exception& e){
cerr << e.what() << endl;
return 1;
}
catch (...)
{
cerr << "exception \n";
return 2;
}
istream& operator>>(istream& is, Subject& sub)
{
int m0, m1;
is >> m0;
if (!is) return is;
is>> m1;
sub.mark0 = m0;
sub.mark1 = m1;
return is;
}
istream& operator>>(istream& is, Student& st)
{
char n1[50];
char n2[50];
is >> n1;
is >> n2;
strcpy_s(st.name, n1);
strcpy_s(st.surname, n2);
if (!is) return is;
while (true)
{
Subject sub;
if (!(is >> sub)) break;
st.my_marks.push_back(sub);
}
return is;
}
I have tried this, but still the same:
string temp
ifs >> s1;
getline(ifs, temp);
group.push_back(s1);
And this:
char n1[50];
char n2[50];
for (int i = 0;; ++i)
{
char n0;
is.get(n0);
if (isspace(n0)) break;
n1[i] = n0;
}
for (int i = 0;; ++i)
{
char n0;
is.get(n0);
if (isspace(n0)) break;
n2[i] = n0;
}
if (!is) return is;
strcpy_s(st.name, n1);
strcpy_s(st.surname, n2);
Then i added ':' after every Name of Student and used is.get(n1, 100, ':').
It still reads the first line correctly, but refuses to read the next. Whatever i did, i can`t move text cursor to the beginning of new line. If anyone can help me, i would appreciate it.

Answer 1

Your second student is not being read because you put the stream in a bad state reading the first student.
if (!(is >> sub)) break;
You basically read subjects until the input breaks (which is when you hit a name). Since you don't reset the state of the stream to good any further attempts to read will be ignored.
You have two choices.
Set the state to good after you have finished reading the subjects.
This has an issue in that you will probably go into a infinite loop as your checking of the stream state is spotty currently.
Read a line then parse the subject information from the line.
I would go for option 2.
// After you have read the name.
// The rest of the line is scores. So read a whole line.
std::string line;
std::getline(is, line);
// convert the line into a stream.
std::stringstream linestream(line);
// Now parse the stream for subject.
Subject sub;
while(linestream >> sub) { // Note this reads an item and checks the
// state of the stream. The while body
// is only entered on a successful read.
st.my_marks.push_back(sub);
}