{

vector<Student_info> students;

Student_info record;

string::size_type maxlen = 0; // the length of the longest name

// read input file (added for 13-1)

ifstream studentFile("students.txt");

// read and storea all the student's data

// Invariant: students contains all the student records read so far

// maxlen contains the length of the longest name in students

while (record.read(studentFile)) { // Modified for class Student_info Ch. 9

// find length of the longest name

maxlen = max(maxlen, record.name().size());

students.push_back(record);

}

cout << "sort function" << endl;

// alphebetize the student records

sort(students.begin(), students.end(), Student_info::compare);

cout << "write loop" << endl;

// write the names and grades

for (vector<Student_info>::size_type i = 0; i != students.size(); i++) {

// write the name, padded on the right to maxlen + 1 characters

cout << students[i].name() << string (maxlen + 1 - students[i].name().size(), ' ');

string validity = students[i].valid() ? "valid" : "not valid";

cout << validity << endl;

// compute and write the grade

try {

double final_grade = students[i].grade();

streamsize prec = cout.precision();

cout << setprecision(3) << final_grade

<< setprecision(prec) << endl;

} catch (domain_error e) {

cout << e.what() << endl;

}

}

return 0;