Chap12.3 sample code

#include <fstream>
#include <iomanip>
#include <iostream>
#include <string>
using namespace std;

struct Student
{
  string name;
  int id;
  float gpa;
};
 
void printStudents(Student* student, int nStudents)
{
  int i;
  for (i = 0; i < nStudents; i++)
  {
    cout << "Name = " << left << setw(30) << student[i].name;
    cout.fill('0'); 
    cout << " ID = " << right << setw(7)
      << student[i].id << ", gpa = "
      << student[i].gpa << endl;
    cout.fill(' '); 
  }
}

int main()
{
  // open a file for input
  ifstream fin;
  fin.open("students.txt");
  if (!fin.good()) throw "I/O error";
 
  // create an empty list
  const int MAX_STUDENTS = 100; // capacity
  int nStudents = 0; // initially empty
  Student student[MAX_STUDENTS];
 
  // read and save the records
  while (fin.good())
  {
    // create a record and read it from file
    Student aStudent;
    getline(fin, aStudent.name);

    fin >> aStudent.id;
    fin.ignore(1000, 10);
 
    fin >> aStudent.gpa;
    fin.ignore(1000, 10);
 
    fin.ignore(1000, 10); // skip the ---------- separator

    // add record to list, if it's not full
    if (nStudents < MAX_STUDENTS)
      student[nStudents++] = aStudent;
  }
  fin.close();
 
  // sort the students by name
  for (int i = 0; i < nStudents; i++)
  {
    for (int j = i + 1; j < nStudents; j++)
    {
      if (student[i].name > student[j].name)
      {
        Student temp = student[i];
        student[i] = student[j];
        student[j] = temp;
      }
    }
  }

  printStudents(student, nStudents);
 
  return 0;
} // main