Thomas8.cpp

// Assignment 8 - COSC 1410
// TA: Can Cao
// Author: Micah Thomas
#include <cstdio>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <cstring>

using namespace std;

ifstream inStream;

struct STUDENT {
  int id;
  char fname[20];
  char lname[20];
  char email[40];
  double gpa;
};

struct ROSTER {
  STUDENT records[100];
  int students;
};

bool getRecord(int &recNum, int &id, char fname[], char lname[], char email[], double &gpa);
void loadData(struct ROSTER &data);
void printData(struct ROSTER data);
void printStudent(struct STUDENT data);
int searchId(struct ROSTER data);
int searchName(struct ROSTER data);
bool menu(struct ROSTER data);

int main() {
  ROSTER compsci;
  loadData(compsci);
  while (menu(compsci));
}

bool getRecord(int &recNum, int &id, char fname[], char lname[], char email[], double &gpa) {
  if (recNum == 0) {
    inStream.open("prog8in.txt");
    if (inStream.fail()) {
      cout << "File \"prog8in.txt\" cannot be opened." << endl;
      cout << "Press ENTER to continue ...";
      cin.get();
      return false;
    } else cout << "File \"prog8in.txt\" opened." << endl;
  }
  inStream >> id >> fname >> lname >> email >> gpa;
  if (inStream.eof()) return false;
  else {
    recNum++;
    return true;
  }
}

void loadData(struct ROSTER &data) {
  data.students = 0;
  int recNum = 0;
  int id;
  char fname[20];
  char lname[20];
  char email[40];
  double gpa;
  while (getRecord(recNum, id, fname, lname, email, gpa)) {
    data.records[data.students].id = id;
    strcpy(data.records[data.students].fname, fname);
    strcpy(data.records[data.students].lname, lname);
    strcpy(data.records[data.students].email, email);
    data.records[data.students].gpa = gpa;
    data.students = recNum;
  }
  printData(data);
  cout << "\n\n";
}

void printData(struct ROSTER data) {
  for (int i = 0; i < data.students; i++) {
    cout << "\n\nStudent[" << i << "]";
    printStudent(data.records[i]);
  }
}

void printStudent(struct STUDENT data) {
  cout << "\nID:\t\t" << data.id;
  cout << "\nFIRST NAME:\t" << data.fname;
  cout << "\nLAST NAME:\t" << data.lname;
  cout << "\nEMAIL:\t\t" << data.email;
  cout << "\nGPA:\t\t" << data.gpa;
}

int searchId(struct ROSTER data) {
  int id;
  cout << "Search for student with ID: ";
  cin  >> id;
  for (int i = 0; i < data.students; i++) {
    if (data.records[i].id == id)
      return i;
  }
  cout << "Couldn't find ID: " << id;
  return -1;
}

int searchLName(struct ROSTER data) {
  char lname[20];
  cout << "Search for student with Last Name: ";
  cin  >> lname;
  for (int i = 0; i < data.students; i++) {
    if (strcmp(data.records[i].lname, lname) == 0)
      return i;
  }
  cout << "Couldn't find Last Name: " << lname;
  return -1;
}

bool menu(struct ROSTER data) {
  int choice, id;
  cout << "\n********** Class Roster **********"
       << "\nTotal Students = " << data.students;
  cout << "\n1. Display all students";
  cout << "\n2. Search a student by ID";
  cout << "\n3. Search a student by Last Name";
  cout << "\n4. Exit";
  cout << "\n>> ";
  cin >> choice;
  switch (choice) {
    case 1:
      cout << "\n\nShowing Records:";
      printData(data);
      break;
    case 2:
      id = searchId(data);
      if (id != -1)
        printStudent(data.records[id]);
      cout << "\n\nPress ENTER to continue...";
      cin.get();
      cin.get();
      break;
    case 3:
      id = searchLName(data);
      if (id != -1)
        printStudent(data.records[id]);
      cout << "\n\nPress ENTER to continue...";
      cin.get();
      cin.get();
      break;
    case 4:
      return false;
      break;
    default:
      return false;
      break;
  }
  return true;
}