// You are given a partially completed program that creates a list of students.

// Each student has the corresponding information: name, roll number and student type.

// This information is stored as an object of Student class.

// The classes Undergrad and Grad are child classes of the Stduent class.

// When adding a new student, these child classes are used to make the student node of the list.

//

// To begin, you should trace through the given code and understand how it works.

// Please read the instructions above each required function and follow the directions carefully.

// Do not modify given code.

//

// You can assume that all input is valid:

// Valid name: String containing alphabetical letters

// Valid roll number: a positive integer

#include

#include

#include

#include "Container.h"

#include "student.h"

#include "grad.h"

#include "undergrad.h"

using namespace std;

// forward declarations of functions already implemented:

void executeAction(char c);

Student* searchStudent(string name_input);

// forward declarations of functions that need implementation:

void addStudent(string name_input, int rollNo_input, studentType type); // 7 points

void displayList(); // 4 points

void save(string fileName); // 7 points

void load(string fileName); // 7 points

Container* list = NULL; // global list

int main()

{

char c = 'i'; // initialized to a dummy value

load("list.txt"); // During first execution, there will be no list.txt in source directory. list.txt is generated by save() while exiting the program.

do {

cout << " CSE240 HW10 ";

cout << "Please enter your selection: ";

cout << "\t a: add a new student to the list ";

cout << "\t d: display list of students ";

cout << "\t c: change roll number of a student ";

cout << "\t q: quit ";

cin >> c;

cin.ignore();

executeAction(c);

} while (c != 'q');

save("list.txt");

list = NULL;

return 0;

}

// Ask for details from user for the given selection and perform that action

// Read the function case by case

void executeAction(char c)

{

string name_input;

int rollNo_input;

int type_input = 2;

studentType type;

Student* studentFound = NULL;

switch (c)

{

case 'a': // add student

// input student details from user

cout << endl << "Enter student's name: ";

getline(cin, name_input);

cout << "Enter roll number: ";

cin >> rollNo_input;

cin.ignore();

while (!(type_input == 0 || type_input == 1))

{

cout << endl << "Enter student type: " << endl;

cout << "0. Undergrad " << endl;

cout << "1. Grad" << endl;

cin >> type_input;

cin.ignore();

}

type = (studentType)type_input;

// searchStudent() will return the student node if found, else returns NULL

studentFound = searchStudent(name_input);

if (studentFound == NULL)

{

addStudent(name_input, rollNo_input, type);

cout << endl << "Student added to list!" << endl << endl;

}

else

cout << endl << "Student already present in the list!" << endl << endl;

break;

case 'd': // display the list

displayList();

break;

case 'c': // change roll number

cout << endl << "Enter student's name: ";

getline(cin, name_input);

// searchStudent() will return the student node if found, else returns NULL

studentFound = searchStudent(name_input);

if (studentFound == NULL)

{

cout << endl << "Student not in list!" << endl << endl;

}

else

{

// if stduent exists in the list, then ask user for new roll number

cout << endl << "Enter new roll number: ";

cin >> rollNo_input;

cin.ignore();

// Q3c Call changeRollNo() here (1 point)

// 'studentFound' contains the student whose roll number is to be changed.

// 'rollNo_input' contains the new roll number of the student.

// Call the function with appropriate function arguments.

void changeRollNo(Student *studnet, int RollNo);

cout << endl << "Roll number changed!" << endl << endl;

}

break;

case 'q': // quit

break;

default: cout << c << " is invalid input! ";

}

}

// No implementation needed here, however it may be helpful to review this function

Student* searchStudent(string name_input)

{

Container* tempList = list; // work on a copy of 'list'

while (tempList != NULL) // parse till end of list

{

if (tempList->student->getName() == name_input)

{

return tempList->student; // return the student if found

}

tempList = tempList->next; // parse the list

}

return NULL; // return NULL if student not found in list

}

// Q3b: Define Friend Function changeRollNo() (3 points)

// Define the function changeRollNo()that is declared in student.h file.

// This function sets the new roll number of the student. The student and new roll number is to be passed as function arguments.

// Call this function in case 'c' of executeAction(). While testing, use 'd' display option after using 'c' option to verify whether the new roll number is set.

// You will need to implement add() and displayList() before you test this function.

// Q4: addStudent (7 points)

// This function is used to add a new student to the global linked list 'list'. You may add the new student to head or tail of the list. (Sample solution adds to tail)

// New student can be either undergrad or grad. You will need to use the function argument type to determine which constructor to use to create new student node.

// For example, if the user enters undergrad student, then you need to use Undergrad class and constructor to create new student node and add it to the list.

// NOTE: In executeAction(), searchStudent() is called before this function. Therefore no need to check here if the student exists in the list.

// See how this fucntion is called in case 'a' of executeAction()

void addStudent(string name_input, int rollNo_input, studentType type)

{

Container* tempList = list; // work on a copy of 'list'

}