I need help with question 4, 5a, and 5b. You can only answer one if you want I w
ID: 3931847 • Letter: I
Question
I need help with question 4, 5a, and 5b. You can only answer one if you want I would appreciate any help, thank you!
// Q1a: Create Dog Class
// Part 1: Create a child class of the Pet class named 'Dog'
// See the add function in hw10.cpp for proper use of this function.
// Part2: Declare constructor which accepts the same 3 parameters as the parent class Pet.
// Pass the 3 parameters to the super constructor in the Pet class.
// Part 3: Re-declare the method display (virtual method found inside of parent class Pet)
// Q2a: Define Display for Dog class
// Define the method display that you declared within the Dog class in the header file
// Information should be printed in the following format:
// Name:
// Breed:
// Type: Dog
// (See the print_all function in hw10.cpp for proper use of this function.)
// READ BEFORE YOU START:
// You are given a partially completed program that creates a list of pets.
// Each pet has the corresponding information: name, breed, and type.
// In the Pet.h file, you will find the definition for this enum 'type'.
// Pets on the list can be 2 different 'types' : either a dog or a cat.
// The classes Dog and Cat are subclasses of the Pet class (found in Pet.h).
// Both of these classes will have their own use of the virtual display method.
//
// 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.
// If you modify any of the given code, the return types, or the parameters, you risk failing the automated test cases.
//
// You are to assume that all input is valid:
// Valid name: String containing alphabetical letters beginning with a capital letter
// Valid breed: String containing alphabetical letters beginning with a capital letter
// All input will be a valid length and no more than the allowed amount of memory will be used
#include "Container.h"
#include "Pet.h"
#include "Dog.h"
#include "Cat.h"
#include
#include
#include
using namespace std;
// forward declarations
void flush();
void branching(char);
void helper(char);
void add_pet(string, string, Type);
Pet* search_pet(string, string, Type);
void remove_pet(string, string, Type);
void remove_all();
void print_all();
void save(string); // 10 points
void load(string); // 10 points
Container* list = NULL; // global list
int main()
{
_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF); // Use to check for memory leaks in VS
load("Pets.txt");
char ch = 'i';
do {
cout << "Please enter your selection" << endl;
cout << " a: add a new pet to the list" << endl;
cout << " c: change the breed of a pet" << endl;
cout << " r: remove a pet from the list" << endl;
cout << " p: print all pets on the list" << endl;
cout << " q: quit and save list of pets" << endl;
cin >> ch;
flush();
branching(ch);
} while (ch != 'q');
save("Pets.txt");
remove_all();
list = NULL;
return 0;
}
void flush()
{
int c;
do c = getchar(); while (c != ' ' && c != EOF);
}
void branching(char c)
{
switch (c) {
case 'a':
case 'c':
case 'r':
case 'p':
helper(c);
break;
case 'q':
break;
default:
printf(" Invalid input! ");
}
}
// The helper function is used to determine how much data is needed and which function to send that data to.
// It uses pointers and values that are returned from some functions to produce the correct ouput.
// There is no implementation needed here, but you should study this function and know how it works.
// It is always helpful to understand how the code works before implementing new features.
// Do not change anything in this function or you risk failing the automated test cases.
void helper(char c)
{
string name, breed;
Type type;
int type_check = -1;
if (c == 'p')
print_all();
else
{
cout << endl << "Please enter the pet's name: " << endl;
cin >> name;
cout << "Please enter the pet's breed: " << endl;
cin >> breed;
while (!(type_check == 0 || type_check == 1))
{
cout << endl << "Please select one of the following: " << endl;
cout << "0. Dog " << endl;
cout << "1. Cat" << endl;
cin >> type_check;
}
type = (Type)type_check;
Pet* pet_result = search_pet(name, breed, type);
if (c == 'a') // add pet
{
if (pet_result == NULL)
{
add_pet(name, breed, type);
cout << endl << "Pet added." << endl << endl;
}
else
cout << endl << "Pet already on list." << endl << endl;
}
else if (c == 'c') // change pet breed
{
if (pet_result == NULL)
{
cout << endl << "Pet not found." << endl << endl;
return;
}
cout << endl << "Please enter the new breed for this pet: " << endl;
cin >> breed; flush();
// Q3c: Call Change Breed Function
cout << endl << "Pet's breed changed." << endl << endl;
}
else if (c == 'r') // remove pet
{
if (pet_result == NULL)
{
cout << endl << "Pet not found." << endl << endl;
return;
}
remove_pet(name, breed, type);
cout << endl << "Pet removed from the list." << endl << endl;
}
}
}
// Q3b: Define Friend Function Change Breed
// Define the function changeBreed that is declared within the Pet.h file.
// This function sets the breed value of the Pet pointer to the value of the string parameter.
// Q4: Add Pet
// This function will be used to add a new pet to the tail of the global linked list.
// You will need to use the enum ëtypeí variable to determine which constructor to use.
// Remember that search is called before this function, therefore, the new pet is not on the list.
void add_pet(string name, string breed, Type type)
{
}
// No implementation needed here, however it may be helpful to review this function
Pet* search_pet(string name, string breed, Type type)
{
Container* container_traverser = list;
while (container_traverser != NULL)
{
if (container_traverser->pet->getName() == name
&& container_traverser->pet->getBreed() == breed
&& container_traverser->pet->getType() == type)
return container_traverser->pet;
container_traverser = container_traverser->next;
}
return NULL;
}
// No implementation needed here, however it may be helpful to review this function
void remove_pet(string name, string breed, Type type)
{
Container* to_be_removed;
if (list->pet->getName() == name
&& list->pet->getBreed() == breed
&& list->pet->getType() == type)
{
to_be_removed = list;
list = list->next;
delete to_be_removed->pet;
delete to_be_removed;
return;
}
Container* container_traverser = list->next;
Container* container_follower = list;
while (container_traverser != NULL)
{
if (container_traverser->pet->getName() == name
&& container_traverser->pet->getBreed() == breed
&& container_traverser->pet->getType() == type)
{
to_be_removed = container_traverser;
container_traverser = container_traverser->next;
container_follower->next = container_traverser;
delete to_be_removed->pet;
delete to_be_removed;
return;
}
container_follower = container_traverser;
container_traverser = container_traverser->next;
}
}
// No implementation needed here, however it may be helpful to review this function
void remove_all()
{
while (list != NULL)
{
Container* temp = list;
list = list->next;
delete temp->pet;
delete temp;
}
}
// This function uses the virtual display() method of the Dog and Cat classes to print all Pets in an oragnized format.
void print_all()
{
Container *container_traverser = list;
if (list == NULL)
cout << endl << "List is empty!" << endl << endl;
while (container_traverser != NULL)
{
container_traverser->pet->display();
container_traverser = container_traverser->next;
}
}
// Q5a: Save (5 points)
// Save the linked list of pets to a file using ofstream.
// You will need to come up with a way to store the amount of Containers in linked list.
// Hint: You may want to cast the enum 'type' to an int before writing it to the file.
void save(string fileName)
{
}
// Q5b: Load (5 points)
// Load the linked list of pets from a file using ifstream.
// You will need to create the linked list in the same order that is was saved to a file.
// You will need to create a new node for the linked list, then add it to the tail of the list.
// Hint: If you casted the enum 'type' to an int, you will need to cast it back to a 'Type'.
// You will use the 'type' variable read from the file to determine which constructor to use.
void load(string fileName)
{
}
Explanation / Answer
Here is the updated code for the question. Since you have not pasted the code for the header files Container.h, Pet.h, Dog.h and Cat.h, I had to create my own versions of these files. But you may use your own files for those and just use the code for Q4, Q5a and Q5b i.e. add_pet(), load() and save() functions alone.
#include "Container.h"
#include "Pet.h"
#include "Dog.h"
#include "Cat.h"
#include <iostream>
#include <fstream>
//#include
using namespace std;
// forward declarations
void flush();
void branching(char);
void helper(char);
void add_pet(string, string, Type);
Pet* search_pet(string, string, Type);
void remove_pet(string, string, Type);
void remove_all();
void print_all();
void save(string); // 10 points
void load(string); // 10 points
Container* list = NULL; // global list
int main()
{
_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF); // Use to check for memory leaks in VS
load("Pets.txt");
char ch = 'i';
do {
cout << "Please enter your selection" << endl;
cout << " a: add a new pet to the list" << endl;
cout << " c: change the breed of a pet" << endl;
cout << " r: remove a pet from the list" << endl;
cout << " p: print all pets on the list" << endl;
cout << " q: quit and save list of pets" << endl;
cin >> ch;
flush();
branching(ch);
} while (ch != 'q');
save("Pets.txt");
remove_all();
list = NULL;
return 0;
}
void flush()
{
int c;
do c = getchar(); while (c != ' ' && c != EOF);
}
void branching(char c)
{
switch (c) {
case 'a':
case 'c':
case 'r':
case 'p':
helper(c);
break;
case 'q':
break;
default:
printf(" Invalid input! ");
}
}
// The helper function is used to determine how much data is needed and which function to send that data to.
// It uses pointers and values that are returned from some functions to produce the correct ouput.
// There is no implementation needed here, but you should study this function and know how it works.
// It is always helpful to understand how the code works before implementing new features.
// Do not change anything in this function or you risk failing the automated test cases.
void helper(char c)
{
string name, breed;
Type type;
int type_check = -1;
if (c == 'p')
print_all();
else
{
cout << endl << "Please enter the pet's name: " << endl;
cin >> name;
cout << "Please enter the pet's breed: " << endl;
cin >> breed;
while (!(type_check == 0 || type_check == 1))
{
cout << endl << "Please select one of the following: " << endl;
cout << "0. Dog " << endl;
cout << "1. Cat" << endl;
cin >> type_check;
}
type = (Type)type_check;
Pet* pet_result = search_pet(name, breed, type);
if (c == 'a') // add pet
{
if (pet_result == NULL)
{
add_pet(name, breed, type);
cout << endl << "Pet added." << endl << endl;
}
else
cout << endl << "Pet already on list." << endl << endl;
}
else if (c == 'c') // change pet breed
{
if (pet_result == NULL)
{
cout << endl << "Pet not found." << endl << endl;
return;
}
cout << endl << "Please enter the new breed for this pet: " << endl;
cin >> breed; flush();
// Q3c: Call Change Breed Function
cout << endl << "Pet's breed changed." << endl << endl;
}
else if (c == 'r') // remove pet
{
if (pet_result == NULL)
{
cout << endl << "Pet not found." << endl << endl;
return;
}
remove_pet(name, breed, type);
cout << endl << "Pet removed from the list." << endl << endl;
}
}
}
// Q3b: Define Friend Function Change Breed
// Define the function changeBreed that is declared within the Pet.h file.
// This function sets the breed value of the Pet pointer to the value of the string parameter.
// Q4: Add Pet
// This function will be used to add a new pet to the tail of the global linked list.
// You will need to use the enum ëtypeí variable to determine which constructor to use.
// Remember that search is called before this function, therefore, the new pet is not on the list.
void add_pet(string name, string breed, Type type)
{
Pet *p;
if(type == DOG)
{
p = new Dog(name, breed, type);
}
else //if not dog , its a cat
{
p = new Cat(name, breed, type);
}
Container *new_container = new Container();
new_container -> pet = p;
new_container -> next = NULL;
if(list == NULL)
{
list = new_container;
return ;
}
Container* container_traverser = list;
while (container_traverser->next != NULL)
{
container_traverser = container_traverser->next;
}
container_traverser->next = new_container;
}
// No implementation needed here, however it may be helpful to review this function
Pet* search_pet(string name, string breed, Type type)
{
Container* container_traverser = list;
while (container_traverser != NULL)
{
if (container_traverser->pet->getName() == name
&& container_traverser->pet->getBreed() == breed
&& container_traverser->pet->getType() == type)
return container_traverser->pet;
container_traverser = container_traverser->next;
}
return NULL;
}
// No implementation needed here, however it may be helpful to review this function
void remove_pet(string name, string breed, Type type)
{
Container* to_be_removed;
if (list->pet->getName() == name
&& list->pet->getBreed() == breed
&& list->pet->getType() == type)
{
to_be_removed = list;
list = list->next;
delete to_be_removed->pet;
delete to_be_removed;
return;
}
Container* container_traverser = list->next;
Container* container_follower = list;
while (container_traverser != NULL)
{
if (container_traverser->pet->getName() == name
&& container_traverser->pet->getBreed() == breed
&& container_traverser->pet->getType() == type)
{
to_be_removed = container_traverser;
container_traverser = container_traverser->next;
container_follower->next = container_traverser;
delete to_be_removed->pet;
delete to_be_removed;
return;
}
container_follower = container_traverser;
container_traverser = container_traverser->next;
}
}
// No implementation needed here, however it may be helpful to review this function
void remove_all()
{
while (list != NULL)
{
Container* temp = list;
list = list->next;
delete temp->pet;
delete temp;
}
}
// This function uses the virtual display() method of the Dog and Cat classes to print all Pets in an oragnized format.
void print_all()
{
Container *container_traverser = list;
if (list == NULL)
cout << endl << "List is empty!" << endl << endl;
while (container_traverser != NULL)
{
container_traverser->pet->display();
container_traverser = container_traverser->next;
}
}
// Q5a: Save (5 points)
// Save the linked list of pets to a file using ofstream.
// You will need to come up with a way to store the amount of Containers in linked list.
// Hint: You may want to cast the enum 'type' to an int before writing it to the file.
void save(string fileName)
{
//we will store the file in this format, first a line containing the type of pet is written
//then next line has the pet's name, and then the next line has the pet's breed.
//we choose to write each information on a separate line to allow the possiblity of having spaces
//in pet name and breed. The 3 lines repeat for each pet.
ofstream outfile(fileName.c_str());
Container *container_traverser = list;
if(!outfile.is_open())
{
cout<<"Could not open output file for writing : "<<fileName<<endl;
return;
}
while(container_traverser != NULL)
{
outfile<<(int)(container_traverser -> pet ->getType())<<" ";
outfile<<container_traverser -> pet -> getName()<<" ";
outfile<<container_traverser -> pet -> getBreed()<<endl;
container_traverser = container_traverser -> next;
}
outfile.close();
}
// Q5b: Load (5 points)
// Load the linked list of pets from a file using ifstream.
// You will need to create the linked list in the same order that is was saved to a file.
// You will need to create a new node for the linked list, then add it to the tail of the list.
// Hint: If you casted the enum 'type' to an int, you will need to cast it back to a 'Type'.
// You will use the 'type' variable read from the file to determine which constructor to use.
void load(string fileName)
{
string name, breed;
int type;
ifstream infile(fileName);
if(!infile.is_open())
{
cout<<"Error opening input file : "<<fileName<<endl;
return;
}
int idx;
while(infile>>type)
{
infile >> name >>breed;
Type t=(Type)type;
add_pet(name, breed, t);
}
infile.close();
}
My version of other header files....
Pet.h
#ifndef PET_H
#define PET_H
#include <iostream>
using namespace std;
enum Type {DOG, CAT};
class Pet
{
private:
string name, breed;
Type type;
public:
Pet(string n, string b, Type t):name(n),breed(b),type(t)
{}
string getName()
{
return name;
}
string getBreed()
{
return breed;
}
Type getType()
{
return type;
}
virtual void display()
{
}
};
#endif
Dog.h
#ifndef DOG_H
#define DOG_H
#include "Pet.h"
class Dog : public Pet
{
public:
Dog(string n, string b, Type t):Pet(n, b, t){};
void display()
{
cout<<"Name: "<<getName() <<endl;
cout<<"Breed: "<<getBreed() <<endl;
cout<<"Type: Dog"<<endl;
}
};
#endif
Cat.h
#ifndef CAT_H
#define CAT_H
#include "Pet.h"
class Cat : public Pet
{
public:
Cat(string n, string b, Type t):Pet(n, b, t){};
void display()
{
cout<<"Name: "<<getName() <<endl;
cout<<"Breed: "<<getBreed() <<endl;
cout<<"Type: Cat"<<endl;
}
};
#endif
Container.h
#ifndef CONTAINER_H
#define CONTAINER_H
#include "Pet.h"
class Container
{
public:
Pet *pet;
Container *next;
};
#endif
output
Error opening input file : Pets.txt
Please enter your selection
a: add a new pet to the list
c: change the breed of a pet
r: remove a pet from the list
p: print all pets on the list
q: quit and save list of pets
a
Please enter the pet's name:
Sheru
Please enter the pet's breed:
Pug
Please select one of the following:
0. Dog
1. Cat
0
Pet added.
Please enter your selection
a: add a new pet to the list
c: change the breed of a pet
r: remove a pet from the list
p: print all pets on the list
q: quit and save list of pets
a
Please enter the pet's name:
Scisor
Please enter the pet's breed:
Bulldog
Please select one of the following:
0. Dog
1. Cat
0
Pet added.
Please enter your selection
a: add a new pet to the list
c: change the breed of a pet
r: remove a pet from the list
p: print all pets on the list
q: quit and save list of pets
a
Please enter the pet's name:
Sweety
Please enter the pet's breed:
Persian
Please select one of the following:
0. Dog
1. Cat
1
Pet added.
Please enter your selection
a: add a new pet to the list
c: change the breed of a pet
r: remove a pet from the list
p: print all pets on the list
q: quit and save list of pets
p
Name: Sheru
Breed: Pug
Type: Dog
Name: Scisor
Breed: Bulldog
Type: Dog
Name: Sweety
Breed: Persian
Type: Cat
Please enter your selection
a: add a new pet to the list
c: change the breed of a pet
r: remove a pet from the list
p: print all pets on the list
q: quit and save list of pets
q
Initially Pets.txt did not exist and when program is quit, it is created.
Pets.txt
0 Sheru Pug
0 Scisor Bulldog
1 Sweety Persian