//C++ circular doubly linked list. Please edit and compile. It throws a couple of syntax errors.

#include

#include

using namespace std;

struct QB{

public:

string firstName, lastName;

int numWins;

int years[4];

public:

QB* next;

QB* prev;

QB(string n1, string n2, int year)

{

firstName = n1;

lastName = n2;

numWins = 1;

years[0]=year;

}

void add_year(int year)

{

years[numWins]=year;

numWins++;

}

};

class QBList

{

private:

QB* head;

QB* tail;

public:

QBList()

{

head = NULL;

tail = NULL;

}

void add_to_list(string fname, string lname, int year)

{

if(head==NULL)

{

QB* newQB = new QB(fname,lname,year);

head = newQB;

tail = newQB;

}

else if(head == tail)

{

QB* newQB = new QB(fname,lname,year);

tail = newQB;

head->next= tail;

tail->prev= head;

}

else

{

bool found = 0;

QB* temp;

temp = head;

while(temp->next!= NULL)//this will break the loop

{

if(fname == temp->firstName && lname == temp->lastName)

{

found = 1;

break;

}

temp=temp->next; //so that the loop goes on

}

if(found)

{

temp->add_year(year);

}

else

{

QB* newQB = new QB(fname,lname,year);

newQB->prev = tail;

tail->next = newQB;

tail = newQB;

}

}

}

void search_name(string fname, string lname){

QB* temp = head;

while(temp->next!=NULL)

{

if(fname == temp->firstName && lname == temp->lastName)

{

cout<firstName<<"\t"<lastName<<"\t"<numWins<<"\t"<

}

temp=temp->next;

}

cout<<"The quareterback is not found.";

}

void search_num(int n){

QB* temp = head;

bool found =0;

while(temp->next!=NULL)

{

if(n==temp->numWins)

{

cout<firstName<lastName<numWins<

found=1;

}

temp=temp->next;

}

if(!found) cout<<"The quarterback is not found.";

}

// searching year

void search_year(int year){

QB* temp = head;

while(temp->next!=NULL)

{

for(int i = 0; inumWins; i++)

{

if(temp->years[i] == year){

cout<< temp->numWins<< endl;

}

temp=temp->next;

}

cout<<"The quareterback is not found.";

}

void search_num(int n){

QB* temp = head;

bool found =0;

while(temp->next!=NULL)

{

if(n==temp->numWins)

{

cout<firstName<lastName<numWins<

found=1;

}

temp=temp->next;

}

if(!found) cout<<"The quarterback is not found.";

}

void deleteList(){

QB* temp = head;

head=temp->next;

while(head->next!=NULL)

{

temp=head;

head=temp->next;

delete temp;

}

delete head;

}

void deleteEntry(string fname, string lname){

QB* temp = head;

while(temp->next!=NULL)

{

if(fname == temp->firstName && lname == temp->lastName)

{

temp->prev->next = temp->next;

temp->next->prev = temp->prev;

delete temp;

}

temp=temp->next;

}

}

};

// main

#include

#include

using namespace std;

int main()

{

string fname, lname;

int year;

ifstream qb_list("qblist.txt")

while(qb_list >> fname >>lname>> year){

add_to_list(fname, lname, year);

}

cout<<"1- Search by Number: ";

cout << "2- Search by Name: ";

cout << "3- Search by Year: ";

cout<< "4- Delete Entry: ";

cout<<"5- Delete list: ";

cout" 6- Exit: "

do{

int choice;

cin>>choice;

if(choice==1)

{

int num;

cin>>num;

LL.search_num(num);

}

if(choice == 2)

{

string fname;

cin>>fname;

string lname;

cin>>lname;

LL.search_name(fname,lname);

}

if(choice ==3)

{

string fname;

cin>>fname;

string lname;

cin>>lname;

LL.deleteEntry(fname,lname);

}

if(choice ==4)

{

LL.deleteList();

}

if(choice ==5)

{

break;

}

}

while(1);

}