Write a program implementing linked list as a class. Also Perform some required operations like inserting, deleting nodes & display the contents of entire linked list.

#include <iostream.h>
class linklist
{
struct node
{
int data;
node * link;
}*p;
public:
linklist( );
void append( int num );
void addatbeg( int num );
void addafter( int c, int num );
void del( int num );
void display( );
int count( );
~linklist( );
};
linklist::linklist( )
{
p = NULL;
}
void linklist::append( int num )
{
node * q,
* t;
if( p == NULL )
{
p = new node;
p->data = num;
p->link = NULL;
}
else
{
q = p;
while( q->link != NULL )
q = q->link;
t = new node;
t->data = num;
t->link = NULL;
q->link = t;
}
}
void linklist::addatbeg( int num )
{
node * q;
q = new node;
q->data = num;
q->link = p;
p = q;
}
void linklist::addafter( int c, int num )
{
node * q,* t;
int i;
for( i = 0, q = p; i < c; i++ )
{
q = q->link;
if( q = NULL )
{
cout << endl << "There are less than " << c << "element";
return;
}
}
t = new node;
t->data = num;
t->link = q->link;
q->link = t;
}
void linklist::del( int num )
{
node * q,* r;
q = p;
if( q->data == num )
{
p = q->link;
delete q;
return;
}
r = q;
while( q != NULL )
{
if( q->data == num )
{
r->link = q->link;
delete q;
return;
}
r = q;
q = q->link;
}
cout << endl << "Element" << num << "not found";
}
void linklist::display( )
{
node * q;
cout << endl;
for( q = p; q->link != NULL; q = q->link )
{
cout << endl << q->data;
}
int linklist::count( )
{
node * q;
int c = 0;
for( q = p; q != NULL; q = q->link )
c++;
return ( c );
}
linklist::~linklist( )
{
node * q;
if( p == NULL )
return;
while( p != NULL )
{
q = p->link;
delete p;
p = q;
}
}
void main( )
{
linklist ll;
cout << endl << "No. of elements in linked list= " << ll.count( );
ll.append( 11 );
ll.append( 22 );
ll.append( 33 );
ll.append( 44 );
ll.append( 55 );
ll.addatbeg( 100 );
ll.addatbeg( 200 );
ll.addatbeg( 300 );
ll.addafter( 3, 333 );
ll.addafter( 6, 444 );
ll.display( );
cout << endl << "No. of element in linked list =" << ll.count( );
ll.del( 300 );
ll.del( 66 );
ll.del( 0 );
ll.display( );
cout << endl << "No. of element in linked list =" << ll.count( );
}