Code:

#include<iostream.h>
#include<conio.h>

struct Node { 
int a,b; 
Node *link; 
};

Node *front=NULL, *rear=NULL, *ptr=NULL;

Node* createNode(int i, int j)
{ 
 ptr = new Node;
 ptr->a=i;
 ptr->b=j;
 ptr->link=NULL;
 return ptr;
}


void Insert(Node *newptr)
{
  if(rear!=NULL)
   rear->link=newptr;
  rear=newptr;
  if(front==NULL)
   front=newptr;
}

void Delete()
{
 if(front==NULL)
  cout<<"Queue underflow!!";
 else
 {
  ptr=front;
  front=front->link;
  delete ptr;
 }
}

void displayQueue()
{
 ptr=front;
 cout<<"\nFront --> ";
 while(ptr!=NULL)
 {
 cout<<"("<<ptr->a<<","<<ptr->b<<")";
 ptr=ptr->link;
 if(ptr!=NULL)
  cout<<" --> ";
 }
 cout<<" <-- Rear \n";
}

int main()
{

 char ch='y';

 int a, b;

 cout<<"Do you want to add a new node?[y/n]";
 cin>>ch;

 while(ch=='y')
 {
  cout<<"\nEnter a:";
  cin>>a;
  cout<<"\nEnter b:";
  cin>>b;
  
  Insert(createNode(a, b));

  cout<<"\nDo you want to add another node?[y/n]";
  cin>>ch;
 }

 cout<<"\nDisplaying Queue!\n";
 displayQueue();

 cout<<"\nDo you want to remove the front node?[y/n]";
 cin>>ch;

 while(ch=='y')
 {
  Delete();
  cout<<"\nDo you want to remove another node from front?[y/n]";
  cin>>ch;
 }
 
 cout<<"\nDisplaying Queue!\n";
 displayQueue();
 
 cout<<"\nPress any key...";
 getch();
 return 0;
}







Output:


Do you want to add a new node?[y/n]y

Enter a:<any num 1>

Enter b:<any num 2>

Do you want to add another node?[y/n]y

Enter a:<any num 3>

Enter b:<any num 4>

<..add as much nodes as you want..>

Do you want to add another node?[y/n]y

Enter a:<any num m>

Enter b:<any num n>

Displaying Queue!

Front --> (<num 1>, <num 2>) --> (<num 3>, <num 4>) --> <...other nodes you added....> --> (<num m>, <num n>) <-- Rear

Do you want remove the front node?[y/n]y

Do you want to remove another node from front?[y/n]n
<..remove as many nodes as you want..........>

Displaying Queue!

Front --> (<num 3>, <num 4>) --> <...nodes you added minus deleted....> --> (<num m>, <num n>) <-- Rear

Press any key...



**msg me if any you've any problem; esp. output..**