Thread: Why is my program no dequeueing?

Why is my code not dequeueing here:

Code:

if(arrive != i)
{
Queue.Enqueue(customer);
//i = arrive;
}

else if(arrive == i)
{
    Queue.Dequeue();
    service = rand()%100;
    Outfile<<service<<endl;
}


//******************************************************************//
//Program Queue client file                                         //
//                               //
//  //
//   //
//                                                               //
//                                                                  //
//                                                                  //
//******************************************************************//

#include<iostream>
#include<iomanip>
#include<fstream>
#include<cstdlib>
#include"Queue.h"
#include"QueueImpl.cpp"

const int loopcounter = 200;
using namespace std;


//int CalculateTime(int service);


int main()
{
    IntQueue Queue;
         
    ifstream Infile;
    ofstream Outfile;
    Infile.open("inputQ.txt");
    Outfile.open("OUTPUTQ.TXT");
    int y = rand();
    int x = rand();
    int minutes = 720;
    int arrive, service, currentperson_time, nextperson, NextCustomer;
    int arrivaltimenewcust, servicetimeNew, oldValue;
    int MaxCust= 3;
    int i = 0;
    int customer = 0;
int CustomerNumber=0;
int runningtime;
int time=0;


y = rand();
x = rand();
Infile>>customer;

while(i < loopcounter )
{
    i++;
//Infile>>customer;

CustomerNumber = customer;
srand(customer);
arrive = rand()%100;  //First cutsomer arrival time
service = rand()%100;     //First customer service time

if(arrive != i)
{
Queue.Enqueue(customer);
//i = arrive;
}

else if(arrive == i)
{
    Queue.Dequeue();
    service = rand()%100;
    Outfile<<service<<endl;
}
Outfile<<"Customer "<<customer<<endl;
Outfile<<"Customer "<<customer<<" arrival time "<<arrive<<endl;
Outfile<<"Customer "<<customer<<" service time "<<service<<endl;
customer++;
}
Infile>>customer;

return 0;
}
//Implementation
#include<stddef.h>

typedef NodeType* NodePtr;

struct NodeType
{
    int data;
    NodePtr link;
};
////////////////////////////////////////////////////////////////////
void CopyList(NodePtr, NodePtr&, NodePtr&);
IntQueue::IntQueue()
{
    front = rear = NULL;
}

////////////////////////////////////////////////////////////////////
IntQueue::~IntQueue()
{
    NodePtr tempPtr;

    while(front != NULL)
    {
         tempPtr = front;
         front = tempPtr->link;
         delete tempPtr;
    }
}
/////////////////////////////////////////////////////////////////////
IntQueue::IntQueue(const IntQueue& otherQ)
{
    if(otherQ.front == NULL)
         front = rear = NULL;
    else
         CopyList(otherQ.front, front, rear);
}
//////////////////////////////////////////////////////////////////////
void IntQueue::Enqueue(int newItem)
{
    NodePtr newPtr = new NodeType;
    newPtr->data = newItem;
    newPtr->link = NULL;
    if(front == NULL)
         front = rear = newPtr;
    else{
         rear->link = newPtr;
         rear = newPtr;
    }
}
//////////////////////////////////////////////////////////////////////
int IntQueue::Front() const
{
    return front->data;
}
//////////////////////////////////////////////////////////////////////
void IntQueue::Dequeue()
{
    NodePtr tempPtr = front;
    front = tempPtr->link;
    delete tempPtr;
    if(front == NULL)
         rear = NULL;
}
//////////////////////////////////////////////////////////////////////
void CopyList(NodePtr currPtr, NodePtr& cloneFront, NodePtr& cloneRear)
{
    NodePtr newPtr = NULL; {
    CopyList(currPtr->link, cloneFront, cloneRear);
    newPtr = new NodeType;
    newPtr->data = currPtr->data;
    newPtr->link = cloneFront;
    if(currPtr->link == NULL)
         cloneRear = newPtr;
}
cloneFront = newPtr;
}
//header
struct NodeType;

class IntQueue 
{

public:
    IntQueue();
         IntQueue(const IntQueue& otherQ);
    void Enqueue(int newItem);
    int Front() const;
    void Dequeue();
    ~IntQueue();
private:
    NodeType* front;
    NodeType* rear;
};

Hmm.. I was too hungry to think about the code last time.

Use indentation, so others (and also you) can easily determine where the while loop ends.

The if part of else..if (else if(arrive == i)) is redundant, it's always true.

You can try to debug it with lesser amount of unused variables (x, y) and random values. In my opinion, first you should debug the queue, when it is working fine, you can try it in other application and debugging of that application will be easier.

So enqueue some numbers, look at their values (function like printQueue() will help a lot), then dequeue them and watch...