Trouble with Int Queue

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Date: Mon, 24 May 2004 00:50:16 GMT

Good Day Folks,

The following is the code for an integer queue using a namespace. it compile
ok but i do not get the output that i expected...any help greatly
appreciated

thnaks
Barry
//*****************************************************
#ifndef INTQUEUE_H
#define INTQUEUE_H

namespace queueNamespace{
 class IntQueue{
  public:
  IntQueue(int = 20);
  IntQueue(const IntQueue&);
  ~IntQueue();
  IntQueue& operator=(const IntQueue&);
  void enQueue(int) throw (logic_error);
  int deQueue() throw (logic_error);
  int firstInLine() throw (logic_error);
        int size() throw (logic_error);
 private:
  int* queue_;
  int size_;
  int front_;
  int back_;
 };
}
#endif
//****************************************
//file: intQueue.cpp
#include <iostream.h>
using namespace std;
#include "intQueue.h"
using namespace queueNamespace;
//IntQueue class definitions.
  IntQueue::IntQueue(int size){
  queue_ = new int[size];
  size_ = size;
  front_ = 0;
  back_ = 0;
 for(int i = 0; i <= size_; ++i)
 queue_[i] = 0;//initializing array slots to 0
 }

 IntQueue::IntQueue(const IntQueue& s){
  front_ = s.front_;
  back_ = s.back_;
  size_ = s.size_;
  for(int i = 0; i <= size_; ++i)
   queue_[i] = s.queue_[i];
 }

 IntQueue& IntQueue::operator=(const IntQueue& s){
  if(this == &s)
   return *this;

  if(size_ != s.size_){
   delete [] queue_;
  queue_ = new int[s.size_];
  }
  front_ = s.front_;
  back_ = s.back_;
 size_ = s.size_;
  for(int i = 0; i <= size_; ++i)
   queue_[i] = s.queue_[i];
    return *this;
 }

 IntQueue::~IntQueue(){
  delete [] queue_;
 }

 void IntQueue::enQueue(int i) throw (logic_error){
  if(back_ == size_ - 1)
   throw logic_error("Queue Full...");
   queue_[++back_] = i;
 }

 int IntQueue::deQueue() throw (logic_error){
  if(back_ == 0)
   throw logic_error("Queue Empty...");
   return queue_[front_--];
 }

 int IntQueue::firstInLine() throw (logic_error){
  if(back_ == 0)
   throw logic_error("Queue Empty...");
   return queue_[front_];
 }
 int IntQueue::size() throw (logic_error){
   if(size_ < 0)
    throw logic_error("Invalid Size...");
    return size_;
 }
//****************************************
#include <iostream.h>
using namespace std;
#include "intQueue.h"
using namespace queueNamespace;
int main() {
  queueNamespace::IntQueue s;
  try{
        s.enQueue(115);
        s.enQueue(10);
        s.enQueue(15);
        s.enQueue(20);
        s.enQueue(25);
  }
  catch(const bad_alloc&){
          cout << "run out of memory" << endl;
  }
  catch(const logic_error& e) {
          cout << e.what() << endl;
  }

  try{
        for(int x = 0; x <= 5; x++)
          cout << "Slot " << x << ": " << s.deQueue() << endl;
 }
 catch(const bad_alloc&){
          cout << "run out of memory" << endl;
  }
  catch(const logic_error& e) {
          cout << e.what() << endl;
  }
 };

I added an initialization to the constructor to set all the elements of the
array to 0...but it does not seem to work.
only for element 0...not sure why???

any help greatly appreciated

• Previous message: Edo: "Debugging with jGRASP"
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