A simple Queue problem; please help
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#include<iostream>
using namespace std;
class Queue{
private:
int *queue;
int q;
int front;
int rear;
public:
Queue(int);
void enqueue(int);
void dequeue();
int size();
void display();
bool isEmpty();
bool isFull();
};
Queue::Queue(int x)
{
q=x;
queue=new int[q];
rear=-1;
front=0;
}
void Queue::enqueue(int x)
{
if(size()==q)
cout<<"Queue is full! ";
else{
queue[front]=x;
++rear;
}
}
void Queue::dequeue()
{
if(front>rear)
cout<<"Queue is empty! ";
else{
queue[rear++];
cout<<"The data dequeued is :"<<queue[rear];;
}
}
void Queue::display()
{
for(int i=front; i<=rear; i++)
cout<<queue[i]<<" ";
}
int Queue::size()
{
return (rear-front+1);
}
int main()
{
Queue q1(2);
int ch, x;
while(true){
cout<<"\n1. Enqueue\n2. Dequeue\n3. Size\n4. Display all element\n5. Quit";
cout<<"\nWhat do you want to do?\n";
cout<<"Enter your choice: ";
cin>>ch;
switch(ch){
case 1:
cout<<"\nEnter data: ";
cin>>x;
q1.enqueue(x);
break;
case 2:
q1.dequeue();
break;
case 3:
cout<<"Size of Queue is "<<q1.size();
break;
case 4:
q1.display();
break;
case 5:
exit(0);
break;
}
}
system ("Pause");
return 0;
}
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When I dequeue a value, it displays a garbage value. Whats wrong in the following function?
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void Queue::dequeue()
{
if(front>rear)
cout<<"Queue is empty! ";
else{
queue[rear++];
cout<<"The data dequeued is :"<<queue[rear];;
}
}
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Is there any other way to break the while loop(Line no. 61) in the program instead of using
(Line no. 87)?
Question 2: Probably break; will help.
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