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dose not make sense ?

ward (11)
hi for every body
this is code for queue using array during my work i found these errors that dosent make any sense

so the code file 
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// specifeaction  file 
	
const int MAXSZ=5;
	class queue
	{
	public:
		queue();
		bool isfull()const;
		bool isempty()const;
		void Enqueue(int);
		void Dqueue(int&);

	private:
		int data[MAXSZ];
		int f;
		int r;
	};


 // implemntaion file
# include<iostream>
# include"queue.h"
# include<string>

# include<cstdlib>
using namespace std;


queue::queue()

{
	f=r=-1;
}

bool queue::isfull()const
{
	return((f==0&&r==MAXSZ-1)||r=f-1);
}
bool queue::isempty()const
{
	return(f==-1&&r==-1);
}
void queue:: Enqueue(int n)
{
if(isfull())
cout<<" QUEUE IS FULL\n";
else 
{	if(r==MAXSZ-1)
			r=0;
else	
r++;
	//r=(r+1)%MAXSZ;

		data[r]=n;

}
}




		void Dqueue(int& n)
		{


			if(isempty())
				cout<<" the QUEUE IS EMPTY\n";
			else 
			{
				if(f==r)
					f=r-1;
				else if( f==MAXSZ-1)
					f=0;
				else f++;
			}
			//f=(f+1)%Mxsz;
		}




// the clint file

# include<iostream>
# include"queue.h"
# include<string>
# include<stddef>


using namespace std;

int main()
{

queue q1;
q1.Enqueue(10);
q1.Enqueue(20);
q1.Enqueue(30);
q1.Enqueue(40);

q1.Enqueue(50);
cout<<" the queue :  "<<q1.Enqueue(num)<<endl;
q1.Dqueue(num);
cout<<" the queue after  deleting :    "<<q1.Dqueue(num)<<endl;
q1.Enqueue(60);
cout<<" the queue :  "<<q1.Enqueue(num)<<endl;





	return 0;
}




the errors are


'f' : undeclared identifier
'r' : undeclared identifier
'=' : left operand must be l-value
fatal error C1083: Cannot open include file: 'stddef': No such


Bazzy (6281)
You didn't put queue:: before Dqueue on line 67
You should also indent your code better
ward (11)

thx for u
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