1 #ifndef SET_H_

     2 #define SET_H_

     3 

     4 typedef class pair pair;

     5 typedef class iterator iterator;

     6 

     7 #define MAX 50

     8 

     9 

    10 

    11 class set

    12 {

    13    private:

    14 		int n; 

    15 		pair* el;

    16    public:

    17 		set(); //constructor

    18 		int addElem(pair e);  //adds the specified pair to this set

    19 		int delElem(pair e); //removes the specified pair from this set

    20 		int belongs(pair e); // returns true if this set contains the e pair.

    21 		int length(); //returns the number of pairs in this set

    22     	int isEmpty(); //returns true if this set contains no pairs.

    23 		pair getElem(int i); //returns the i-th pair 

    24 		iterator* setIterator(); //returns an iterator over the pairs in this set.

    25 		~set(); //destructor

    26 };

    27 

    28 class iterator

    29 {

    30 	private:         

    31 		set* s;

    32   		int current; //current refers the current pair

    33 	public:

    34     	iterator(set* sc); //constructor

    35    		~iterator(); //destructor

    36     	pair getElem(); //returns  the current pair 

    37     	int hasNext(); //returns true if the iteration has more pairs.

    38 		void next(); // moves the current to the next pair

    39     	void setToFirst(); // first pair is current

    40 };

    41 

    42 class pair

    43 {

    44 	private:

    45 		int anum1;

    46 		int anum2;

    47 	public:

    48 		pair();

    49 		pair(int num1, int num2);

    50 		~pair();

    51 		int getNum1();

    52 		int getNum2();

    53 };

    54 

    55 

    56 #endif /*SET_H_*/