/*----------------------------------------------------------------------  File     : data.h  Contents : data set management----------------------------------------------------------------------*/#ifndef _DATA_CLASS#define _DATA_CLASS#include <stdio.h>#include <stdlib.h>#define TransLen 50class Transaction{public:		Transaction():maxlength(TransLen), length(0){ t = new int[maxlength];}	void DoubleTrans(int);				// if current item is greater than current longest transaction, we change the length of t as 2*item	~Transaction(){delete []t;}  	int maxlength;	int length;	int *t;};class Data{ public:		Data(char *filename);	~Data();	int isOpen();	void close(){if(in)fclose(in);}	Transaction *getNextTransaction(Transaction* Trans);   private:  	FILE *in;};#endif