In this lesson, we will add internal member variables and methods to CPhBookObj to support storing and managing PhRec structures.
The first step is to add a constant for the maximum number of phone records. Open PhBookObj.h and add #define MAX_RECS 32 after #include resource.h.
After we've added the constant for the maximum number of phone records, we have to:

1. Add an array of PhRecs to CPhBookObj
2. Add a member variable, m_numrecs, to hold the number of records currently stored in m_PhRecs
3. Add member variable m_currec to hold the value of the CurRec property; a value of -1 indicates that CurRec is not set

Add Internal Member Variables
Finally, once we have added the member variables, we have to initialize m_numrecs and m_currec in the constructor of CPhBookObj in PhBookObj.h.

CPhBookObj() : m_numrecs(0), m_currec(-1)
{} 

Click the Exercise link below to apply what you have learned about adding and initializing member variables.
Adding Application Data - Exercise