It won' t compile but it may build

//These codes will build but wil not compile. I hope someone would know why;
and tell me.

//I got the below error message during compile time

#include "stdafx.h" #include <string.h> #include <string> #using
<mscorlib.dll> #include <tchar.h>

using namespace System; using namespace std; __gc class Month

{

public:

Month(int, int); // provide a default value (4 here) if you want

int getDayOfWeek () {return dayOfWeek;}; //line 17 <-----X

private:

int dayOfWeek ; // This must be initialized with a constant

int weekOfMonth ;

int pDaysOfMonth __gc [,];};

int _tmain()

{Month *March;

Console::Write(March->getDayOfWeek()); // line 31 <--------X

return 0;}

Month::Month(int val1,int val2)

{ Console::Write(S"The default constructor is called\n");

weekOfMonth = val1; // this will be 4 if parameter not specified

dayOfWeek = val2;

pDaysOfMonth = new int __gc[weekOfMonth,dayOfWeek];}

/* Unhandled Exception: System.NullReferenceException: Object reference not
set to

an instance of an object.

line 17 line 31*/