base class initialization

[the one]

The last class doesn't compile.
Any suggestion ?

I've tried both
CDerivedEx( int x, CString s, int a ) : CDerived( s, a ) : CBase( a )
and
CDerivedEx( int x, CString s, int a ) : CDerived( s, a ) , CBase( a )


Both gets error! ??



class CBase
{
CBase( int a ){;};
CBase( CString s ){;};

~CBase(){;};
};


class CDerived : public CBase
{
CDerived( CString s, int a ) : CBase( s ) {;}; //with string
~CDerived( ){;};
};


class CDerivedEx : public CDerived
{
CDerivedEx( int x, CString s, int a ) : CDerived( s, a ) : CBase( a ){;}; // with int
~CDerivedEx{;};
};