c++考试助攻，class Part
{ public:
Part( int x=0) ：val(x) { cout<<val; }
~ Part() { cout<<val; }
private:
int val ;
} ;
class Whole
{ public :
Whole ( int x , int y , int z=0 ) : p2(x) ,p1(y) , val(z)
{ cout<<val ; }
~ Whole() { cout<<val ; }
private :
Part p1, p2 ;
int val ;
} ;
void main()
{ Whole obj(1,2,3); }
