有如下类声明:class XA{int x;public:XA(int n){x=n;}};class XB:public XA{int y;public:XB(int a, int b) ;};在构造函数XB的下列定义中,正确的是A.XB::XB(int a,int B) :x(A) ,y(B) {}B.XB::XB(int a,int B) :XA(A) ,y(B) {}C.XB::XB(int a,int B) :x(A) ,XB(B) {}D.XB::XB(int a,int B) :XA(A) ,XB(B) {}
有如下类声明:
class XA{
int x;
public:
XA(int n){x=n;}
};
class XB:public XA{
int y;
public:
XB(int a, int b) ;
};
在构造函数XB的下列定义中,正确的是
A.XB::XB(int a,int B) :x(A) ,y(B) {}
B.XB::XB(int a,int B) :XA(A) ,y(B) {}
C.XB::XB(int a,int B) :x(A) ,XB(B) {}
D.XB::XB(int a,int B) :XA(A) ,XB(B) {}
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