有如下类声明: class XA{ int X; public: XA(int n){x=n;} }; class XB:publicXA{ 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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