有如下类声明: classXA( intX; public: XA(intn){x=n;} }; classXB:publicXA{ inty; public: XB(inta,intb); ]; 在构造函数XB的下列定义中,正确的是( )。A.XB::XB(inta,intb):x(a),y(b){)B.XB::XB(inta,intb):XA(a),y(b){)C.XB::XB(inta,intb):x(a),XB(b)(}D.XB::XB(inta,intb):XA(a),XB(b){)

有如下类声明: classXA( intX; public: XA(intn){x=n;} }; classXB:publicXA{ inty; public: XB(inta,intb); ]; 在构造函数XB的下列定义中,正确的是( )。

A.XB::XB(inta,intb):x(a),y(b){)

B.XB::XB(inta,intb):XA(a),y(b){)

C.XB::XB(inta,intb):x(a),XB(b)(}

D.XB::XB(inta,intb):XA(a),XB(b){)


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