有如下类定义:classXX{intxx;public:XX():xx(0){cout<<'A';}XX(intn):xx(n){cout<<'B';}};classYY:publicXX{intyy;public:YY():yy(0){cout<
A. YYy1(0,0);
B. YYy2(1);
C. YYy3(0);
D. YYy4;
如下程序运行时的输出结果是()。#includeusingnamespacestd;classBase{public:intm,n;Base(inti,intj):m(i),n(j){}};classDerived:publicBase{public:intm,k;Derived(inti,intj):Base(i,j),m(i+1),k(j+1){}};intmain(){Derivedd(1,5);cout<