class One { public One foo（） { return this； } } class Two extends One { public One foo（） { return this； } } class Three extends Two { // insert method here } Which two methods， inserted individually， correctly complete the Three class？（）
Lucy and Lily is both in Class One.()
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有如下程序: include using namespace std; class ONE { public: virtual void f() {有如下程序：include ＜iostream＞using namespace std;class ONE{public:virtual void f() { cout ＜＜ "1"; }};class TWO: public ONE{public:TWO() { cout ＜＜ "2"; }};class THREE: public TWO{public:virtual void f() {TWO::f(); cout ＜＜ "3"; }};int main(){ONE aa, *p;TWO bb;THREE cc;p=&cc;P-＞f();return 0;}执行上面程序的输出是【 】。
one of the distinctive features about the british class system is that it has also retained a hereditary aristocracy. ()
类clasg one在声明func成员函数时发生错误，出错原因是______。class oneprivate:int a;public:void func(two&);};class two{private:int b;friend vold one::func(two&);};void one::func(two&r){a=r.b;}
有如下程序：#includeusing narnespace std；class ONE{int e；public：ONE()：c(O){cout<<1；)ONE(int n)：c(13){cout<<2；}}；class TWO{ONE oriel；ONE one2，public：TWO(int m)：one2(m){cout<<3；}}；int main(){TWO t(4)；return O；}运行时的输出结果是A．3B．23C．123D．213
有下列程序:includeusing namespace std;class ONE{ public:virtual void f(){COUt有下列程序：include＜iostream＞using namespace std;class ONE{public:virtual void f(){COUt＜＜"1";}};c1assTWO:public ONE{public:TWO(){cout＜＜"2";}};class THREE:public TWO{pub
类class one 在声明func 成员函数时发生错误，出错原因是【 】。Class one{private:int a;public:void func(two& )};class two{private:int b;friend void one: :func(two & );};void one: : func(two& r)a=r.b;}
