以下程序的执行结果是______。 #include<iostream.h> class base { public: virtual void who( ){cout<<"base class"<<endl:} }; class derrvel:public base { public: void who( ){cout<<"derivel class"<<endl:} }; class derive2;public base { public: void who( ) {cout<<"derive2 class"<<endl;} }; void main( ) { base obj1,*P; derive1 obj2; derive2 obj3: p=&obj1; p->who( ); p=&obj2: p->who( ); p=&obj3; p->who( ); }

题库:计算机等级考试 类型:填空题 时间:2017-07-03 17:19:13 免费下载:《填空》Word试卷

以下程序的执行结果是______。 #include<iostream.h> class base { public: virtual void who( ){cout<<"base class"<<endl:} }; class derrvel:public base { public: void who( ){cout<<"derivel class"<<endl:} }; class derive2;public base { public: void who( ) {cout<<"derive2 class"<<endl;} }; void main( ) { base obj1,*P; derive1 obj2; derive2 obj3: p=&obj1; p->who( ); p=&obj2: p->who( ); p=&obj3; p->who( ); }

以下程序的执行结果是______。
   #include<iostream.h>
   class base
   { 
   public:

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