题目内容

写结果。#includeusingnamespacestd;classB0{public:virtualvoiddisplay()=0;};classB1:publicB0{public:voiddisplay(){cout<<"B1"；}};classD1:publicB1{public:voiddisplay(){cout<<"D1";}};voidfun(B0ptr){ptr->display();}intmain(){B0p;B1b1;D1d1;p=&b1;fun(p);p=&d1;fun(p);return 0；}

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写结果classA{intm;public:A(inta=0){m=a;}virtualvoidf(){cout<f();p->g();}

写结果。classA{public:A(){}virtualvoidfunc(){cout<<"DA";}~A(){func();}};classB:publicA{public:B(){}voidfunc(){cout<<"DB";}~B(){func();}};intmain(){B b；A &a=b；return 0；}

写结果。classB{public:B(inti){b=i+50;show()；}B(){}virtualvoidshow(){cout<<"B"<

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