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下面程序的结果是 ______。includeclass A{ public:virtual voidfun()=0{};};class
下面程序的结果是 ______。 #include＜iostream.h＞ class A{ public: virtual void fun()=0{}; }; class B:public A{ public: void fun () {cout＜＜ "new file" ;} }; class C: public A{ public: void fun (){cout＜＜"open file"＜＜ " " } }; class D: public A{ public: void fun () {cout＜＜ "save file\n" ;} }; void main() { A a,*p; B b; C c; D d; p=&c; p-＞fun (); p=&b; p-＞fun (); p=&d; p-＞fun(); }
A．new file open file save file
B．new file new file new file
C．编译出错
D．open file new file save file
参考答案
更多 “ 下面程序的结果是 ______。includeclass A{ public:virtual voidfun()=0{};};class 下面程序的结果是 ______。 #include＜iostream.h＞ class A{ public: virtual void fun()=0{}; }; class B:public A{ public: void fun () {cout＜＜ "new file" ;} }; class C: public A{ public: void fun (){cout＜＜"open file"＜＜ " " } }; class D: public A{ public: void fun () {cout＜＜ "save file\n" ;} }; void main() { A a,*p; B b; C c; D d; p=c; p-＞fun (); p=b; p-＞fun (); p=d; p-＞fun(); }A．new file open file save fileB．new file new file new fileC．编译出错D．open file new file save file ” 相关考题
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有如下程序: include using namespaee std; class ONE{ public: virtual void f
有如下程序：include ＜iostream＞using namespaee std；class ONE{public：virtual void f( ){cout＜＜"1"；}}；class TWO：public ONE{public：TWO( )1 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；}程序的输出结果是______。
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若有以下程序: include using namespace std;class Base{public:Base ( ){x=0;}int x
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下面程序的运行结果是includeclass base{protected: int a;public: base(){cout
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下列程序的运行结果是______。 include class Base { public: virtual void func(int
下列程序的运行结果是______。include＜iostream.h＞class Base{public:virtual void func(int i){cout＜＜"class Base:"＜＜i＜＜end1;)};class Derived: public Base{public:void func(double d){cout＜＜"class Derived:"＜＜d＜＜endl;}};void main( ){Base a,*p=a;Derived b;p=b;(*p).func(3.3);}
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