有如下的程序;include include using namespace std;class MyString{public 有如下的程序; #include <ctring> #include <iostream> using namespace std; class MyString { public: MyString(const char *s); ~MyString() {delete[]data;} protected: unsigned len; char *data; }; MyString:: MyString (const char *s) { len=strlen(s); data=new char[len+1]; strcpy(data,s); } int main() { MyString a("C++ Programing"); MyString b(a); return 0; } 在运行上面的程序时出错,出错的原因是______ 。A.构造函数的实参不允许是本类的对象B.没有定义实现深层复制(深拷贝)的拷贝构造函数C.构造对象a时实参与形参类型不符D.系统不能生成缺省的拷贝构造函数
有如下的程序;include include using namespace std;class MyString{public
有如下的程序; #include <ctring> #include <iostream> using namespace std; class MyString { public: MyString(const char *s); ~MyString() {delete[]data;} protected: unsigned len; char *data; }; MyString:: MyString (const char *s) { len=strlen(s); data=new char[len+1]; strcpy(data,s); } int main() { MyString a("C++ Programing"); MyString b(a); return 0; } 在运行上面的程序时出错,出错的原因是______ 。
A.构造函数的实参不允许是本类的对象
B.没有定义实现深层复制(深拷贝)的拷贝构造函数
C.构造对象a时实参与形参类型不符
D.系统不能生成缺省的拷贝构造函数
相关考题:
有如下程序 include using namespace std; class Base { protected: 有如下程序 #include <iostream> using namespace std; class Base { protected: Base( ){cout<<'A'; } Base(char c) { cout<<c; } }; class Derived: public Base { public: Derived(char c){ cout<<c; } }; int main( ){ Derived d1 ('B'); return 0; } 执行这个程序屏幕上将显示输出A.BB.BAC.ABD.BB
有如下程序: include using namespace std; class Sample{ public: 有如下程序: #include<iostream> using namespace std; class Sample{ public: Sample()<) ~Sample(){cout<<'*';} }; int main(){ Sample temp[2],*pTemp[2]; return 0; } 执行这个程序输出星号(*)的个数为( )。A.1B.2C.3D.4
有如下程序: include using namespace std; class A { public: virtual void f(){cout 有如下程序:include<iostream>using namespace std;class A{public:virtual void f(){cout<<"1";}};class B:public A{public:B (){cout<<"2";}};class C:public B{public:virtual void f(){B::f();cout<<"3";}};int main(){A aa,*p;B bb;C cc;p=cc;p->f();return 0;}执行上面程序的输出是______。
有如下程序: include using namespace std; class Base { public: 有如下程序: #include <iostream> using namespace std; class Base { public: Base(int x=0) { cout<<x; } } class Derived: public Base{ public: Derived(int x=0) { cout<<x; } private: Base val; }; int main() { Derived d(1); return 0; }程序的输出结果是A.0B.1C.1D.1
程序的输出结果是【 】。 include using namespace std; class A{ int x; public: A(int 程序的输出结果是【 】。include <iostream>using namespace std;class A{int x;public:A(int x=1):x(x){cout<<x;}};void main(){A a,b(2),c(3);}
有下列程序:include using namespace std; class TestClass1 { public: TestClass1(){ 有下列程序:include<iostream>using namespace std;class TestClass1{public:TestClass1(){cout<<"A";}};class TestClass2<public:TestClass2(){cout<<"B";}};class TestClass3:public TestClass1{TestClass2 b;
以下程序的执行结果为______。include using namespace std; class base { public: vir 以下程序的执行结果为______。include<iostream>using namespace std;class base{public:virtual void who(){cout<<"base class"<<endl;}};class derivel:public base{public:void who(){cout<<"d
有如下程序:include using namespace std;class Base{public:Base(){cout 有如下程序:#include <iostream>using namespace std;class Base{ public: Base(){cout<<"BB"; f(); } Void f(){cout<<"Bf"; }};class Derived: public Base{ public: Derived() { cout<<"DD"; } void f() { cout<<"Df"; }};int main() { Derived d; return 0; }执行上面的程序将输出( )。A.BBBfDDB.BBDfDDDfC.DDD.DDBBBf
有如下程序: include using namespace std; class A { public: 有如下程序: #include<iostream> using namespace std; class A { public: A(){cout<<"A";} }; class B<public:B(){cout<<"B";)); class C:public A { B b; public: C(){cout<<"C";} }; int main(){Cobj;retum 0;} 执行后的输出结果是A.CBAB.BACC.ACBD.ABC
有如下程序: include using namespace std; class BASE { public 有如下程序: #include<iostream> using namespace std; class BASE { public: ~BASE(){cout<<"BASE";} }; class DERIVED:public BASE { public: ~DERIVED(){cout<<"DERIVED";} }; int main(){DERIVEDx;retum 0;} 执行后的输出结果是A.BASEB.DERIVEDC.BASEDERIVEDD.DERIVEDBASE
有以下程序:include using namespace std; class Base { public: Base() { K=0; } int 有以下程序:include<iostream>using namespace std;class Base{public:Base(){K=0;}int x;};class Derivedl:virtual public Base{public:Derivedl(){x=10;}};class Derived2:virtua1 public Base
有如下的程序:include include using namespace std;class MyString{p 有如下的程序: #include <cstring.h> #include <iostream.h> using namespace std; class MyString { public: MyString(const char*s); ~MyString () {delete [] data;} protected: unsigned len; char*data; }; MyString::MyString(const char *s) { len=strlen (s); data=new char[len+1]; strcpy (data,s); } int main () { MyString a("C++ Programing"); MyString b(a); return 0; } 在运行上面的程序时出错,出错的原因是A.构造函数的实参不允许是本类的对象B.没有定义实现深层复制(深拷贝)的复制构造函数C.构造对象a时实参与形参类型不符D.系统不能生成默认的复制构造函数
有如下程序:include using namespace std;class BASE{public:~BASE(){cout 有如下程序: #include <iostream> using namespace std; class BASE{ public: ~BASE(){cout<<"BASE";} }; class DERIVED:public BASE{ public: ~DERIVED(){cout<<"DERIVED";} }; int main(){DERIVED x;return 0;} 执行后的输出结果是A.BASEB.DERIVEDC.BASEDERIVEDD.DERIVEDBASE
有如下程序:includeusing namespace std;class BASE{public:~BASE( ){cout 有如下程序: #include<iostream> using namespace std; class BASE{ public: ~BASE( ){cout<<"BASE";} }; class DERIVED:public BASE{ public: ~DERIVED( ){cout<<"DERIVED";} }; int main( ){DERIVED x;return 0;} 程序的输出结果是A.BASEB.DERIVEDC.BASEDERIVEDD.DERIVEDBASE
有如下程序: include using namespace std; class PARENT { public: PARENT() { cout 有如下程序:include <iostream>using namespace std;class PARENT{public:PARENT() { cout <<"PARENT"; }};class SON : public PARENT{public:SON() {cout << "SON"; }};int main(){SON son;PARENT *p;p = son;return 0;}执行上面程序的输出是______。
有如下程序: include using namespace std; class A { public: A(){cout 有如下程序: #include<iostream> using namespace std; class A { public: A(){cout<<"A";} ~A(){cout<<"~A";) }; class B:public A { A*p; public: B(){cout<<"B";p=new A;} ~B(){cout<<"~B";delete p;} }; int main() { B obj; return 0; } 执行这个程序的输出结果是( )。A.BAA~A~B~AB.ABA~B~A~AC.BAA~B~A~AD.ABA~A~B~A
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有如下程序:include using namespace std;Class x{protected: int a;public: x() {a= 有如下程序: #include <iostream> using namespace std; Class x { protected: int a; public: x() { a=1; } }; class x1 : virtual public x { public: x1() { a+=1; cout<<A.1B.123C.242D.244
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有如下程序:include using namespace std;class A{public:A(){cout 有如下程序: #include <iostream> using namespace std; class A { public: A(){cout<<"A";} }; class B {public:B(){cout<<"B";} }; class C:public A { B b; public:C(){cout<<"C";} }; int main(){C obj;return 0;} 执行后的输出结果是( )。A.CBAB.BACC.ACBD.ABC
请在如下程序中的空格处填写正确的语句: include using namespace std; class Base { 请在如下程序中的空格处填写正确的语句:include <iostream>using namespace std;class Base {public:void fun() {cout<<"Base fun"<<endl; }};class Derived: public Base {public:void fun() {【 】; //调用基类的函数fun()cout<<"Derived fun "<<endl;}};