有如下程序:includeusing namespaee std;class Demo{public:Demo( ){cout 有如下程序: #include<iostream> using namespaee std; class Demo{ public: Demo( ){cout<<"default constructor\n";} Demo(const Demo &x){cout<<"copy constructor\n";} }; Derno userCore(DemoB) {Demo c(B) ;return c;} int main( ){ Demo a,d; cout<<"calling userCode( )\n"; d=userCode(A) ; return 0; } 执行上面程序的过程中,构造函数Demo( )和Demo(const Demo x)被调用的次数分别为A.1和1B.1和2C.2和3D.2和4

有如下程序:includeusing namespaee std;class Demo{public:Demo( ){cout<<"default

有如下程序: #include<iostream> using namespaee std; class Demo{ public: Demo( ){cout<<"default constructor\n";} Demo(const Demo &x){cout<<"copy constructor\n";} }; Derno userCore(DemoB) {Demo c(B) ;return c;} int main( ){ Demo a,d; cout<<"calling userCode( )\n"; d=userCode(A) ; return 0; } 执行上面程序的过程中,构造函数Demo( )和Demo(const Demo &x)被调用的次数分别为

A.1和1

B.1和2

C.2和3

D.2和4


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有如下程序: include using namespace std; class Demo 有如下程序: #include<iostream> using namespace std; class Demo { public: Demo(){ cout<<"default constructor\n";} Demo(const Demo x){ cout<<"copy constructor\n":} }; Demo userCode(Demo b){DemoC(b);return c;} int main() { Demo a,d; cout<<"calling userCode()\n"; d=userCode(a); return 0; } 执行上面程序的过程中,构造函数Demo()和Demo(const Demo x)被调用的次数分别是A.1和1B.1和2C.2和3D.2和4

有如下程序:includeUsing namespace std;Class Demo{public:Demo(){cout 有如下程序: #include<iostream.h> Using namespace std; Class Demo { public: Demo(){ cout<<“default constructor\n”;} Demo(const Demo x){ cont<<“copy constructor\n”;} }; Demo usercode(Demob){Demo c(b);return c;} int main() {A.1和1B.1和2C.2和3D.2和4

有如下程序: include using namespace std; class Demo { public: 有如下程序: #include<iostream.h> using namespace std; class Demo { public: Demo(){ cout<<"default constructor\n";} Demo(const Demo X){ cont<<"copy constructor\n";} }; Demo userCode (Demo b){Demo c(b);return c;} int main() { Demo a,d; cout<<"calling userCode()\n"; d=userCode(a); return 0; } 执行上面程序的过程中,构造函数Demo()和Demo(const Demo x)被调用的次数分别是( )。A.1和1B.1和2C.2和3D.2和4

有如下程序:include using namespace std;class Demopublic:{ Demo () { cout 有如下程序: #include <iostream> using namespace std; class Demo public: { Demo () { cout << "default constructor\n"; } Demo (const Demo x){ cout << "copy constructor\"; } }; Demo userCode(Demo b){ Demo c(b);return c; } int main() { Demo a,d; cout<<"calling userCode()\n"; d=aserCode(a); return 0; }执行上面程序的过程中,构造函数Demo()和Demo(const Demo x)被调用的次数分别是 ______ 。A.1和1B.1和2C.2和3D.2和4

有如下程序:includeusing namespace std;classDemo{public: Demo(){cont 有如下程序: #include<iostream.h> using namespace std; class Demo { public: Demo(){ cont<<"default constructor\n";} Demo(const Demo x){ cont<<"copy constructor\n";} }; Demo userCode(Demo b){Demo c(b);return c;} int main() { Demo a,d; cout<<"calling userCode()\n"; d=userCode(a); return 0; } 执行上面程序的过程中,构造函数Demo()和Demo(const Demo x)被调用的次数分别是A.1和1B.1和2C.2和3D.2和4

有下列程序: include using namespace std; class Demo { public: Demo(){cout 有下列程序: #include<iostream.h> using namespace std; class Demo { public: Demo(){ cout<<"default constmctor\n";} Demo(const Demo x){ cont<<"copy constructor\n";} }; Demo userCode(Demo b){Demo c(b);return c;} intA.1和1B.1和2C.2和3D.2和4

设有如下程序: include using namespace std; class A { public:int i;display(){co 设有如下程序: #include <iostream> using namespace std; class A { public: int i; display() { cout<<"class A\n"; } }; class B { public: int i; display() { cout<<"class B\n"; } }; class C : public A, public B { int j; public: int i; show ( ) { j = i * i; display(); } }; int main() { C demo; demo.show(); return O; } 则主程序运行时将( )。A.因为变量i的重复定义而报错B.因为对象demo间接调用display()函数时产生二义性而报错C.因为类定义的语法错误而不能运行D.没有语法错误,能够正常输出结果

有以下程序:include using namespace std;class A{public: virtual void show() {cout 有以下程序:include <iostream>using namespace std;class A{public:virtual void show(){cout<<"A";}};class B : public A{public:void show(){cout << "B";}};void display( A * obj ){obj-> show();}int main ( ){A demol;B demo2;display( demol );display( demo2 );return 0;}执行后的输出结果为【 】。

设有如下程序:include class A{public:int i;display(){ cout 设有如下程序:#include <iostream. h>class A{public:int i;display(){ cout<<"class A\n"; }};class B{public:int i;display(){ cout<<"class B\n"; }};class C: public: A, public: B{int j;public:int i;show(){ j=i*i; display(); }};void main(){C demo;demo. show();}则主程序运行时,将( )。A.因为变量i的重复定义而报错B.因为对象demo间接调用display函数时产生歧义性而报错C.因为类定义的语法错误而不能运行D.没有语法错误,能够正常输出结果