一道C++基础题

显示全部楼层 · 2008-9-5 15:03:09

读程序，写出程序的执行结果。
class A{
public:

A(){cout<<"A'constructor is called"<<endl;}

~A(){cout<<"A'destructor is called"<<endl;}
};
class B{
public:

B(){cout<<"B'constructor is called"<<endl;}

~B(){cout<<"B'destructor is called"<<endl;}
};
class C : public B{

A a;
public:

C():B(),a()

{
cout<<"C'constructor is called"<<endl;

}

~C(){cout<<"C'destructor is called"<<endl;}
};
void main()
{

C c();
}
在线等.高分赏答对就有分

千问 · 2008-9-5 15:03:09

主函数里面的C c(),应该改成C c; 因为没有参数，系统会自动调用构造函数的不应该加括号，还有要注意加#include头文件，下面是运行结果B'constructor is calledA'constructor is calledC'constructor is calledC'destructor is calledA'destructor is calledB'destructor is called...

千问 · 2008-9-5 15:03:09

cout<<"B'constructor is called"<<endl;cout<<"A'constructor is called"<<endl; cout<<"C'constructor is called"<<endl;cout<<"C'destructor is called"<<endl;cout<<"A'destructor ...