标签：析构函数 静态 target 结果 ret virtual ppa div include
1.
class CParent { public: virtual void Intro() { printf( "I‘m a Parent, " ); Hobby(); } virtual void Hobby() { printf( "I like football!" ); }}; class CChild : public CParent { public: virtual void Intro() { printf( "I‘m a Child, " ); Hobby(); } virtual void Hobby() { printf( "I like basketball!\n" ); }}; int main( void ){ CChild *pChild = new CChild(); CParent *pParent = (CParent *) pChild; pParent->Intro(); return(0);}
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解析：
上行转换 但是指针指向没变 然后调用子类重载 所以答案是 Im a Child I like footbal！
2.
解析： 类静态成员 在外面初始化 要指定是哪个类 及 Fred：： 同时省略static关键字
3.
class Test{public: int a; int b; virtual void fun() {} Test(int temp1 = 0, int temp2 = 0) { a=temp1 ; b=temp2 ; } int getA() { return a; } int getB() { return b; }};int main(){ Test obj(5, 10); // Changing a and b int* pInt = (int*)&obj; *(pInt+0) = 100; *(pInt+1) = 200; cout << "a = " << obj.getA() << endl; cout << "b = " << obj.getB() << endl; return 0;}
4.
链接：https://www.nowcoder.com/questionTerminal/ac7f182a41dd4c52b8895fcaf151e92d
来源：牛客网
class A { public: A() { } ~A() { cout<<"~A"<<endl; } }; class B:public A { public: B(A &a):_a(a) { } ~B() { cout<<"~B"<<endl; } private: A _a; }; int main(void) { A a; //很简单，定义a的时候调用了一次构造函数 B b(a); } |
# include <iostream>using namespace std;class A { public: A() { cout<<"create A"<<endl; } A(const A& other){ cout<<"copy A"<<endl;} //复制构造函数 ~A() { cout<<"~A"<<endl; } }; class C{public: C() { cout<<"create C"<<endl; } C(const A& other){ cout<<"copy C"<<endl;} //复制构造函数 ~C() { cout<<"~C"<<endl; } };class B:public A { public: B() { cout<<"create B"<<endl; } ~B() { cout<<"~B"<<endl; } private: C _a; }; int main(void) { B b; cout<<"------------------------"<<endl;} |
create A
create C
create B
------------------------
~B
~C
~A
标签：析构函数 静态 target 结果 ret virtual ppa div include
原文地址：https://www.cnblogs.com/MengX/p/12316077.html
