OJ:析构函数实现多态
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2022-04-02 23:40:42
Description 下面程序的输出结果是: destructor B destructor A 请完整写出 class A。 限制条件:不得为 class A 编写构造函数。 ~~~~ include using namespace std; class A { // Your Code Her ......
Description
下面程序的输出结果是:
destructor B
destructor A
请完整写出 class A。 限制条件:不得为 class A 编写构造函数。
#include <iostream> using namespace std; class A { // Your Code Here }; class B:public A { public: ~B() { cout << "destructor B" << endl; } }; int main() { A * pa; pa = new B; delete pa; return 0; }
实现代码
#include <iostream> using namespace std; class A { public: virtual ~A() { cout << "destructor A" << endl; } }; class B:public A { public: ~B() { cout << "destructor B" << endl; } }; int main() { A * pa; pa = new B; delete pa; return 0; }