#include using namespace std; class A { public:A(){cout
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![#include using namespace std; class A { public:A(){cout](/uploads/image/z/11764541-29-1.jpg?t=%23include+using+namespace+std%3B+class+A+%7B+public%3AA%28%29%7Bcout)
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#include using namespace std; class A { public:A(){cout
#include using namespace std; class A { public:A(){cout
#include using namespace std; class A { public:A(){cout
n的地址的确变了,但是n的类型没变,依然是A*,故可以调用b方法