delete p究竟把p怎么了?是删除p吗?是改变p的指向吗?一切答案尽在下面的程序中:(C中的free与C++中的delete类似.)
- #include<iostream>
- using namespace std;
- int main()
- {
- int *p = new int;
- cout << "random *p: " <<*p << endl;
-
- *p = 10;
- cout << "the address of p: " << &p << endl;
- cout << "the value of p: " << p << endl;
- cout << "the value of *p : " << *p << endl;
- delete p;
-
- cout << endl;
-
- cout << "---After executing (delete p;)---" << endl;
- cout << endl;
- cout << "the address of p: " << &p << endl;
- cout << "the value of p: " << p << endl;
- cout << "the value of *p: " << *p << endl << endl;
-
- return 0;
- }
结果为:
random *p: -842150451
the address of p: 0012FF7C
the value of p: 00381F28
the value of *p : 10
---After executing (delete p;)---
the address of p: 0012FF7C
the value of p: 00381F28
the value of *p: -572662307
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