20200104-指针

1. #include "stdafx.h"

2. #include "iostream"

3. #include "cstring"

4. #include "string"

5. using namespace std;

6. int main()

7. {

8.   //第一组代码

9.   int updates=6;

10.   int *pt=&updates;

11.   cout<<"pt= "<<pt<<endl;

12.   cout<<"*pt= "<<*pt<<endl;

13.   *pt+=1;

14.   cout<<"加1后*p=t "<<*pt<<endl;

15.   cout<<"加1后updates= "<<updates<<endl;

16.   //第二组代码

17.   int nights=1001;

18.   int *pt1=new int;

19.   cout<<"*pt1="<<*pt1<<endl;

20.   *pt1=1001;

21.   cout<<&nights<<endl;

22.   cout<<pt1<<endl;

23.  

24.   cout<<sizeof(*pt1)<<endl;

25.   double *pt2=new double;

26.   *pt2=10.0;

27.  

28.   cout<<sizeof(*pt2)<<endl;

29.   cout<<pt2<<endl;

30. }