指针函数

红莲教主

1. #include <iostream>
   
2. #include <string>
   
3. 
   
4. using std::cout ;
   
5. using std::endl ;
   
6. using std::string ;
   
7. 
   
8. int* newInt(int value);
   
9. double* newDouble(double value);
   
10. 
    
11. int main()
    
12. {
    
13.     int* pInt = newInt(500);
    
14. 
    
15.     double* pDouble = newDouble(33.33);
    
16. 
    
17.     cout<<"*pInt = "<<*pInt <<endl; //正确，堆内存只有使用delete删除
    
18. 
    
19.     cout<<"pDouble = "<<*pDouble<<endl; //错误，局部变量已经失效
    
20. 
    
21.     delete pInt ;
    
22.     pInt = NULL ;
    
23. 
    
24.     return 0;
    
25. }
    
26. 
    
27. 
    
28. int* newInt(int value)
    
29. {
    
30.     int* pInt = new int ;
    
31.     *pInt = value ;
    
32.     return pInt ;
    
33. }
    
34. 
    
35. double* newDouble(double value)
    
36. {
    
37.     double num = value;
    
38. 
    
39.     return &num ;
    
40. }
    

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