C + +: The member variable declaration order of the class is the same as that of the initialization order

The default initialization order for class members is in the order of declaration, and if you initialize a member variable with an initialization list, you must follow the declaration order of the member variable;

Otherwise, when alternating between variables, an uninitialized variable is created to assign the other variable;

GCC also emits a warning, such as: ' Class::m_xxx ' will be initialized after [-wreorder]

Code:

* * * * * BInsertSort.cpp * *  Created on:2014 April 15 
 *      author:spike/
      
#include < iostream>  
#include <string>  
      
using namespace std;  
      
Class Base {  
private:  
    int m_i;  
    int m_j;  
Public:  
    Base (int i): M_j (i), m_i (M_j) {}  
    base (): M_j (0), m_i (M_j) {}  
    int get_i () {return m_i;}  
    int Get_j () {return m_j;}  
};  
      
int main () {  
    base obj ();  
    Std::cout << obj.get_i () << Std::endl  
            << obj.get_j () << Std::endl;  
    return 0;  
}

Output:

4202398  
98

Author: csdn Blog spike_king

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