成员初始化表的执行顺序与顺写顺序无关

#include<bits/stdc++.h>  
using namespace std;  
class Student
{
  int age;
  int year;
  int birthYear;
  public:Student(int,int);   
};  
Student::Student(int x ,int y): year(x), birthYear(y),age(year - birthYear) 
{
  cout<<"age = "<<age<<endl;
  cout<<"year = "<<year<<endl;
  cout<<"birthYear = "<<birthYear<<endl;
  /*
  age = 0         // 运行结果age这里为0，因为按照构造函数的顺序，
          // age在上面，应该是age先初始化，所以age(year-birthYear)先运行，
          // 但是这个时候，year，birthYear都还没有初始化，默认为0，所以age最后为0
  year = 2014
  birthYear = 1976
  */
}
int main()
{
    Student* p = new Student (2014,1976);
    delete p;   
    return 0;
}

#include<bits/stdc++.h>  
using namespace std;  
class Student
{
  int year;
  int birthYear;
  int age;
  public:Student(int,int);   
};  
Student::Student(int x ,int y): year(x), birthYear(y),age(year - birthYear) 
{
  cout<<"age = "<<age<<endl;
  cout<<"year = "<<year<<endl;
  cout<<"birthYear = "<<birthYear<<endl;
}
int main()
{
    Student* p = new Student (2014,1976);
    delete p;   
    return 0;
}