关于嵌套结构的问题 [英] Question about nested structures

问题描述

1。我读了很多教程，我理解嵌套结构的方法，但我无法理解

为什么我们使用嵌套结构？

1. I read many tutorials i understand the method of nested structures but i can not understand
why we use nested structures?

推荐答案

因为成员作为一个简单的变量，结构可以更复杂，例如 struct date ：

Because the member of a structure can be more complex as a simlple variable, for example like struct date:

struct Employee
{
   char ename[20];
   int ssn;
   float salary;
   struct date
       {
       int date;
       int month;
       int year;
       }doj;
}emp;

以下C风格：

The following C style:

typedef struct {
  int x, y;
} point, * ppoint;

typedef struct {
  point; // a "derivation" :)
  int r;
} circle, * pcircle;

typedef struct {
  point c; // an aggregation :)
  int r;
} circleEx, * pcircleEx;

...将与C ++风格相等:)：

...would be "equal" to the C++ style :) :

class CPoint
{
  int x, y;

public:
  //...
};

class CCircle : public CPoint
{
  int r;

public:
  //...
};

class CCircleEx
{
  CPoint c;
  int r;

public:
  //...
};

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