Question about nested structures

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

Posted 7-Mar-13 2:20am

ALIWAZ

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Leo Chapiro · Answer 1 · 2013-03-07T02:36:00

Solution 1

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

C#

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

Posted 7-Mar-13 2:36am

Leo Chapiro

Updated 7-Mar-13 2:38am

v3

Eugen Podsypalnikov · Answer 2 · 2013-03-07T02:47:00

Solution 2

The following C style:

C++

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;

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

C++

class CPoint
{
  int x, y;

public:
  //...
};

class CCircle : public CPoint
{
  int r;

public:
  //...
};

class CCircleEx
{
  CPoint c;
  int r;

public:
  //...
};

Posted 7-Mar-13 2:47am

Eugen Podsypalnikov

Updated 7-Mar-13 3:16am

v2

Comments

Leo Chapiro 7-Mar-13 9:10am

Good point, actually shoud the question means "Why we use nested structures in C" :)

Eugen Podsypalnikov 7-Mar-13 9:21am

Very likely... :)
Thank you !