C-Language object-oriented programming

#include  <stdio.h> #include  <stdlib.h>/* * *   1.   Simple implementation of simulation virtual function table implementation of C language object-oriented design  *   2.   to implement:   function registration call  *   3.              File Implementation function Registration call  *///Package typedef  struct _shape shape;//Simulation virtual function Table struct shapeclass{    void  (*construct) ( Shape* self)  //Constructor     void  (*destroy) (shape* self);    //destructor     void  (*draw) (shape* self);       // Handling Functions   };struct _Shape{   struct ShapeClass *kclass;    int x,y;};/ /constructor Void shape_construct (shape* self) {q         self- >x = 0;     self->y = 0;      printf ("ShapE construct\n ");} destructor Void shape_destroy (shape* self) {    printf ("shape destroy\n");     //to-do destroy self}void shape_draw (shape* self) {     printf ("draw:%d,%d\n", self->x,self->y);     //to-do draw self}//Declaration _ shape_class,  is the Register virtual function table Struct shapeclass _shape_class={    shape_construct, The   //function name is the address of the function     Shape_destroy,    Shape_draw,}; Shape* newshape () {    shape* s =  (shape*) malloc (sizeof (Shape));     s->kclass = &_shape_class;    s->kclass-> construct (s);     return s;} Void deleteshape (Shape* shape) {   shape->kclass->destroy (Shape);    free (shape);} Int main () {&NBSP;&NBSP;&NBSP;&NBSP;SHAPE*&NBSP;SHAPE&NBSp;= newshape ();     shape->kclass->draw (Shape);     Deleteshape (shape);}

C-Language object-oriented programming