MafiaGeek

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
#define NAMESIZ 32 /*size of name array */
 
 
typedef struct object
{
	char name[NAMESIZ];
	int number;
	void (*print)(struct object*); /*function pointer declarations*/
	int (*getNumber)(struct object*);
} Object;
 
 
void object_print(Object* this) /* functions which do operations on the Object structure */
{
	printf("%s\n", this->name);
}
 
int object_getNumber(Object *this)
{
	return this->number;
}
 
Object * object_create(char* name, int number)	/*creates a new Object and returns a Object pointer*/
{
	Object * obj = NULL;
	if((obj = malloc(sizeof(Object))) != NULL)
	{
		strncpy(obj->name, name, NAMESIZ);
		obj->print = &object_print;	/*set function pointer for print*/
		obj->getNumber = &object_getNumber;	/*set function pointer for getNumber*/
		obj->number = number;
	}
	return obj;
}
 
void object_delete(Object ** obj)	/*free a Object from memory and sets the Object pointer to NULL*/
{
	free(*obj);
	*obj = NULL;
}
 
int main()
{
	Object * obj = NULL;
	if((obj = object_create("My Name", 70)) != NULL)
	{
		(*obj->print)(obj);	/*call void function print. Also we could make a operation on the object by object_print(obj); */
		printf("%d\n", (*obj->getNumber)(obj)); /*call int getNumber function*/
		object_delete(&obj);
	}
#ifdef WIN32
	system("pause");
#endif
	return 0;
}