简单工厂模式(个人笔记)-优快云博客

文章展示了如何在C语言中模拟类和对象的概念，通过结构体定义Animal类，并使用指针函数实现方法。使用头插法创建和管理一个包含不同动物（如Dog、Cat和Person）的链表，通过链表中的FindName函数查找并执行特定动物的行为方法。

一、类和对象

1、类：是一种用户自定义的数据类型，也称为类类型（结构体）

2、对象：类的一种具象

//模型
struct Animal       //类
    { 
         int age;       //成员属性
         int sex;

         void (*peat)();     //成员方法
         void (*pbeat)();
    }


void dogEat()
  {
      ;
  }


void dogbeat()
  {
      ;
  }



方法一：
int main()
   {
       struct  Animal  dog;    //对象
       
       dog.peat = dogEat;    //应用方式 
       dog.pbeat = dogbeat;
  
       dog.peat();          //调用函数方法
       dog.pbeat();
   }



方法二：
int main()
   {
       struct Animal dog = {
                               .peat = dogEat;
                               .pbeat = dogpbeat;
                           };     

       dog.peat();         //调用函数
       dog.pbeat();
   }

Animal.h

cat.c

dog.c

person.c

findname.c

main.c

#include <stdio.h>
#include <string.h>



struct Animal         //类
	{
	    char name[64]; 
	    int  age;         //成员属性
	    char sex[128];   
		
        void (*peat)();   //成员方法
		void (*pbeat)();

		struct Animal * next;
	};

struct Animal * putdogInLink(struct Animal * head);
struct Animal * putCatInLink(struct Animal * head);
struct Animal * putpersonInLink(struct Animal * head);
struct Animal * FindName(char *name,struct Animal * head);

//用头插法创建链表
//cat
#include "Animal.h"



void catEat()
   {
       printf("cat eat fish\n");
   }


void catbeat()
   {
       printf("tickle your dick\n");
   }

struct Animal cat = {
                        .name  = "Garfield",
                        .peat  = catEat,
						.pbeat = catbeat
                    };


struct Animal * putCatInLink(struct Animal * head)
	 {
		  if(head == NULL)
		   {
		       head = &cat;
			   return head;
		   }
		  else
		  	{
		  	    cat.next = head;
				head = &cat;
		  	}
		  return head;
	 }

//用头插法创建链表
//dog

#include "Animal.h"



void dogEat()
   {
       printf("dogs eat turds\n");
   }


void dogbeat()
   {
       printf("Bite your dick\n");
   }

struct Animal dog = {
                        .name  = "Odie",
                        .peat  = dogEat,
						.pbeat = dogbeat
                    };


struct Animal * putdogInLink(struct Animal * head)
	 {
		  if(head == NULL)
		   {
		       head = &dog;
			   return head;
		   }
		  else
		  	{
		  	    dog.next = head;
				head = &dog;
		  	}
		  return head;
	 }

//用头插法创建链表
//person
#include "Animal.h"



void personEat()
   {
       printf("person eat rich\n");
   }


void personbeat()
   {
       printf("pull your dick\n");
   }

struct Animal person = {
                        .name  = "Jon",
                        .peat  = personEat,
						.pbeat = personbeat
                    };


struct Animal * putpersonInLink(struct Animal * head)
	 {
		  if(head == NULL)
		   {
		       head = &person;
			   return head;
		   }
		  else
		  	{
		  	    person.next = head;
				head = &person;
		  	}
		  return head;
	 }

#include "Animal.h"

//查找函数findname


struct Animal * FindName(char *name,struct Animal * head)
	{

     struct Animal *tmp = head;
	
	     if(head == NULL)
	      {
	          printf("NULL\n");
			  return NULL;
	      }
		 else 
		  {
		       while(tmp != NULL)
			   	 {
			   	     if(strcmp(tmp->name,name) == 0)
					 	{ 
							return tmp;
					    }
					 tmp = tmp->next;
			   	 }
			   return NULL;
		  }
	}

#include "Animal.h"
//main




int main()
  {
    char buf[128] = {"\0"};
    struct Animal *tmp;
  
    struct Animal * head = NULL;     //实现链表
	head = putdogInLink(head);
	head = putCatInLink(head);
	head = putpersonInLink(head);

	printf("please input Odie、Jon、Garfield\n");
	scanf("%s",buf);


	while(1)
		{	
	        tmp = FindName(buf,head);
	        if(tmp != NULL)
             {
	             tmp->peat();      //调用相应名字下的功能
	             tmp->pbeat();
             }
			memset(buf,'\0',sizeof(buf));
	    }
		
	
      return 0;
  }