코딩할때 포인터 없어도 됨.. 별 쓸대 없는걸로 힘빼지 말고 딸이나 함씩 치고 자라.


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

#define JOB_LEN 1
#define JOB_EQU 2
#define JOB_IND 3

typedef struct _fun_class{
      char *string;
      int job;
      int (*length)(struct _fun_class *);
      int (*equals)(struct _fun_class *, char*);
      int (*indexOf)(struct _fun_class *, char*);
      int (*whichJob)(struct _fun_class *, char*, int);
}_fun_class;

int length(_fun_class *me)
{
   if(me->string) return strlen(me->string);
   return 0;
}

int equals(_fun_class *me, char *tgt)
{
   if(me->string) return (strcmp(me->string, tgt))?0:1;
   return 0;
}

int indexOf(_fun_class *me, char *tgt)
{
   if(me->string){
      char *p;
      p = strstr(me->string, tgt);
      if(p) return (p-(me->string));
      else return -1;
   }
   return -1;
}

int whichJob(struct _fun_class *me, char*str, int job)
{
   if(job == JOB_LEN) return me->length(me);
   else if(job == JOB_EQU) return me->equals(me, str);
   else if(job == JOB_IND) return me->indexOf(me, str);
   return 0;
}

_fun_class *my_new_string(char *str)
{
   _fun_class *myString;

   myString = (_fun_class *)malloc(sizeof(_fun_class));

   myString->length = length;
   myString->equals = equals;
   myString->indexOf = indexOf;
   myString->whichJob = whichJob;
   myString->job = 0;

   if(str) myString->string = strdup(str);
   else myString->string = NULL;
}

void my_delete_string(_fun_class *myString)
{
   if(myString->string) free(myString->string);
   if(myString) free(myString);
}

int main()
{
   _fun_class *myString = NULL;

   myString = my_new_string("아버지가 방에 들어 가신다.");

   printf("str : %s\\n", myString->string);
   printf("length : %d\\n", myString->length(myString));
   printf("equals : %d\\n", myString->equals(myString, "아버지"));
   printf("equals : %d\\n", myString->equals(myString, "아버지가 방에 들어 가신다."));
   printf("indexOf : %d\\n", myString->indexOf(myString, "방에"));
   printf("indexOf : %d\\n", myString->indexOf(myString, "가신"));


   printf("JOB_LEN : %d\\n", myString->whichJob(myString, "가방", JOB_LEN));
   printf("JOB_EQU : %d\\n", myString->whichJob(myString, "가방", JOB_EQU));
   printf("JOB_IND : %d\\n", myString->whichJob(myString, "가방", JOB_IND));

   my_delete_string(myString);
}