C언어 - 열거형의 활용 (메시지 맵의 기본 형식)

- 열거형의 활용

#include<stdio.h>

const char*day[] = {
        "월요일", 
        "화요일",
        "수요일",
        "목요일",
        "금요일",
        "토요일",
        "일요일",            
          0};
void MONDAY();
void TUESDAY();
void WENDSDAY();
void THURSDAY();
void FRIDAY();
void SATURDAY();
void SUNDAY();

enum day_num
{
        MON,
        TUE,
        WED,
        THU,
        FRI,
        SAT,
        SUN,

        END
};
int main()
{
        int iNum;
        for(iNum = MON; END > iNum; ++iNum)
        {
                printf("%s\n", day[iNum]);
        }
        return 0;
}

⇒ 출력 결과         

 

#include<stdio.h>

void MONDAY();
void TUESDAY();
void WENDSDAY();
void THURSDAY();
void FRIDAY();
void SATURDAY();
void SUNDAY();

struct MessageMap
{
        const char *name;
        void (*fp)();    
};

struct MessageMap map[]={
        {"월요일", MONDAY},
        {"화요일", TUESDAY},
        {"수요일", WENDSDAY},
        {"목요일", THURSDAY},
        {"금요일", FRIDAY},  
        {"토요일", SATURDAY},
        {"일요일", SUNDAY},
        {0, 0}
};
enum day_num
{
        MON,
        TUE,
        WED,
        THU,
        FRI,
        SAT,
        SUN,

        END
};

int main()
{
        int iCnt; // 요일을 찾는다. 찾으면 해당하는 번호의 함수를 부르는 역활.
        int  iRet;
        int  iRet2;
        char buff[10];
  
  
        while(1)
        {
                write(1, "요일 입력>", 10);    
                iRet = read(0, buff, sizeof(buff));
                buff[iRet-1] = 0;
                iRet = strlen(buff); // buff 길이를 확인
                if(iRet == 0) // 입력값이 없으면 종료
                {
                        break;
                }
                for(iCnt = MON;iCnt<END;++iCnt)
                {
                        //iRet = strcmp(map[iCnt].name, buff);
                        iRet2 = strncmp(map[iCnt].name, buff, iRet);
                        if(iRet2 == 0)
                        {
                                break;
                        }      
                }  
                if(iCnt >= END) // 요일이 정확히 입력 안되면 위로 다시 되돌린다.
                {
                        continue;
                }
                map[iCnt].fp(); //
        }
  
        return 0;
}
void MONDAY()
{
        printf("%s(MONDAY)\n", map[MON].name);
        return ;
}
void TUESDAY()
{
        printf("%s(THESDAY)\n", map[TUE].name);
        return ;
}
void WENDSDAY()
{
        printf("%s(WENDSDAY)\n", map[WED].name);
        return ;
}
void THURSDAY()
{
        printf("%s(THURSDAY)\n", map[THU].name);
        return ;
}
void FRIDAY()
{
        printf("%s(FRIDAY)\n", map[FRI].name);
        return ;
}
void SATURDAY()
{
        printf("%s(SATURDAY)\n", map[SAT].name);
        return ;
}
void SUNDAY()
{
        printf("%s(SUNDAY)\n", map[SUN].name);
        return ;
}
⇒ 출력 결과