[C] 일정관리프로그램

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

int main(void)
{
        char calendar[12*31*100][26];
        char *pData;
        char temp[100],gyear[100];
        int i,j,week,year,month,day,th,count,lastday,tyear,mode,pos,tmonth;
        int num[12]={31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        FILE *file;
        for(i=0;i<26;i++)
                memset(calendar[i],0,12*31*100);
        pData=calendar[0];
        while(1)
        {
                printf("──────────────2000~2025년 일정 관리───────────────\n");
                printf("\n                 [1]일정 쓰기 [2]일정 확인 [3]저장 [4]열기 [0]종료 :");
                gets(temp);
                sscanf(temp,"%d",&mode);
                if(mode==0)
                        break;
                switch(mode)
                {
                case 1:
                        printf("YEAR: ");
                        gets(gyear);
                        sscanf(gyear,"%d",&year);
                        if(year>2025 || year<2000)
                        {
                                printf("다시 입력 하세요\n");
                                break;
                        }
                        tyear=year;
                        pData=calendar[year-2000];
                        printf("MONTH: ");
                        gets(temp);
                        sscanf(temp,"%d",&month);
                        tmonth=month;
                        if(tmonth>12 || tmonth<1)
                        {
                                printf("다시 입력 하세요\n");
                                break;
                        }
                        lastday = num[tmonth - 1];
                        if( tmonth == 2 && (!(tyear%4) && (tyear%100) || !(tyear%400)) )
                                lastday = 29;
                        if (tmonth == 2 || tmonth == 1)
                        {
                                tyear--;
                                tmonth += 12;
                        }
                        th = tyear / 100;
                        tyear = tyear % 100;
                        week = ((21 * th / 4) + (5 * tyear / 4) + (26 * (tmonth + 1)) / 10) % 7;
                        printf("\n 일 월 화 수 목 금 토 \n");
                        count = 1;
                        for (i = 0; i < 6 ; i++)
                        {
                                for (j = 0; j < 7; j++)
                                {
                                        if(i == 0 && j < week)
                                                printf("%3s"," ");
                                        else
                                        {
                                                printf("%3d", count);
                                                count++;
                                        }
                                        if (count > lastday)
                                                break;
                                }
                                printf("\n");
                                if (count > lastday)
                                        break;
                        }
                        printf("\nDAY: ");
                        gets(temp);
                        sscanf(temp,"%d",&day);
                        if(day>lastday || day<1)
                        {
                                printf("다시 입력 하세요\n");
                                break;
                        }
                        pos=month*day*10;
                        pData=pData+pos;
                        printf("\n●일정을 쓰세요.\n");
                        printf("\n   %d년 %d월 %d일 :",year,month,day);
                        gets(temp);
                        strcpy(pData,temp);
                        break;
                case 2:
                        printf("YEAR: ");
                        gets(temp);
                        sscanf(temp,"%d",&year);
                        if(year>2025 || year<2000)
                        {
                                printf("다시 입력 하세요\n");
                                break;
                        }
                        pData=calendar[year-2000];
                        printf("MONTH: ");
                        gets(temp);
                        sscanf(temp,"%d",&month);
                        if(month>12 || month<1)
                        {
                                printf("다시 입력 하세요\n");
                                break;
                        }
                        printf("DAY: ");
                        gets(temp);
                        sscanf(temp,"%d",&day);
                        if(day<1)
                        {
                                printf("다시 입력 하세요\n");
                                break;
                        }
                        pos=month*day*10;
                        pData=pData+pos;
                        printf("\n●일정 입니다.\n");
                        printf("\n   %d년 %d월 %d일 :%s\n",year,month,day,pData);
                        break;
                case 3:
                        file=fopen("test.db","wb");
                        for(i=0;i<26;i++)
                                fwrite(calendar[i],1,12*31*100,file);
                        fclose(file);
                        break;
                case 4:
                        file=fopen("test.db","rb");
                        for(i=0;i<26;i++)
                                fread(calendar[i],1,12*31*100,file);
                        fclose(file);
                        pData=calendar[0];
                        break;
                default:
                        printf("다시 입력 하세요\n");
                        break;
                }
        }
}

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