Program 291: Program to prepare Agenda(Events on a particular day) and Store in file using C

Program 291: Program to prepare Agenda(Events on a particular day) and Store in file using C

#include <stdio.h>
#include<stdlib.h>
#include <string.h>
char* months[] = {"Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec","Jan","Feb"};
char* days[]= { "sunday","monday", "tuesday", "wednesday", "thursday", "friday", "saturday" };
int Day(int k,int m,int year);
main()
{
 int k,m,year,i,flag=0,totdates,date,finalday,toContinueAdding,count=0,addViewAgenda;
 char str[3],day[100],event[200],dateInString[2],yearInString[5],storeEvent[400];
 printf("Enter\n1-Add Event in Agenda\n2-View Stored Agendas\n3-Exit\n");
  scanf("%d",&addViewAgenda);
 do{
  if(addViewAgenda==1)
  {
       printf("enter Date\n");
       scanf("%d",&date);
       printf("Enter first 3 letters of month of the year ex:-for January enter Jan\n");
       scanf("%s",str);
       for(i=0; i<12; i++)
       {
        if(!strcmp(str,months[i]))
        {
            m=i+1;
            flag=1;
            break;
        }
       }
      if(flag==0)
      {
       printf("Invalid Month\n");
       exit(0);
      }
      if(m==1 || m==3 || m==5 || m==6 || m==8 || m==10 || m==11)
       {
       totdates=31;
       }
       if(m==2 || m==4 || m==7 || m==9)
       {
        totdates=30;
       }
       if(m==12)
       {
        if(year%400==0||year%4==0)
        {
         totdates=29;
        }
        else
        {
         totdates=28;
        }
        }
        if(date>totdates){
         printf("You entered date which is not there in month\n");
         break;
        }
        printf("Enter year\n");
        scanf("%d",&year);
        finalday=Day(date,m,year);
        printf("You have Entered %d-%s-%d ,%s\n",date,months[m-1],year,days[finalday]);
        printf("Do you want to continue to add Agenda on this Particular Day?\nIf Yes Press 1 else any other number\n");
        scanf("%d",&toContinueAdding);
         if(toContinueAdding==1)
         {
          count++;
          FILE *file;
            char c;
            file=fopen("Agenda.txt","a");
            if(file==NULL)
            {
              printf("File Not Found\n");
              exit(0);
             }
          else
          {
        sprintf(dateInString,"%d",date);
          sprintf(yearInString,"%d",year);
          strcpy(storeEvent,"Event Date: ");
          strcat(storeEvent,days[finalday]);
          strcat(storeEvent,", ");
          strcat(storeEvent,dateInString);
          strcat(storeEvent,"-");
          strcat(storeEvent,months[m-1]);
          strcat(storeEvent,"-");
          strcat(storeEvent,yearInString);
          strcat(storeEvent,"\n");
          strcat(storeEvent,"Event: ");
          printf("Enter An Event to Add\n");
         fflush(stdin);
          gets(event);
          strcat(storeEvent,event);
          strcat(storeEvent,"\n");
              fputs(storeEvent,file);
              fputs("\n",file);
            
         }
       fclose(file);
      
       }
  }
  else
  {
   FILE *file1;
   char c;
   file1=fopen("Agenda.txt","r");
   while(1)
   {
    if(file1==NULL)
    {
     printf("File Not Found\n");
                exit(0);
    }
    else
    {
     c=fgetc(file1);
     if(c==EOF)
     break;
     
     printf("%c",c);
    }
   }
   fclose(file1);
  }
     printf("Enter\n1-Add Event in Agenda\n2-View Stored Agendas\n3-Exit\n");
  scanf("%d",&addViewAgenda);
   }while(addViewAgenda==1 || addViewAgenda==2);
  printf("Thank You\n");
}

int Day(int k,int m,int year)
{
   int D,C,i,f,finalday,flag=0;
   char day[100];
   if(k<=0||k>31)
   {
     printf("Invalid Date\n");
     exit(0);
    }
    if(m==11||m==12)
     {
       year=year-1;
     }
     D=year%100;
     C=year/100;
     f = (k+(((13*m)-1)/5)+D+(D/4)+(C/4))-(2*C);

     if(f>=0)
     {
       finalday=f%7;
      }
      else
     {
       finalday=((f%7)+7)%7;
      }

      return(finalday);

}

Explanation:

Both Agenda.txt and C Programs should be in same file

Output: