/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 

*                                         *

* File: day.c                                   *

*                                         *

* Purpose: getting a month and date as input, outputting the day         *

*                                         *  

* Usage: day.exe <month> <date>                          *

*                                         *

* Copyright (C) 2004 Scorpius, scorpius_unknown@yahoo.com, all rights reserved  *

*                                         *

* This program is free software; you can redistribute it and/or          *

* modify it under the terms of the GNU General Public License           *

* as published by the Free Software Foundation; either version 2         *

* of the License, or (at your option) any later version.             *

*                                         *

* This program is distributed in the hope that it will be useful,         *

* but WITHOUT ANY WARRANTY; without even the implied warranty of         *

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the          *

* GNU General Public License for more details.                  *

*                                         *

* You should have received a copy of the GNU General Public License        *

* along with this program; if not, write to the Free Software           *

* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.   *

*                                         *

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */



#include <stdio.h>

#include <strings.h>



int main(int argc,char *argv[])

{

  /*first arguments checking*/

  if (argc<3)

  {

    printf("Too few arguments, usage: %s <month> <date>",argv[0]);

    return 1;

  }

  if (argc>3)

  {

    printf("Too many arguments, usage: %s <month> <date>",argv[0]);

    return 1;

  }

/*now for the actual program*/

  

  const char *months[]={"jan","feb","mar","apr","may","jun","jul","aug","sep","okt","nov","dec"};

  const char *days[]={"monday","tuesday","wednesday","thursday","friday","saturday","sunday"};

  const int zero_th[]={2,4,4,6,0,2,3,4,0,1,3,4};

  int day=atoi(argv[2]);

  int i,count=0,int_months=0;

  char buf[strlen(argv[1])];

  strcpy(buf,argv[1]);

  if(buf[3]!='\0')

  {

    printf("Usage: %s <month> <date>",argv[0]);

    return 1;

  }    

  for (i=0;i<12;i++)

  {

    if (strcmp(buf,months[i])==0)

    {

      int_months=i;

      break;

    }

    else

    {

      count++;

    }    

  } 

  if (count>11)

  {

    printf("Unrecognized Month [%s]: use jan, feb, mar, etc",buf);

    return 1;

  }  

  if ((day<1)||(day>31))

  {

     printf("Usage: %s <month> <date>",argv[0]);

    return 1;

  }

  i=((day+int_months+zero_th[int_months])%7);

  printf("%s",days[i]);

  return 0;

}