Programalama > C++

/*This program prints a calendar for a year specified. The user enters a
     year for the calendar and the programs automatically prints the calendar
     in text format.

     The codes are: day_code (0 = Sun, 1 = Mon, etc.)
                    leap_year (0 = no leap year, 1 = leap year)   */

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

#define TRUE 1
#define FALSE 0

int get_day_code (int year);
int get_leap_year (int year);
void print_calendar (FILE *fout, int year, int day_code, int leap_year);
int get_year (void);

main()
  {
    int year, day_code, leap_year;
    FILE *fout;
    fout = fopen ("calendar.txt", "w");
    year = get_year();
    day_code = get_day_code (year);
    leap_year = get_leap_year (year);
    print_calendar(fout, year, day_code, leap_year);
    printf("Open up \'calendar.txt\' to see your calendar...\n");
    system("pause");
  }

int get_year (void)
  {
    int year;
    printf ("Enter a year: ");
    scanf ("%d", &year);
    return year;
  }

int get_day_code (int year)
  {
    int day_code;
    int x1, x2, x3;
    x1 = (year - 1.)/ 4.0;
    x2 = (year - 1.)/ 100.;
    x3 = (year - 1.)/ 400.;
    day_code = (year + x1 - x2 + x3) %7;
    return day_code;
  }

int get_leap_year (int year)
  {
    //if((year% 4) == 0 );
    if(year% 4==0 && year%100 != 0 || year%400==0)
    return TRUE;
    else return FALSE;
  }

void print_calendar (FILE *fout, int year, int day_code, int leap_year) //function header
  {
    int  days_in_month,     /* number of days in month currently being printed */
	 day,       /* counter for day of month */
	 month;     /* month = 1 is Jan, month = 2 is Feb, etc. */

    fprintf (fout,"                   %d", year);
    for ( month = 1; month <= 12; month++ )
      {
	switch ( month )
	  { /* print name and set days_in_month */
	    case 1:  fprintf(fout,"\n\nJanuary" );
		     days_in_month = 31;
		     break;
	    case 2:  fprintf(fout,"\n\nFebruary" );
		     days_in_month = leap_year ? 29 : 28;
		     break;
	    case 3:  fprintf(fout, "\n\nMarch" );
		     days_in_month = 31;
		     break;
	    case 4:  fprintf(fout,"\n\nApril" );
		     days_in_month = 30;
		     break;
	    case 5:  fprintf(fout,"\n\nMay" );
		     days_in_month = 31;
		     break;
	    case 6:  fprintf(fout,"\n\nJune" );
		     days_in_month = 30;
		     break;
	    case 7:  fprintf(fout,"\n\nJuly" );
		     days_in_month = 31;
		     break;
	    case 8:  fprintf(fout,"\n\nAugust" );
		     days_in_month = 31;
		     break;
	    case 9:  fprintf(fout,"\n\nSeptember" );
		     days_in_month = 30;
		     break;
	    case 10: fprintf(fout,"\n\nOctober" );
		     days_in_month = 31;
		     break;
	    case 11: fprintf(fout,"\n\nNovember" );
		     days_in_month = 30;
		     break;
	    case 12: fprintf(fout,"\n\nDecember" );
		     days_in_month = 31;
		     break;
	  }
	fprintf(fout,"\n\nSun  Mon  Tue  Wed  Thu  Fri  Sat\n" );
	/* advance printer to correct position for first date */
	for ( day = 1; day <= 1 + day_code * 5; day++ )
	  fprintf(fout," " );
	/* print the dates for one month */
	for ( day = 1; day <= days_in_month; day++ )
	  {
	    fprintf(fout,"%2d", day );
	    if ( ( day + day_code ) % 7 > 0 ) /* before Sat? */
	    /* move to next day in same week */
	      fprintf(fout,"   " );
	    else  /* skip to next line to start with Sun */
	      fprintf(fout, "\n " );
	   }
    /* set day_code for next month to begin */
    day_code = ( day_code + days_in_month ) % 7;
      }
  }