calendar

[mortezamarzbani]

/*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;
}
}