Πηγαίος κώδικας για δημιουργία Ημερολογίου στην C!!!

Κάποια στιγμή στα πρώτα

φοιτητικά μου χρόνια μου είχε

χρειαστεί να φτίαξω ένα απλό

ημερολόγιο σε γλώσσα C, μιας

και μίλησα με συμφοιτητές

μου(νεώτερους) το θυμήθηκα και

είπα να βρω τον αντίστοιχο

κώδικα.

// This calendar example is provided by:
// http://www.codingunit.com Programming Tutorials

#include<stdio.h>

#define TRUE    1
#define FALSE   0

int days_in_month[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
char *months[]=
{
 " ",
 "\n\n\nJanuary",
 "\n\n\nFebruary",
 "\n\n\nMarch",
 "\n\n\nApril",
 "\n\n\nMay",
 "\n\n\nJune",
 "\n\n\nJuly",
 "\n\n\nAugust",
 "\n\n\nSeptember",
 "\n\n\nOctober",
 "\n\n\nNovember",
 "\n\n\nDecember"
};


int inputyear(void)
{
 int year;
 
 printf("Please enter a year (example: 1999) : ");
 scanf("%d", &year);
 return year;
}

int determinedaycode(int year)
{
 int daycode;
 int d1, d2, d3;
 
 d1 = (year - 1.)/ 4.0;
 d2 = (year - 1.)/ 100.;
 d3 = (year - 1.)/ 400.;
 daycode = (year + d1 - d2 + d3) %7;
 return daycode;
}


int determineleapyear(int year)
{
 if(year% 4 == FALSE && year%100 != FALSE || year%400 == FALSE)
 {
  days_in_month[2] = 29;
  return TRUE;
 }
 else
 {
  days_in_month[2] = 28;
  return FALSE;
 }
}

void calendar(int year, int daycode)
{
 int month, day;
 for ( month = 1; month <= 12; month++ )
 {
  printf("%s", months[month]);
  printf("\n\nSun  Mon  Tue  Wed  Thu  Fri  Sat\n" );
  
  // Correct the position for the first date
  for ( day = 1; day <= 1 + daycode * 5; day++ )
  {
   printf(" ");
  }
  
  // Print all the dates for one month
  for ( day = 1; day <= days_in_month[month]; day++ )
  {
   printf("%2d", day );
   
   // Is day before Sat? Else start next line Sun.
   if ( ( day + daycode ) % 7 > 0 )
    printf("   " );
   else
    printf("\n " );
  }
   // Set position for next month
   daycode = ( daycode + days_in_month[month] ) % 7;
 }
}


int main(void)
{
 int year, daycode, leapyear;
 
 year = inputyear();
 daycode = determinedaycode(year);
 determineleapyear(year);
 calendar(year, daycode);
 printf("\n");
}

ΠΗΓΗ: http://www.codingunit.com/how-to-make-a-calendar-in-c