This virtual calender shows current month and user can navigate

This virtual calender shows current month and user can navigate through previous or next month / year using arrow keys


This virtual calender shows current month and user can navigate
through previous or next month / year using arrow keys

Code :
#include "conio.h"
#include "stdlib.h"
#include "dos.h"
#include "string.h"
#include "stdio.h"

void draw(int, int);    //DRAWS BOX WITH MONTH & YEAR IN HEADER
void show_time();       //DISPLAYS CURRENT TIME IN FOOTER OF BOX
void print_cal( int, int); //PRINTS DATES WITHIN BOX
int getkey();              //SCANS USER KEY AND RETUEN ITS SCAN CODE
int first_day( int, int ); //DETEMINES FIRST DAY OF MONTH
int today;

void main()
{
 int year, month;
 char ch;
 struct date d;
 getdate(&d);        //RETURNS CURRENT DATE
 year = d.da_year;
 month = d.da_mon - 1;
 today = d.da_day - 1;     //GET CURRENT DATE
 print_cal(year, month); //PRINTS CALENDER OF CURRENT MONTH
 flushall();
 while((ch = getkey()) != 1) //KEEP TRACK OF KEYS UNTILL 'ESC' PRESSED
 {
  switch(ch)
  {
   case 72: year++;  //UP ARROW KEY
      break;
   case 80: year--; //DOWN ARROW KEY
      break;

   case 77: month++;        //RIGHT ARROW KEY
      if(month > 11)
      {
       month = 0;
       year++;
      }
      break;
   case 75: month--;       //LEFT ARROW KEY
      if(month < 0)
      {
       month = 11;
       year--;
      }
      break;
  }
  print_cal(year, month);  //PRINTS CALENDER OF CHANGED MONTH OR YEAR
 }
}
void show_time()
{
 struct  time t;
 while(!kbhit())
 {
  textcolor(YELLOW);
  gettime(&t);     //GET CURRENT TIME
  gotoxy(22,2);
  if(t.ti_hour < 13)
   printf(" CURRENT TIME => %2d:%02d:%02d AM",t.ti_hour, t.ti_min,
t.ti_sec);
  else
  {
   t.ti_hour -= 12;
   printf(" CURRENT TIME => %2d:%02d:%02d PM",t.ti_hour, t.ti_min,
t.ti_sec);
  }

  delay(1000);
 }
}

int first_day(int year, int month)  //DETEMINES FIRST DAY OF MONTH
{
 int mdays[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 
334};
 int lpyear = ((year-1900)/4) + ((year-1900)/400) - ((year-1900)/100);
 long unsigned days = ((year-1900)*365) + lpyear + mdays[month];
 return days % 7;
}
int getkey()    //SCANS USER KEY AND RETURN ITS SCAN CODE
{
 union REGS i,o;
 while(!kbhit())
  ;
 i.h.ah = 0;
 int86(22,&i,&o);
 return(o.h.ah);
}
void draw(int year, int month) //DRAWS BOX WITH MONTH & YEAR IN HEADER
{
 char *mo[] = { "January", "Feburary", "March", "April",
      "May", "June", "July", "August", "September",
      "October",  "November", "December" };
 char *day[] = { "SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
 int i, j;
 int ro = 205, co = 186;  //GARPH CHAR 205 '�', 186 '�'
 clrscr();
 gotoxy(16, 8);
 printf("USE ARROW KEYS TO NAVIGATE AND ESC KEY TO CLOSE");
 for( i = 16; i <= 65; i++)
 { gotoxy(i,10);
  printf ("%c",ro);
  gotoxy(i,14);
  printf ("%c",ro);
  gotoxy(i,36);
  printf ("%c",ro);
  gotoxy(i,40);
  printf ("%c",ro);
 }
 for(i = 11; i <= 39; i++)
 { gotoxy(15,i);
  printf ("%c",co);
  gotoxy(66,i);
  printf ("%c",co);
 }
 gotoxy(15,10);
 printf("%c",201);  //GARPH CHAR 201 '�'
 gotoxy(66,10);
 printf("%c",187);  //GARPH CHAR 187 '�'
 gotoxy(15,40);
 printf("%c",200);  //GARPH CHAR 200 '�'
 gotoxy(66,40);
 printf("%c",188);  //GARPH CHAR 188 '�'
 gotoxy(15,14);
 printf("%c",204);  //GARPH CHAR 204 '�'
 gotoxy(66,14);
 printf("%c",185);  //GARPH CHAR 185 '�'
 gotoxy(15,36);
 printf("%c",204);  //GARPH CHAR 204 '�'
 gotoxy(66,36);
 printf("%c",185);  //GARPH CHAR 185 '�'

 textcolor(YELLOW + BLINK);
 int hed_sp = 16 +((49 - (strlen(mo[month]) + 5))/2); //ALLIGN HEADER 
TO
CENTER
 gotoxy(hed_sp,12);
 cprintf("%s %d",mo[month],year);
 window(16,15,65,35);
 clrscr();
 for(i=1, j = 0; i<49; i+=7,j++) //PRINT DAY NAMES
 {
    if(i < 7)
  textcolor(RED); // FOR SUNDAY
    else
  textcolor(YELLOW); //OTHER THAN SUNDAY
  gotoxy(i,3);
  cprintf("%5s",day[j]);
 }
}
void print_cal(int year, int month)
{
 int i, j, start, count, limit;
 textmode(64);
 start = first_day(year, month);
 count = 0, limit = 31;
 draw(year, month);
 if( month == 3 || month == 5 || month == 8 || month == 10 )
 limit = 30;     //FOR APRIL, JUNE, SEPT, NOV
 if(month == 1 ) //FOR FEB
  limit = (year% 4==0 && year%100 != 0 || year%400==0)? 29: 28;
 for(j=7; j< 20; j+=3) //ROW COUNTER
 {
   for(i=1; i<49; i+=7) //COLUMN COUNTER
   {
   if(i < 7)
    textcolor(RED);     //DATES ON SUNDAY
   else
    textcolor(YELLOW);
   gotoxy(i,j);
   if(start)
    start--;     //EMPTY SPACES TILL NUMBERING STARTS
   else
   {
    if(count == today)      //HILIGHT CURRENT DATE
    {
     textcolor(BLUE);
     textbackground(YELLOW);
    }
    else
    {
     textcolor(YELLOW);
     textbackground(BLACK);
    }
    cprintf("%4d",count+1);   //PRINT DATE
    count++;
   }
   if(count >= limit)
    break;
  }
 }
 if(count <= 30 && count < limit) //FOR PRINTING IN FIRST ROW IF ALL 
ROWS
EXUASTED
 {  for(i=1; i<49; i+=7)
  {
  if(i < 7)
   textcolor(RED);
  else
   textcolor(YELLOW);
  gotoxy(i,7);
  if(count == today)
  {
   textcolor(BLUE);
   textbackground(YELLOW);
  }
  else
  {
   textcolor(YELLOW);
   textbackground(BLACK);
  }
  cprintf("%4d",count+1);
  count++;
  if(count >= limit)
  break;
  }
 }
 window(16,37,65,39);  //SETS WINDOW TO BOTTOM OF BOX
 show_time();          //SHOWS TIME
}
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This virtual calender shows current month and user can navigate

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