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#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); //RETUNS 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 'º'
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 'É'
gotoxy(66,10);
printf("%c",187); //GARPH CHAR 187 '»'
gotoxy(15,40);
printf("%c",200); //GARPH CHAR 200 'È'
gotoxy(66,40);
printf("%c",188); //GARPH CHAR 188 '¼'
gotoxy(15,14);
printf("%c",204); //GARPH CHAR 204 'Ì'
gotoxy(66,14);
printf("%c",185); //GARPH CHAR 185 '¹'
gotoxy(15,36);
printf("%c",204); //GARPH CHAR 204 'Ì'
gotoxy(66,36);
printf("%c",185); //GARPH CHAR 185 '¹'

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
}