It is a method for organizing daily schedules. This involves assigning labels to specific time intervals, commonly including days, weeks, months, and years. Within this framework, a specific day is denoted by a date. A physical manifestation of this system is a calendar, usually crafted from paper. Additionally, the term "calendar" can also denote a schedule of upcoming events, like a court schedule, or a compilation of records arranged chronologically, such as a wills schedule.
Program Breakdown
Example
struct Date {
int dd ;
int mm ;
int yy ;
} ;
We are developing a class to represent dates, with private attributes for day, month, and year.
Example
struct Remainder {
int dd ;
int mm ;
char note [ 50 ] ;
} ;
We are developing a class for storing remainders, with private attributes including date, month, and a character array named note.
Example
void SetColor ( int ForgC )
{
WORD wColor ;
//We will need this handle to get the current background attribute
HANDLE hStdOut = GetStdHandle ( STD_OUTPUT_HANDLE ) ;
CONSOLE_SCREEN_BUFFER_INFO csbi ;
//We use csbi for the wAttributes word.
if ( GetConsoleScreenBufferInfo ( hStdOut , & csbi ) )
{
//Mask out all but the background attribute, and add in the forgournd color
wColor = ( csbi.wAttributes & 0xF0 ) + (ForgC & 0x0F ) ;
SetConsoleTextAttribute ( hStdOut , wColor ) ;
}
return ;
}
This function will establish the foreground color for displaying text in a console window.
Example
void ClearConsoleToColors ( int ForgC , int BackC )
{
WORD wColor = ( ( BackC & 0x0F ) < < 4 ) + ( ForgC & 0x0F ) ;
//Get the handle to the current output buffer ...
HANDLE hStdOut = GetStdHandle ( STD_OUTPUT_HANDLE ) ;
//This is used to reset the carat/cursor to the top left.
COORD coord = { 0 , 0 } ;
//A return value ... indicating how many chars were written
// not used but we need to capture this since it will be
// written anyway ( passing NULL causes an access violation ).
DWORD count ;
//This is a structure containing all of the console info
// it is used here to find the size of the console.
CONSOLE_SCREEN_BUFFER_INFO csbi ;
//Here we will set the current color
SetConsoleTextAttribute ( hStdOut , wColor ) ;
if ( GetConsoleScreenBufferInfo ( hStdOut , & csbi ) )
{
//This fills the buffer with a given character (in this case 32=space).
FillConsoleOutputCharacter ( hStdOut , ( TCHAR ) 32 , csbi . dwSize . X * csbi.dwSize.Y , coord , &count ) ;
FillConsoleOutputAttribute ( hStdOut , csbi . wAttributes , csbi . dwSize . X * csbi . dwSize . Y , coord , & count ) ;
//This will set our cursor position for the next print statement.
SetConsoleCursorPosition ( hStdOut , coord ) ;
}
return ;
}
This arrangement comprises all the console information utilized to determine the console size.
Example
void SetColorAndBackground ( int ForgC , int BackC )
{
WORD wColor = ( ( BackC & 0x0F ) < < 4 ) + ( ForgC & 0x0F ) ;
SetConsoleTextAttribute ( GetStdHandle ( STD_OUTPUT_HANDLE ) , wColor ) ;
return ;
}
The preceding function is employed to establish the background color of the console.
Example
int check_leapYear ( int year ) { //checks whether the year passed is leap year or not
if ( year % 400 = = 0 || ( year % 100 ! = 0 & & year % 4 = =0 ) )
return 1 ;
return 0 ;
}
The code snippet above is employed to verify whether the year input by the user is a leap year or not.
Example
int getNumberOfDays ( int month , int year ){ //returns the number of days in given month
switch ( month ) { //and year
case 1 : return ( 31 ) ;
case 2 : if ( check_leapYear ( year ) = = 1 )
return ( 29 ) ;
else
return ( 28 ) ;
case 3 : return ( 31 ) ;
case 4 : return ( 30 ) ;
case 5 : return ( 31 ) ;
case 6 : return ( 30 ) ;
case 7 : return ( 31 ) ;
case 8 : return ( 31 ) ;
case 9 : return ( 30 ) ;
case 10 : return ( 31 ) ;
case 11 : return ( 30 ) ;
case 12 : return ( 31 ) ;
default : return ( -1 ) ;
}
}
The function mentioned above will provide the count of days in the given month.
Example
char * getName ( int day ) { //returns the name of the day
switch ( day ) {
case 0 : return ( " Sunday " ) ;
case 1 : return ( " Monday " ) ;
case 2 : return ( " Tuesday " ) ;
case 3 : return ( " Wednesday " ) ;
case 4 : return ( " Thursday " ) ;
case 5 : return ( " Friday " ) ;
case 6 : return ( " Saturday " ) ;
default : return ( " Error in getName ( ) module.Invalid argument passed " ) ;
}
}
The function mentioned above is in charge of providing the day's name.
Example
void AddNote ( ) {
FILE * fp ;
fp = fopen ( " note.dat " , " ab+ " ) ;
system ( " cls " ) ;
gotoxy ( 5 ,7 ) ;
printf ( " Enter the date ( DD / MM ) : " ) ;
scanf ( " % d % d " , & R . dd , & R . mm ) ;
gotoxy ( 5 , 8 ) ;
printf ( " Enter the Note ( 50 character max ) : " ) ;
fflush ( stdin ) ;
scanf ( " % [ ^ \ n ] " , R.note ) ;
if ( fwrite ( & R , sizeof ( R ) , 1 , fp ) ) {
gotoxy ( 5 , 12 ) ;
puts ( " Note is saved sucessfully " ) ;
fclose ( fp ) ;
}else {
gotoxy ( 5 , 12 ) ;
SetColor ( 12 ) ;
puts ( " \ a Fail to save!! \ a " ) ;
ClearColor ( ) ;
}
gotoxy ( 5 , 15 ) ;
printf ( " Press any key............" ) ;
getch ( ) ;
fclose ( fp ) ;
}
If an individual intends to insert a note on a specific date, they can achieve this using the function described above.
Example
void showNote ( int mm ) {
FILE * fp ;
int i = 0 , isFound = 0 ;
system ( " cls " ) ;
fp = fopen ( " note . dat " , " rb " ) ;
if ( fp = = NULL ) {
printf ( " Error in opening the file " ) ;
}
while ( fread ( &R , sizeof ( R ) , 1 , fp ) = = 1 ) {
if ( R.mm = = mm ) {
gotoxy ( 10 , 5 + i ) ;
printf ( " Note % d Day = % d : % s " , i + 1 , R . dd , R . note ) ;
isFound = 1 ;
i + + ;
}
}
if ( isFound = = 0 ) {
gotoxy ( 10 ,5 ) ;
printf ( " This Month contains no note " ) ;
}
gotoxy ( 10 , 7 + i ) ;
printf ( " Press any key to back....... " ) ;
getch ( ) ;
}
The function mentioned above is utilized to display the note that has been added by the user.
Program for Calendar Application in C
Example
#include<stdio.h>
#include<conio.h>
#include<windows.h>
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
struct Date{
int dd;
int mm;
int yy;
};
struct Date date;
struct Remainder{
int dd;
int mm;
char note[50];
};
struct Remainder R;
COORD xy = {0, 0};
void gotoxy (int x, int y)
{
xy.X = x; xy.Y = y; // X and Y coordinates
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), xy);
}
//This will set the forground color for printing in a console window.
void SetColor(int ForgC)
{
WORD wColor;
//We will need this handle to get the current background attribute
HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
CONSOLE_SCREEN_BUFFER_INFO csbi;
//We use csbi for the wAttributes word.
if(GetConsoleScreenBufferInfo(hStdOut, &csbi))
{
//Mask out all but the background attribute, and add in the forgournd color
wColor = (csbi.wAttributes & 0xF0) + (ForgC & 0x0F);
SetConsoleTextAttribute(hStdOut, wColor);
}
return;
}
void ClearColor(){
SetColor(15);
}
void ClearConsoleToColors(int ForgC, int BackC)
{
WORD wColor = ((BackC & 0x0F) << 4) + (ForgC & 0x0F);
//Get the handle to the current output buffer...
HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
//This is used to reset the carat/cursor to the top left.
COORD coord = {0, 0};
//A return value... indicating how many chars were written
// not used but we need to capture this since it will be
// written anyway (passing NULL causes an access violation).
DWORD count;
//This is a structure containing all of the console info
// it is used here to find the size of the console.
CONSOLE_SCREEN_BUFFER_INFO csbi;
//Here we will set the current color
SetConsoleTextAttribute(hStdOut, wColor);
if(GetConsoleScreenBufferInfo(hStdOut, &csbi))
{
//This fills the buffer with a given character (in this case 32=space).
FillConsoleOutputCharacter(hStdOut, (TCHAR) 32, csbi.dwSize.X * csbi.dwSize.Y, coord, &count);
FillConsoleOutputAttribute(hStdOut, csbi.wAttributes, csbi.dwSize.X * csbi.dwSize.Y, coord, &count );
//This will set our cursor position for the next print statement.
SetConsoleCursorPosition(hStdOut, coord);
}
return;
}
void SetColorAndBackground(int ForgC, int BackC)
{
WORD wColor = ((BackC & 0x0F) << 4) + (ForgC & 0x0F);;
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), wColor);
return;
}
int check_leapYear(int year){ //checks whether the year passed is leap year or not
if(year % 400 == 0 || (year % 100!=0 && year % 4 ==0))
return 1;
return 0;
}
void increase_month(int *mm, int *yy){ //increase the month by one
++*mm;
if(*mm > 12){
++*yy;
*mm = *mm - 12;
}
}
void decrease_month(int *mm, int *yy){ //decrease the month by one
--*mm;
if(*mm < 1){
--*yy;
if(*yy<1600){
printf("No record available");
return;
}
*mm = *mm + 12;
}
}
int getNumberOfDays(int month,int year){ //returns the number of days in given month
switch(month){ //and year
case 1 : return(31);
case 2 : if(check_leapYear(year)==1)
return(29);
else
return(28);
case 3 : return(31);
case 4 : return(30);
case 5 : return(31);
case 6 : return(30);
case 7 : return(31);
case 8 : return(31);
case 9 : return(30);
case 10: return(31);
case 11: return(30);
case 12: return(31);
default: return(-1);
}
}
char *getName(int day){ //returns the name of the day
switch(day){
case 0 :return("Sunday");
case 1 :return("Monday");
case 2 :return("Tuesday");
case 3 :return("Wednesday");
case 4 :return("Thursday");
case 5 :return("Friday");
case 6 :return("Saturday");
default:return("Error in getName() module.Invalid argument passed");
}
}
void print_date(int mm, int yy){ //prints the name of month and year
printf("---------------------------\n");
gotoxy(25,6);
switch(mm){
case 1: printf("January"); break;
case 2: printf("February"); break;
case 3: printf("March"); break;
case 4: printf("April"); break;
case 5: printf("May"); break;
case 6: printf("June"); break;
case 7: printf("July"); break;
case 8: printf("August"); break;
case 9: printf("September"); break;
case 10: printf("October"); break;
case 11: printf("November"); break;
case 12: printf("December"); break;
}
printf(" , %d", yy);
gotoxy(20,7);
printf("---------------------------");
}
int getDayNumber(int day,int mon,int year){ //retuns the day number
int res = 0, t1, t2, y = year;
year = year - 1600;
while(year >= 100){
res = res + 5;
year = year - 100;
}
res = (res % 7);
t1 = ((year - 1) / 4);
t2 = (year-1)-t1;
t1 = (t1*2)+t2;
t1 = (t1%7);
res = res + t1;
res = res%7;
t2 = 0;
for(t1 = 1;t1 < mon; t1++){
t2 += getNumberOfDays(t1,y);
}
t2 = t2 + day;
t2 = t2 % 7;
res = res + t2;
res = res % 7;
if(y > 2000)
res = res + 1;
res = res % 7;
return res;
}
char *getDay(int dd,int mm,int yy){
int day;
if(!(mm>=1 && mm<=12)){
return("Invalid month value");
}
if(!(dd>=1 && dd<=getNumberOfDays(mm,yy))){
return("Invalid date");
}
if(yy>=1600){
day = getDayNumber(dd,mm,yy);
day = day%7;
return(getName(day));
}else{
return("Please give year more than 1600");
}
}
int checkNote(int dd, int mm){
FILE *fp;
fp = fopen("note.dat","rb");
if(fp == NULL){
printf("Error in Opening the file");
}
while(fread(&R,sizeof(R),1,fp) == 1){
if(R.dd == dd && R.mm == mm){
fclose(fp);
return 1;
}
}
fclose(fp);
return 0;
}
void printMonth(int mon,int year,int x,int y){ //prints the month with all days
int nod, day, cnt, d = 1, x1 = x, y1 = y, isNote = 0;
if(!(mon>=1 && mon<=12)){
printf("INVALID MONTH");
getch();
return;
}
if(!(year>=1600)){
printf("INVALID YEAR");
getch();
return;
}
gotoxy(20,y);
print_date(mon,year);
y += 3;
gotoxy(x,y);
printf("S M T W T F S ");
y++;
nod = getNumberOfDays(mon,year);
day = getDayNumber(d,mon,year);
switch(day){ //locates the starting day in calender
case 0 :
x=x;
cnt=1;
break;
case 1 :
x=x+4;
cnt=2;
break;
case 2 :
x=x+8;
cnt=3;
break;
case 3 :
x=x+12;
cnt=4;
break;
case 4 :
x=x+16;
cnt=5;
break;
case 5 :
x=x+20;
cnt=6;
break;
case 6 :
x=x+24;
cnt=7;
break;
default :
printf("INVALID DATA FROM THE getOddNumber()MODULE");
return;
}
gotoxy(x,y);
if(cnt == 1){
SetColor(12);
}
if(checkNote(d,mon)==1){
SetColorAndBackground(15,12);
}
printf("%02d",d);
SetColorAndBackground(15,1);
for(d=2;d<=nod;d++){
if(cnt%7==0){
y++;
cnt=0;
x=x1-4;
}
x = x+4;
cnt++;
gotoxy(x,y);
if(cnt==1){
SetColor(12);
}else{
ClearColor();
}
if(checkNote(d,mon)==1){
SetColorAndBackground(15,12);
}
printf("%02d",d);
SetColorAndBackground(15,1);
}
gotoxy(8, y+2);
SetColor(14);
printf("Press 'n' to Next, Press 'p' to Previous and 'q' to Quit");
gotoxy(8,y+3);
printf("Red Background indicates the NOTE, Press 's' to see note: ");
ClearColor();
}
void AddNote(){
FILE *fp;
fp = fopen("note.dat","ab+");
system("cls");
gotoxy(5,7);
printf("Enter the date(DD/MM): ");
scanf("%d%d",&R.dd, &R.mm);
gotoxy(5,8);
printf("Enter the Note(50 character max): ");
fflush(stdin);
scanf("%[^\n]",R.note);
if(fwrite(&R,sizeof(R),1,fp)){
gotoxy(5,12);
puts("Note is saved sucessfully");
fclose(fp);
}else{
gotoxy(5,12);
SetColor(12);
puts("\aFail to save!!\a");
ClearColor();
}
gotoxy(5,15);
printf("Press any key............");
getch();
fclose(fp);
}
void showNote(int mm){
FILE *fp;
int i = 0, isFound = 0;
system("cls");
fp = fopen("note.dat","rb");
if(fp == NULL){
printf("Error in opening the file");
}
while(fread(&R,sizeof(R),1,fp) == 1){
if(R.mm == mm){
gotoxy(10,5+i);
printf("Note %d Day = %d: %s", i+1, R.dd, R.note);
isFound = 1;
i++;
}
}
if(isFound == 0){
gotoxy(10,5);
printf("This Month contains no note");
}
gotoxy(10,7+i);
printf("Press any key to back.......");
getch();
}
int main(){
ClearConsoleToColors(15, 5);
SetConsoleTitle("Calender Project - ITSOURCECODE.COM");
int choice;
char ch = 'a';
while(1){
system("cls");
printf("1. Find Out the Day\n");
printf("2. Print all the day of month\n");
printf("3. Add Note\n");
printf("4. EXIT\n");
printf("ENTER YOUR CHOICE : ");
scanf("%d",&choice);
system("cls");
switch(choice){
case 1:
printf("Enter date (DD MM YYYY) : ");
scanf("%d %d %d",&date.dd,&date.mm,&date.yy);
printf("Day is : %s",getDay(date.dd,date.mm,date.yy));
printf("\nPress any key to continue......");
getch();
break;
case 2 :
printf("Enter month and year (MM YYYY) : ");
scanf("%d %d",&date.mm,&date.yy);
system("cls");
while(ch!='q'){
printMonth(date.mm,date.yy,20,5);
ch = getch();
if(ch == 'n'){
increase_month(&date.mm,&date.yy);
system("cls");
printMonth(date.mm,date.yy,20,5);
}else if(ch == 'p'){
decrease_month(&date.mm,&date.yy);
system("cls");
printMonth(date.mm,date.yy,20,5);
}else if(ch == 's'){
showNote(date.mm);
system("cls");
}
}
break;
case 3:
AddNote();
break;
case 4 :
exit(0);
}
}
return 0;
}
Output:
Output
. Find Out the Day
2. Print all the day of month
3. Add Note
4. EXIT
ENTER YOUR CHOICE :1
Enter date (DD MM YYYY) : 22 08 2022
ENTER YOUR CHOICE :2
---------------------------
August , 2022
---------------------------
S M T W T F S
01 02 03 04 05 06
07 08 09 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
Press 'n' to Next, Press 'p' to Previous and 'q' to Quit
Red Background indicates the NOTE, Press 's' to see note:
ENTER YOUR CHOICE: 3
Enter the date(DD/MM): 22 08
Enter the Note(50 character max): All you need is Logic Practice
Note is saved sucessfully
Press any key............
--------------------------------
Process exited after 393.4 seconds with return value 0
Press any key to continue . . .