This mini project on Calendar in C programming language is a console application without graphics. To make the calendar look colorful, many windows properties have been used in this project. Besides the color used in backgrounds, the days of the month are white and the vacations (Sundays) are indicated using the red foreground color.
In this mini project, you can find out the day corresponding to a given date and view the days and dates corresponding to a particular month+year. The source code is not that long, over 400 lines. It is compiled in Code::Blocks IDE with GCC compiler.
To help you understand the calendar mini project better, there are lots of comments within the source code. This project is aimed to teach you “how to make Calendar using C”. Click on the link below to directly download the source code along with the executable file.
code -
#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, 1);
SetConsoleTitle("Calender Project - Programming-technique.blogspot.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-
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