In this article, you will learn how to write a C program to display a month-by-month calendar for a given year. I have already written a code to display a calendar for the given month and year. This code compiles in Code Blocks with the GCC compiler.
The following is a C program to display a month-by-month calendar for a given year.
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
//check leap year
#define IS_LEAP_YEAR(Year) \
((Year%4==0 && Year%100 != 0)||Year%400==0)
/*Function returns the index of the days
of the given month and year using ZELLER'S ALGORITHM
For e.g-
Index Day
0 Sunday
1 Monday
2 Tuesday
3 Wednesday
4 Thursday
5 Friday
6 Saturday*/
int getZeller(int Month,int Year)
{
int Day = 1, ZMonth, ZYear, Zeller;
if(Month < 3)
ZMonth = Month+10;
else
ZMonth = Month-2;
if(ZMonth > 10)
ZYear = Year-1;
else
ZYear = Year;
Zeller = ((int)((13*ZMonth-1)/5)+Day+ZYear%100+
(int)((ZYear%100)/4)-2*(int)(ZYear/100)+
(int)(ZYear/400)+77)%7;
return Zeller;
}
/* A Function to return the number of days in
a month
Month Number Name Number of Days
0 January 31
1 February 28 (non-leap) / 29 (leap)
2 March 31
3 April 30
4 May 31
5 June 30
6 July 31
7 August 31
8 September 30
9 October 31
10 November 30
11 December 31
*/
int getNumberOfDays(int monthNumber, int year)
{
int MonthDay[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
MonthDay[monthNumber-1] += (IS_LEAP_YEAR(year) && (monthNumber == 2));
return (MonthDay[monthNumber-1]);
}
//Align the message
void printMessageCenter(const char* message)
{
int len =0;
int pos = 0;
//calculate how many space need to print
len = (78 - strlen(message))/2;
printf("\t\t\t");
for(pos =0 ; pos < len ; pos++)
{
//print space
printf(" ");
}
//print message
printf("%s",message);
}
// Function to print the calendar of the given year
void printCalendar(int month,int year)
{
//get month name
char * months[] = {"January", "February", "March",
"April", "May", "June",
"July", "August", "September",
"October", "November", "December"
};
int j,k;
int days;
// Index of the day from 0 to 6
int current = getZeller(month,year);
days = getNumberOfDays (month, year);
printf("\n\n\t\t%s\n", months[month-1]);
// Print days in the columns
printf(" Sun Mon Tue Wed Thu Fri Sat\n");
// Print appropriate spaces
for (k = 0; k < current; k++)
printf(" ");
//print days as per the month
for (j= 1; j <= days; j++)
{
printf("%5d", j);
++k; //change new line for each week
if (k > 6)
{
k = 0;
printf("\n");
}
}
if (k)
printf("\n");
current = k;
}
void headMessage(const char *message)
{
system("cls");
printf("\t\t\t#################################################################");
printf("\n\t\t\t############ ############");
printf("\n\t\t\t############ C Project: Calendar For Given Month. ############");
printf("\n\t\t\t############ #######");
printf("\n\t\t\t#################################################################");
printf("\n\t\t\t------------------------------------------------------------------\n");
printMessageCenter(message);
printf("\n\t\t\t-------------------------------------------------------------------");
}
void welcomeMessage()
{
headMessage("www.aticleworld.com");
printf("\n\n\n\n\n");
printf("\n\t\t\t **-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**\n");
printf("\n\t\t\t =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=");
printf("\n\t\t\t = Program =");
printf("\n\t\t\t = Shows =");
printf("\n\t\t\t = calendar of a =");
printf("\n\t\t\t = Given Month =");
printf("\n\t\t\t = =");
printf("\n\t\t\t =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=");
printf("\n\t\t\t **-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**-**\n");
printf("\n\n\n\t\t\t Enter any key to continue.....");
getchar();
system("cls");
printf("\n\tThis program shows calendar of a given month.\n\n");
}
void printCalendarGivenYear(int year)
{
int month;
const int monthInYear = 12;
char buf[32] = {0};
sprintf(buf,"%s%d\n\n","Calendar - ",year);
printMessageCenter(buf);
for(month = 1; month < monthInYear; ++month)
{
printCalendar(month,year);
}
}
int main()
{
int Month, Year;
welcomeMessage();
//validate input
while(1)
{
fflush(stdin);
printf("Enter the Year YYYY = ");
scanf("%d",&Year);
if(Year < 0)
{
printf("\nInvalid year value...");
continue;
}
if(Year < 100)
Year += 1900;
if(Year < 1582 || Year > 4902)
{
printf("\nInvalid year value...\n");
printf("Enter the Year between 1582-4902\n\n");
continue;
}
break;
} /*Break loop after valid input*/
//clean console
system("cls");
do
{
printCalendarGivenYear(Year);
//Display message
printf("\n\n\t\t(*) Press Up Arrow for Next Year.");
printf("\n\n\t\t(*) Press Down Arrow for Previous Year.");
printf("\n\n\t\t(*) Press ESC for Exit.\n\n\n\t\t");
char KeyCode = getchar(); /* getting Key Code */
if(KeyCode == 72) /* Up Arrow */
Year++;
if(KeyCode == 80) /* Down Arrow */
Year--;
if(KeyCode == 27) /* Esc button */
{
system("cls");
printf("\n\n\n\n\n\t\tBye Bye ...");
printf("\n\t\tThanks for reading Aticleworld\n\n\n\n\n\n");
exit(1);
}
system("cls");
}
while(1);
return (0);
}
Output:
Calendar - 2023
January
Sun Mon Tue Wed Thu Fri Sat
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31
February
Sun Mon Tue Wed Thu Fri Sat
1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28
March
Sun Mon Tue Wed Thu Fri Sat
1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31
April
Sun Mon Tue Wed Thu Fri Sat
1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30
May
Sun Mon Tue Wed Thu Fri Sat
1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
June
Sun Mon Tue Wed Thu Fri Sat
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30
July
Sun Mon Tue Wed Thu Fri Sat
1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31
August
Sun Mon Tue Wed Thu Fri Sat
1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31
September
Sun Mon Tue Wed Thu Fri Sat
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
October
Sun Mon Tue Wed Thu Fri Sat
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31
November
Sun Mon Tue Wed Thu Fri Sat
1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30
(*) Press Up Arrow for Next Year.
(*) Press Down Arrow for Previous Year.
(*) Press ESC for Exit.
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