C Programming (Turb C++ Compiler) Displaying Monthly Calendar Given any Date from year 1900
I have given here a C Program for Displaying Monthly Calendar Given any Date from year 1900. It will validate the leap year and it will display the day (Monday, Tuesday, ...) correctly along with a * mark for the given date.
Source Code
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static long arrnumdays[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
static long arrleapnumdays[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
typedef enum _boolean {
false, true
} bool;
bool IsLeapYear(long year)
{
if((year % 4) == 0)
{
if((year % 100) == 0)
{
if( (year % 400) == 0)
return true;
else
return false;
}
else
return true;
}
return false;
}
bool CheckDate(long date, long month, long year)
{
if(year < 0 || year > 10000)
return false;
if(month < 1 || month > 12)
return false;
if(date < 1 || date > 31)
return false;
if(IsLeapYear(year) == true)
{
if( date > arrleapnumdays[month-1])
return false;
}
else
if( date > arrnumdays[month-1])
return false;
return true;
}
long GetNumDays(long begdate, long begmonth, long begyear, long enddate, long endmonth, long endyear)
{
long diffyears = endyear - begyear;
long numdays = 0;
long days = -1;
long m, diffmonth, d1, d2, y;
bool bLeap = false;
if(diffyears < 0)
return -1; // The start date is greater than end date
if( CheckDate(begdate, begmonth, begyear) == false)
return -2; // Not a valid start date
if(CheckDate(enddate, endmonth, endyear) == false)
return -3; // Not a valid end date
if(diffyears == 0) // same year
{
diffmonth = endmonth - begmonth;
if(diffmonth < 0)
return -1; // The start date is greater than end date
if(diffmonth == 0)
{
numdays = enddate - begdate;
if(numdays < 0)
return -1; // The start date is greater than end date
return numdays;
}
else
{
bLeap = IsLeapYear(begyear);
// Beg date of end of Beg month
if(bLeap == true)
days = arrleapnumdays[begmonth - 1];
else
days = arrnumdays[begmonth - 1];
numdays += days - begdate;
if(diffmonth > 1)
{
for(m = begmonth + 1; m <= endmonth - 1; m++)
{
if(bLeap == true)
numdays += arrleapnumdays[m - 1];
else
numdays += arrnumdays[m - 1];
}
}
// Beg of End month to End date
numdays += enddate;
}
}
else
{
// Beg Date to end of beg year (Dec 31, YYYY)
bLeap = IsLeapYear(begyear);
if(bLeap == true)
days = arrleapnumdays[begmonth - 1];
else
days = arrnumdays[begmonth - 1];
numdays += days - begdate;
for(d1 = begmonth + 1; d1 <= 12; d1++)
{
if(bLeap == true)
numdays += arrleapnumdays[d1 - 1];
else
numdays += arrnumdays[d1 - 1];
}
if(diffyears > 1)
{
for(y = begyear + 1; y <= endyear - 1; y++)
{
if(IsLeapYear(y) == true)
numdays += 366;
else
numdays += 365;
}
}
// Beg of End Year (Jan 01, YYYY) to End Date
bLeap = IsLeapYear(endyear);
for(d2 = 1; d2 <= endmonth - 1; d2++)
{
if(bLeap == true)
numdays += arrleapnumdays[d2 - 1];
else
numdays += arrnumdays[d2 - 1];
}
numdays += enddate;
}
return numdays;
}
long main()
{
static char *strDayOfWeek[] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
static char *strMonthName[] = {
"Jan", "Feb", "Mar", "Apr",
"May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec",
};
char bd[128], ed[128];
char buf[32];
long i, j;
long begdate, begmonth, begyear;
long enddate, endmonth, endyear;
long numdays1, numdays2, numdays;
long dayofweek1, dayofweek2;
long *pdaysinmonth = 0;
begdate = 1;
begmonth = 1;
begyear = 1900; // Sunday
::system("cls");
printf("Enter Date: ");
scanf("%ld", &enddate);
printf("Enter Month: ");
scanf("%ld", &endmonth);
printf("Enter Year: ");
scanf("%ld", &endyear);
sprintf(bd, "(DD/MM/YYYY) %02d/%02d/%04d", begdate, begmonth, begyear);
sprintf(ed, "%02d/%02d/%04d", enddate, endmonth, endyear);
numdays1 = GetNumDays(begdate, begmonth, begyear, 1, endmonth, endyear);
dayofweek1 = (numdays1 + 1) % 7;
if(numdays1 < 0)
{
if(numdays1 == -1)
printf("The start date is greater than end date\n");
else if(numdays1 == -2)
printf("Not a valid start date\n");
else if(numdays1 == -3)
printf("Not a valid end date\n");
return 0;
}
numdays2 = GetNumDays(begdate, begmonth, begyear, enddate, endmonth, endyear);
dayofweek2 = (numdays2 + 1) % 7;
pdaysinmonth = ( IsLeapYear(endyear)) ? arrleapnumdays : arrnumdays;
numdays = pdaysinmonth[endmonth - 1];
printf("\n\n");
printf("\t%s %ld\n\n",strMonthName[endmonth - 1], endyear);
printf(" S M T W T F S\n");
for(j = 0; j < dayofweek1; j++)
printf(" ");
for(i = 0; i < numdays; i++)
{
if(i + 1 == enddate)
sprintf(buf, " %ld*", i + 1);
else
sprintf(buf, " %ld ", i + 1);
if(i < 9)
strcat(buf, " ");
printf(buf);
if( (i + 1 + dayofweek1) % 7 == 0)
printf("\n");
}
printf("\n\n");
return 0;
}
Click here to get the Turbo C Source code and executable
Output
Enter Date: 15
Enter Month: 12
Enter Year: 2010
Dec 2010
S M T W T F S
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
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