C Programming (Turbo C++ Compiler) - Time Span Finding the number of days between two days
I have given here the source code for the time span.
The logic for finding leap year is applying the following two rules,
First Rule: The year divisible by 4 is a leap year.
Second Rule: If the year is divisible by 100, then it is not a leap year. But If the year is divisible by 400, then it is a leap year.
Source Code
#include <stdio.h>
#include <conio.h>
static int arrnumdays[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
static int arrleapnumdays[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
typedef enum _boolean
{
true = 1, false = 0
} bool;
bool IsLeapYear(int 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(int date, int month, int 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;
}
int GetNumDays(int begdate, int begmonth, int begyear, int enddate, int endmonth, int endyear)
{
int diffyears = endyear - begyear;
int numdays = 0;
int days = -1;
int m, y, d1, d2;
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
{
int 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;
}
int main()
{
int begdate, begmonth, begyear;
int enddate, endmonth, endyear;
char bd[128], ed[128];
int numdays;
printf("Enter Begin Date: ");
scanf("%d", &begdate);
printf("Enter Begin Month: ");
scanf("%d", &begmonth);
printf("Enter Begin Year: ");
scanf("%d", &begyear);
printf("Enter End Date: ");
scanf("%d", &enddate);
printf("Enter End Month: ");
scanf("%d", &endmonth);
printf("Enter End Year: ");
scanf("%d", &endyear);
sprintf(bd, "(DD/MM/YYYY) %02d/%02d/%04d", begdate, begmonth, begyear);
sprintf(ed, "%02d/%02d/%04d", enddate, endmonth, endyear);
numdays = GetNumDays(begdate, begmonth, begyear, enddate, endmonth, endyear);
if(numdays== -1)
printf("The start date is greater than end date\n");
else if(numdays == -2)
printf("Not a valid start date\n");
else if(numdays == -3)
printf("Not a valid end date\n");
else
printf("Number of days Between %s and %s is : %d\n", bd, ed, numdays);
return 0;
}
Output
Enter Begin Date: 6
Enter Begin Month: 2
Enter Begin Year: 1978
Enter End Date: 1
Enter End Month: 11
Enter End Year: 2010
Number of days Between (DD/MM/YYYY) 06/02/1978 and 01/11/2010 is : 11956
Press any key to continue . . .
Enter Begin Date: 31
Enter Begin Month: 2
Enter Begin Year: 2010
Enter End Date: 10
Enter End Month: 10
Enter End Year: 2010
Not a valid start date
Press any key to continue . . .
Enter Begin Date: 10
Enter Begin Month: 10
Enter Begin Year: 2010
Enter End Date: 10
Enter End Month: 10
Enter End Year: 2000
The start date is greater than end date
Press any key to continue . . .
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