Turbo C++ - Time Span Finding the number of days between two days
I have given here the source code for the time span. Given two days as input, it will count the number of days in between.
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 <iostream.h>
#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;
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(int 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(int d1 = begmonth + 1; d1 <= 12; d1++)
{
if(bLeap == true)
numdays += arrleapnumdays[d1 - 1];
else
numdays += arrnumdays[d1 - 1];
}
if(diffyears > 1)
{
for(int 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(int 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;
cout << "Enter Begin Date: ";
cin >> begdate;
cout << "Enter Begin Month: ";
cin >> begmonth;
cout << "Enter Begin Year: ";
cin >> begyear;
cout << "Enter End Date: ";
cin >> enddate;
cout << "Enter End Month: ";
cin >> endmonth;
cout << "Enter End Year: ";
cin >> endyear;
char bd[128], ed[128];
sprintf(bd, "(DD/MM/YYYY) %02d/%02d/%04d", begdate, begmonth, begyear);
sprintf(ed, "%02d/%02d/%04d", enddate, endmonth, endyear);
int numdays = GetNumDays(begdate, begmonth, begyear, enddate, endmonth, endyear);
if(numdays== -1)
cout << "The start date is greater than end date\n";
else if(numdays == -2)
cout << "Not a valid start date\n";
else if(numdays == -3)
cout << "Not a valid end date\n";
else
cout << "Number of days Between " << bd << " and " << ed << " is : " << numdays << "\n";
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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