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Join Date: Nov 2006
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Newbie Poster
Calculating Time Difference Hi guys..I am trying to make a program that can calculate the time difference in days from the current date..here is my code...it is bringing some bit of a problem...please help me out!Thanks
#include <iostream.h>
#include <cdate.h>
class Date
{
public:
int month;
int day;
int year;
static int dtab[2][13];
public:
int getMonth()
{
return month;
}
int getDay()
{
return day;
}
int getYear()
{
return year;
}
Date operator-(Date& d2);
Date& operator-()
{
month=-month;
day=-day;
year=-year;
return *this;
}
int compare(Date&);
int operator<(Date& d2)
{
return compare{d2) < 0;
}
int operator<=(const Date& d2)
{
return compare(d2) <= 0;
}
int operator>( Date& d2)
{
return compare(d2) > 0;
}
int operator>=( Date& d2)
{
return compare(d2) >= 0;
}
int operator==( Date& d2)
{
return compare(d2) == 0;
}
int operator!=( Date& d2)
{
return compare(d2) != 0;
}
static int isleap(int y)
{
return y%4 == 0 && y%100 != 0 || y%400 == 0;
}
};
int main()
{
Date today, d2;
cout << "Today's date is "<< today << endl;
cout << "Enter another date: ";
cin >> d2;
cout << "today -d2 = "<< today - d2 << endl;
cout << "d2 - today = "<< d2 - today << endl;
return 0;
}
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Join Date: May 2006
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#1: You don't need to double space everything. It's too hard to read.
#2: You need to indent consistently, and 3-4 spaces, not 1 or 2
#3: "it is bringing some bit of a problem" has no meaning. What is the problem. Describe it, don't make us guess.
#2: You need to indent consistently, and 3-4 spaces, not 1 or 2
#3: "it is bringing some bit of a problem" has no meaning. What is the problem. Describe it, don't make us guess.
Age is unimportant -- except in cheese
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Junior Poster
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Originally Posted by hui 
Hi guys..I am trying to make a program that can calculate the time difference in days from the current date..here is my code...it is bringing some bit of a problem...please help me out!Thanks
#include <iostream.h> #include <cdate.h> class Date { public: int month; int day; int year; static int dtab[2][13]; public: int getMonth() { return month; } int getDay() { return day; } int getYear() { return year; } Date operator-(Date& d2); Date& operator-() { month=-month; day=-day; year=-year; return *this; } int compare(Date&); int operator<(Date& d2) { return compare{d2) < 0; } int operator<=(const Date& d2) { return compare(d2) <= 0; } int operator>( Date& d2) { return compare(d2) > 0; } int operator>=( Date& d2) { return compare(d2) >= 0; } int operator==( Date& d2) { return compare(d2) == 0; } int operator!=( Date& d2) { return compare(d2) != 0; } static int isleap(int y) { return y%4 == 0 && y%100 != 0 || y%400 == 0; } }; int main() { Date today, d2; cout << "Today's date is "<< today << endl; cout << "Enter another date: "; cin >> d2; cout << "today -d2 = "<< today - d2 << endl; cout << "d2 - today = "<< d2 - today << endl; return 0; }
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Good luck, LamaBot
Last edited by Lazaro Claiborn : Feb 23rd, 2007 at 3:39 pm.
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Join Date: Aug 2005
Location: near St Louis, Missouri, USA
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difference in days between two dates is very easy to calculate.
1. get time_t for first date. If this is not today's date, then fill out a struct tm with day, month-1, year-1900 -- make all other structure members 0, then pass your struct tm object to mktime(), which will convert it to time_t.
2. get time_t for second date
3. subtract them -- this is difference between two dates in seconds
4. there are 24 * 60 * 60 seconds in one day. So take the result of step 3 above and divide by the number of seconds in one day.
5. finished.
1. iostream.h is very old and obsolete. current version does not have .h file extension. If you are using an acient compiler such as Turbo C++ then this is ok because your compiler probably does not support the new file naming convention.
2. cdate.h -- there is no such file. use either date.h or cdate (no file extension). This is how it might appear for modern compilers.
1. get time_t for first date. If this is not today's date, then fill out a struct tm with day, month-1, year-1900 -- make all other structure members 0, then pass your struct tm object to mktime(), which will convert it to time_t.
2. get time_t for second date
3. subtract them -- this is difference between two dates in seconds
4. there are 24 * 60 * 60 seconds in one day. So take the result of step 3 above and divide by the number of seconds in one day.
5. finished.
c Syntax (Toggle Plain Text)
2. cdate.h -- there is no such file. use either date.h or cdate (no file extension). This is how it might appear for modern compilers.
c Syntax (Toggle Plain Text)
Last edited by Ancient Dragon : Feb 23rd, 2007 at 5:37 pm.
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