Calculating Time Difference

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Calculating Time Difference

 
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  #1
Feb 23rd, 2007
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

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream.h>
  2. #include <cdate.h>
  3.  
  4. class Date
  5.  
  6. {
  7.  
  8. public:
  9.  
  10.  int month;
  11.  
  12.  int day;
  13.  
  14.  int year;
  15.  
  16.  static int dtab[2][13];
  17.  
  18. public:
  19.  int getMonth()
  20.  
  21.  {
  22.   return month;
  23.  }
  24.  
  25.  int getDay()
  26.  
  27.  {
  28.   return day;
  29.  }
  30.  
  31.  int getYear()
  32.  
  33.  {
  34.   return year;
  35.  }
  36.  
  37.  Date operator-(Date& d2);
  38.  
  39.  Date& operator-()
  40.  {
  41.   month=-month;
  42.  
  43.   day=-day;
  44.  
  45.   year=-year;
  46.  
  47.   return *this;
  48.  }
  49.  int compare(Date&);
  50.  
  51.  int operator<(Date& d2)
  52.  
  53.  {
  54.  
  55.   return compare{d2) < 0;
  56.  
  57.  }
  58.  
  59.  int operator<=(const Date& d2) 
  60.  
  61.     {
  62.  
  63.   return compare(d2) <= 0;
  64.  
  65.  }
  66.  
  67.    int operator>( Date& d2) 
  68.  
  69.     {
  70.  
  71.     return compare(d2) > 0;
  72.  
  73.  }
  74.  
  75.    int operator>=( Date& d2) 
  76.  
  77.      {
  78.  
  79.     return compare(d2) >= 0;
  80.  
  81.  }
  82.  
  83.    int operator==( Date& d2) 
  84.  
  85.      {
  86.  
  87.     return compare(d2) == 0;
  88.  
  89.  }
  90.  
  91.    int operator!=( Date& d2) 
  92.  
  93.      {
  94.  
  95.     return compare(d2) != 0;
  96.  
  97.  }
  98.  
  99.  static int isleap(int y)
  100.  
  101.      {
  102.  
  103.   return y%4 == 0 && y%100 != 0 || y%400 == 0;
  104.  
  105.  }
  106.  
  107.  };
  108.  
  109. int main()
  110.  
  111. {  
  112.  
  113.  Date today, d2;
  114.  
  115.  cout << "Today's date is "<< today << endl;
  116.  
  117.  cout << "Enter another date: ";
  118.  
  119.  cin >> d2;
  120.  
  121.  cout << "today -d2 = "<< today - d2 << endl;
  122.  
  123.  cout << "d2 - today = "<< d2 - today << endl;
  124.  
  125.    return 0;
  126.  
  127. }
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Re: Calculating Time Difference

 
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  #2
Feb 23rd, 2007
#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.
The 3 Laws of the Procrastination Society:
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes
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Re: Calculating Time Difference

 
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  #3
Feb 23rd, 2007
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Originally Posted by hui View Post
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

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream.h>
  2. #include <cdate.h>
  3.  
  4. class Date
  5.  
  6. {
  7.  
  8. public:
  9.  
  10.  int month;
  11.  
  12.  int day;
  13.  
  14.  int year;
  15.  
  16.  static int dtab[2][13];
  17.  
  18. public:
  19.  int getMonth()
  20.  
  21.  {
  22.   return month;
  23.  }
  24.  
  25.  int getDay()
  26.  
  27.  {
  28.   return day;
  29.  }
  30.  
  31.  int getYear()
  32.  
  33.  {
  34.   return year;
  35.  }
  36.  
  37.  Date operator-(Date& d2);
  38.  
  39.  Date& operator-()
  40.  {
  41.   month=-month;
  42.  
  43.   day=-day;
  44.  
  45.   year=-year;
  46.  
  47.   return *this;
  48.  }
  49.  int compare(Date&);
  50.  
  51.  int operator<(Date& d2)
  52.  
  53.  {
  54.  
  55.   return compare{d2) < 0;
  56.  
  57.  }
  58.  
  59.  int operator<=(const Date& d2) 
  60.  
  61.     {
  62.  
  63.   return compare(d2) <= 0;
  64.  
  65.  }
  66.  
  67.    int operator>( Date& d2) 
  68.  
  69.     {
  70.  
  71.     return compare(d2) > 0;
  72.  
  73.  }
  74.  
  75.    int operator>=( Date& d2) 
  76.  
  77.      {
  78.  
  79.     return compare(d2) >= 0;
  80.  
  81.  }
  82.  
  83.    int operator==( Date& d2) 
  84.  
  85.      {
  86.  
  87.     return compare(d2) == 0;
  88.  
  89.  }
  90.  
  91.    int operator!=( Date& d2) 
  92.  
  93.      {
  94.  
  95.     return compare(d2) != 0;
  96.  
  97.  }
  98.  
  99.  static int isleap(int y)
  100.  
  101.      {
  102.  
  103.   return y%4 == 0 && y%100 != 0 || y%400 == 0;
  104.  
  105.  }
  106.  
  107.  };
  108.  
  109. int main()
  110.  
  111. {  
  112.  
  113.  Date today, d2;
  114.  
  115.  cout << "Today's date is "<< today << endl;
  116.  
  117.  cout << "Enter another date: ";
  118.  
  119.  cin >> d2;
  120.  
  121.  cout << "today -d2 = "<< today - d2 << endl;
  122.  
  123.  cout << "d2 - today = "<< d2 - today << endl;
  124.  
  125.    return 0;
  126.  
  127. }
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Good luck, LamaBot
Last edited by Lazaro Claiborn; Feb 23rd, 2007 at 4:39 pm.
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Re: Calculating Time Difference

 
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  #4
Feb 23rd, 2007
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.

c Syntax (Toggle Plain Text) 
  1. #include <iostream.h>
  2. #include <cdate.h>
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.

c Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. #include <cdate>
Last edited by Ancient Dragon; Feb 23rd, 2007 at 6:37 pm.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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