dating function

[nrose]

im having problems with my program that needs to have the user input 2 birthdates and then determine which one is older im not to sure where to go from what i have

#include <iostream>
#include <math.h>

using namespace std;

void printDate (int date)
{ 
cout << date << endl;  
}

void getDate (int day, int month, int year)
{
cout << day "/" << month "/" << year << endl;
}

int main(void)
{

  int date1;
  int date2;
     cout << "Please enter your birthdate" << endl;
      cin >> date1;
     cout << "Please enter the birthdate of someone else" << endl;
      cin >> date2;

      cout << "Your birthday is " << getDate (date1) << endl;

return 0;
}

im having problems getting it to compile just wondering what im doing wrong and if someone can point me in the right direction

[firedraco]

You are missing a set of '<<' before each "/" in your getDate function.

[nrose]

thanks i didnt even realize that. i figured out that im supposed to use struct instead of void but it still doesnt work

#include <iostream>
#include <math.h>

using namespace std;

struct printDate {int date}
{ 
cout << date << endl;  
}

struct getDate {int day, int month, int year}
{
cout << day << "/" << month << "/" << year << endl;
}

int main(struct)
{

  int date1;
  int date2;
     cout << "Please enter your birthdate" << endl;
      cin >> date1;
     cout << "Please enter the birthdate of someone else" << endl;
      cin >> date2;

      cout << "Your birthday is " << getDate (date1) << endl;
      cout << "Your friends birthday is " << getDate (date2) << endl;
return 0;
}

[Bazzy]

You are confusing structures with functions,
see http://www.cplusplus.com/doc/tutorial/structures/ http://www.cplusplus.com/doc/tutorial/functions/

[nrose]

i fixed my program a bit but now all it does is output what i input minus the first 0 how do i get it to sort between the 2 to decide which one is older

#include <iostream>
#include <math.h>

using namespace std;

struct printDate 
{
    printDate (int dd, int mm, int yyyy):
       day(dd),month(mm),year(yyyy){}
       int day;
       int month;
       int year;
};

struct getDate
{ getDate( int dd, int mm, int yyyy):
    day(dd),month(mm),year(yyyy){}
        
}

int main()
{

  int date1;
  int date2;
     cout << "Please enter your birthdate" << endl;
      cin >> getDate >> date1;
     cout << "Please enter the birthdate of someone else" << endl;
      cin >> getDate >> date2;

      cout << "Your birthday is " << (date1) << endl;
      cout << "Your friends birthday is " << (date2) << endl;
      if (date1> date2)
      cout << "You are older then your friend" << endl;
      else 
      cout << "Your friend is older then you" << endl;
return 0;
}

[Ashden]

Well, how do YOU compare to dates?

Compare the years. The lesser is older. If they are equal, compare the months. The lesser is older. If they are equal, compare the day. The lesser is older.

That's how the human brain does it too, we just take it for granted. You have to "tell" your computer those steps. ;)

[PanGalactic]

The nice thing about ISO date format (http://en.wikipedia.org/wiki/ISO_8601) is that the dates can be easily ordered as strings.

strptime() and strftime() can parse and format dates respectively. Or you can use the Boost Date/Time library to do that too.

[lloydchristmas759]

Although PanGalactic is correct about ISO date format, Boost etc, I think nrose is rather trying to learn the basic concepts of C++.

As Bazzy pointed out, you are probably confusing structures, classes and functions.

What you probably want, is to define a structure that represents a date, with methods to compare and print dates:

#include <iostream>
#include <string>
#include <sstream>

struct Date
{
    unsigned int day, month, year;

    // returns:  1 if other_date is older than this date
    //          -1 if this date is older than other_date
    //           0 if this date is equal to other_date
    int compare(Date& other_date)
    {
        if (year > other_date.year) return 1;
        if (year < other_date.year) return -1;
        if (month > other_date.month) return 1;
        if (month < other_date.month) return -1;
        if (day > other_date.day) return 1;
        if (day < other_date.day) return -1;
        return 0;
    }
    
    std::string to_string()
    {
        std::ostringstream s;
        s << day << "/" << month << "/" << year;
        return s.str();
    }
};

int main()
{
    Date date1, date2;
    std::cout << "Enter your birthdate (DD MM YYYY): " << std::endl;
    std::cin >> date1.day >> date1.month >> date1.year;
    std::cout << "Enter someone else's birthdate (DD MM YYYY): " << std::endl;
    std::cin >> date2.day >> date2.month >> date2.year;
    
    std::cout << "Your birthdate: " << date1.to_string() << std::endl;
    std::cout << "His birthdate : " << date2.to_string() << std::endl;
    
    std::cout << "You are ";
    switch(date1.compare(date2))
    {
        case -1: std::cout << "older"; break;
        case  1: std::cout << "younger"; break;
        case  0: std::cout << "equal"; break;
    }
    std::cout << std::endl;
}

[PanGalactic]

This is the general forum. People get general answers here. People wanting basics, well... (to usurp a phrase from Apple) "there's a forum for that."