Write the declaration for a Date object

Sosy · #1 25-Oct-2007, 07:14

the Question was:

a.Write the declaration for a Date object.

The user should be able to instantiate an object as the following:

Date date_1; //current date or Date date_2(01,02,2006);

The Date object should contain the following functions:

-Set the day, month and year. The values should be validated. (assume all months have 30 days)

-Get a string format of the date: day, month and year of the object in one function.

-Print the next date of the date object..

-Print the birth date in the format dd-mm-yyyy.

-Calculate age member function that takes one object parameter of type Date and return the difference between the invoking object (current date) and the passed object (birth date) as a number of days.

Test your class by creating 2 Date objects: today's date and your birth date, then write a menu that allows the user to use the above functions on your birth date i.e. the second date.

ive start solve it:

CPP / C++ / C Code:

class Date()
{
private:
	int day,month,year;//the current date.
public:

	Date(int d,int m,int y)
	{
		day=d;
		month=m;
		year=y;//the current day..
		}

void setDate()
{
	int d_birth,m_birth,y_birth;//date of birth..
	cout<<"enter ur birth day:";
	cin>>d_birth;

	if (d_birth<0 || d_birth>30)
		cout<<"enter ur birth day agin please:";
	cout<<"enter ur birth month:";
	cin>>m_birth;

	if (m_birth<0 || d_birth>12)
		cout<<"enter ur birth month agin please:";

	cout<<"enter ur birth year:";
	cin>>y_birth;

}

string getDate()
{
// i dont know how to convert from int to string :(
}


};

but idont know if i should use pointer or array..?

fakepoo · #2 25-Oct-2007, 10:24

This is a simple way to convert it to a string using sprintf().

CPP / C++ / C Code:

string getDate()
{ // make it larger than 11 just in case you have large invalid numbers  
  char cString[64] = "";
   
  sprintf(cString,"%02d-%02d-%04d",month,day,year);
  return string(cString);
}

There might be a different way using some kind of << operator into a stream, then converting it to a string. I don't know.

Do you need to use an array or pointer for what?

Sosy · #3 25-Oct-2007, 21:54

i'll be right back :shy:

Sosy · #4 25-Oct-2007, 23:00

ok, this is the final answer.. and i hope its good :/

CPP / C++ / C Code:

#include <iostream>
#include <Cstring>

using namespace std;



class Date
{
   private:
	int day,month,year;//the current date.
   public:

	   int d_birth,m_birth,y_birth;//date of birth..

	Date(int d,int m,int y)
	{
		day=d;
		month=m;
		year=y;//the current day..
	}

void setDate()
{
	cout<<"enter ur birth day:";
	cin>>d_birth;

	if (d_birth<0 || d_birth>30)
		cout<<"enter ur birth day agin please:";
	cout<<"enter ur birth month:";
	cin>>m_birth;

	if (m_birth<0 || d_birth>12)
		cout<<"enter ur birth month agin please:";

	cout<<"enter ur birth year:";
	cin>>y_birth;

}


string getDate()
{ 
  char cString[64] = "";
   
  sprintf(cString,"%02d-%02d-%04d",month,day,year);
  return string(cString);
}

void nextDay()
{
	

    if (day>=30)
	{
		day=1;
      	month++;
	}
	else
		day++;

	if (month>12)
	{
		month=1;
	    year++;
	}

	cout<<day<<"-"<<month<<"-"<<year;
}

void print()
{

	if (day<10)
       cout<<"0"<<day;
	if (month<10)
		cout<<"0"<<month;

	cout<<day<<"-"<<month<<"-"<<year;

}

void age()
{

	int age=0,d_dif,m_dif,y_dif,d_m_dif,d_y_dif;

    d_dif=day - d_birth;
	m_dif=month - m_birth;
	y_dif=year - y_birth;

	d_m_dif=m_dif*30;
    d_y_dif=y_dif*360;

	age=d_dif + d_m_dif + d_y_dif;

	cout<<age;

}


};

int main()
{ 
	Date currnt(26,10,2007);
    int s;

	do
	{
    cout<<endl<<"Menu:"<<endl;
	cout<<"1-Set Date"<<endl;
	cout<<"2-Get string format"<<endl;
    cout<<"3-Print the next day"<<endl;
	cout<<"4-Print the birth day in the format dd-mm-yyyy"<<endl;
	cout<<"5-Calculate age"<<endl;
	cout<<"choose One of this menu or '-1' to exit:"<<endl;
	cin>>s;



	switch(s)
	{
	case 1:
		currnt.setDate();
		break;

    case 2:
	    currnt.getDate();
		break;

	case 3:
		currnt.nextDay();
		break;

	case 4:
		currnt.print();
		break;

	case 5:
		currnt.age();
		break;

	case -1:
		break;

	}
	}while (s != -1);

	return 0;
}

when i ask him to Get a string format he doesnt return anything..
is it the string library wrong?

hope u test this program and tell me if i need to fix something or not..

Sosy · #5 25-Oct-2007, 23:06

fakepoo

Quote:

sprintf().

could u please explain how it work, or what is it doing?

Quote:

Do you need to use an array or pointer for what?

i dont know, but i think there is way to acsess to the private varible by using pointer..

than u very much for ur help..

fakepoo · #6 26-Oct-2007, 08:56

sprintf() is an old C function for formatting strings. Basically, if you had a variable called count that is of type int and you wanted to print a message that said "The count is X" where X is the value of count, you would have to use something like sprintf() when dealing with char*-type strings. Here are the basics:

sprintf( char* Destination, char* Format,[list of arguments, separated by commas)

Destination - the string to print into.
Format - the string containing the desired format.

When creating the format string, you can put any text you want. At the place where you want to insert the value of a variable, you put a % sign followed by a specifier. The specifier depends on the variable data type. For an integer, the specifier is 'd'.

So, for our example above, you would do it like this:

CPP / C++ / C Code:

int count = 6;
char dest[32] = "";
sprintf( dest, "The count is %d", count );
// now, dest = "The count is 6"

If you wanted to add more variables, then put another %[specifier] into the format string and the variable as an additional argument. For example:

CPP / C++ / C Code:

int oldCount = 6;
int newCount = 7
char dest[32] = "";
sprintf( dest, "The old count was %d, the new count is %d", oldCount, newCount );
// now, dest = "The old count was 6, the new count is 7"

For more information about using sprintf(), see:

http://www.cplusplus.com/reference/c...o/sprintf.html

and search "sprintf".

Good luck!
~fakepoo

Kimmo · #7 26-Oct-2007, 10:21

Quote:

Originally Posted by fakepoo

For more information about using sprintf(), see:

For information on stringstream, search the same site for "stringstream."

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