Thread: Undeclared Identifier

This date program is supposed to take in the written date

Code:

Date g( January, 12, 1994 ); // written date

and convert it, displaying it as 01/12/94 and 12/1994 (ordinal, or as some call it, Julian). I'm getting the error "January, undeclared identifier". I'm not sure what is wrong? Thanks in advance for any info.

Code:

#include <iostream>
#include <iomanip> // for setfill and setw
#include <cstring> // for strings

using namespace std;

class Date // typically stored in header file date1.h
{
   public:
      Date( const char* , int , int ); // constructor for January 15, YYYY
      void printJulian() const;  // print date in DDD YYYY format
      void printMDY() const;  // print date in MM/DD/YY
      void printLong() const;  // print date something like June 14, 2006
      ~Date();  // provided to confirm destruction order
	     
   private:
      int month;
      int day;
      int year;
      int julian;
      int checkDay( int ) const; // function tests proper day
      int getMonthNumber( const char* ) const; // to compare January to 1 


}; // end class Date; end of date1.h header file

   const char* monthTable[13] = {"invalid","January","February","March","April","May","June","July","August","September","October","November","December"

}; // global array


Date::Date(const char* _month, int _day, int _year) // untested
{
   year = _year;                 // should validate yr
   month = getMonthNumber(_month);
   day = checkDay( _day );      // validate the day
}

void Date::printJulian() const // prints as DDD YYYY (ordinal/gregorian)
{
   int calculator = 0;

   if (month == 1)
      calculator = 0;
   else if (month == 2)
      calculator = 31;
   else if (month == 3)
      calculator = 59;
   else if (month == 4)
      calculator = 90;
   else if (month == 5)
      calculator = 120;
   else if (month == 6)
      calculator = 151;
   else if (month == 7)
      calculator = 181;
   else if (month == 8)
      calculator = 212;
   else if (month == 9)
      calculator = 243;
   else if (month == 10)
      calculator = 273;
   else if (month == 11)
      calculator = 304;
   else if (month == 12)
      calculator = 334;

   int gregorian;
   gregorian = (day + calculator);
   cout << setfill('0') << setw(3) << gregorian << "/" << year;


} // end function printJulian

void Date::printMDY() const // prints as MM/DD/YY
{
   cout << setfill('0') << setw(2) << month << '/' << setw(2) << day << '/' << setw(2) << year; 

} // end function print3

void Date::printLong() const // prints, for example, March 12, 1988 - written format
{
	const char* monthArray[13] = {"null","January","February","March","April","May","June","July",
		"August","September","October","November","December"};

    cout << monthArray[month] << " " << day << ", " << year; 

} // end function print4

// output Date object to show when its destructor is called
Date::~Date()
{ 

} // end ~Date destructor

// utility function to confirm proper day value based on 
// month and year; handles leap years, too
int Date::checkDay( int testDay ) const
{
   static const int daysPerMonth[ 13 ] = 
      { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

   // determine whether testDay is valid for specified month
   if ( testDay > 0 && testDay <= daysPerMonth[ month ] )
      return testDay;

   // February 29 check for leap year 
   if ( month == 2 && testDay == 29 &&
      ( year % 400 == 0 ||                      
         ( year % 4 == 0 && year % 100 != 0 ) ) )
      return testDay;

   cout << "Day " << testDay << " invalid. Set to day 1.\n";

   return 1;  // leave object in consistent state if bad value

} // end function checkDay; end of date1.cpp

int Date::getMonthNumber(const char* _month) const
{
   int key = 0;
      for (int i = 1; i< 13;i++){
         if (!strcmp(_month,monthTable[i]))
         {
            key = i;
            break;
         }
      }
   return key;
}


int main()
{

   Date g( January, 12, 1994 ); // fourth date, written

   cout << "\nFourth date entered is: ";
   g.printLong();
    cout << "\nFourth date in DDD/YYYY (Gregorian) format: ";
   g.printJulian();
   cout << "\nFourth date in MM/DD/YY format: ";
   g.printMDY();
   cout << "\nFourth date in written format: ";
   g.printLong();
   cout << endl;

   return 0;

} // end main

Code:

Date g( January, 12, 1994 );

The function takes written date being the first argument a c-string as you can see in it's declaration:

Code:

Date( const char* , int , int );

So try calling it as:

Code:

Date g("January",12,1994);

As without the "" the compiler assumes January is the name of a variable. This ought to do the trick...

cheers

Thank you so much, yes it works! Glad to see it was simple.