undefined reference to

[adam2016]

Hey guys first off please bare with me the code is quite long but I will note that the error occurs in the initAge function so most of the code you can ignore its the initAge function that is giving me the problems,it is telling me I have an undefined reference,I'm not sure why I'm getting this error

I have been working on a calender project for the last 3 hours and have can't seem to figure this out I've never really experienced this issue before

obj\Release\main.o:main.cpp:(.text.startup+0x251)||undefined reference to `Dates::initAge(Dates::Date&)'|

main.cpp

#include <iostream>
#include <Date.h>
#include <stdlib.h>

using namespace std;

int main()
{
    Dates::Date today(3,Dates::MAR,Year(2018));
    int months = Dates::nextDecember(today);

    cout << today.getMonth() << endl;
    cout << months << " months until December" << endl;

    int day;
    int monthInt;
    int yearInt;
    int choice;

    cout << "enter the day of the month" << endl;
    cin >> day;

    cout << "enter the month of the year" << endl;
    cin >> monthInt;
    Dates::Month month = Dates::Month(+monthInt);

    cout << "enter the year" << endl;
    cin >> yearInt;
    Year year(yearInt);

    Dates::Date todaysDate(day,month,year);
    Dates::initAge(todaysDate);

    while(true)
    {

        cout << "press 1 to skip a day" <<
             "press 2 to skip a month" <<
             "press 3 to skip a year" <<
             "press 4 to display todays date" <<
             "press 5 to quit" << endl;

        cin >> choice;

        switch(choice)
        {

        case 1:
            Dates::nextDay(todaysDate);
            break;
        case 2:
            Dates::nextMonth(todaysDate);
            break;
        case 3:
            Dates::nextYear(todaysDate);
            break;
        case 4:
            system("cls");
            Dates::checkBirthday(todaysDate);
            Dates::checkChristmas(todaysDate);
            Dates::checkNewYears(todaysDate);
            cout << todaysDate.getDay() << "/"  << todaysDate.getMonth() <<
                 "/"  <<  todaysDate.getYear().y << endl;
            break;
        case 5:
            break;
        case 6:
            Dates::previousDay(todaysDate);
            break;
        case 7:
            Dates::previousMonth(todaysDate);
            break;
        case 8:
            Dates::previousYear(todaysDate);
            break;
        default:
            cout << "invalid choice please re enter";
        }
    }
}
  

Date.h

#ifndef DATE_H
#define DATE_H
#include <Year.h>

namespace Dates
{

enum Month
{

    JAN = 1,
    FEB,
    MAR,
    APR,
    MAY,
    JUN,
    JUL,
    AUG,
    SEP,
    OCT,
    NOV,
    DEC
};

class Date
{
public:
    Date();
    Date(int d,Month m,Year y);
    Date(const Date& other);
    virtual ~Date();
    void setAge(int a);
    int getDay() const;
    Month getMonth() const;
    Year getYear() const;
    void setDay(int day);
    void setMonth(Month month);
    void setYear(Year year);
    void incrementAge(Date& d);

protected:

private:
    int day;
    Month month;
    Year year;
    int age;
};

bool operator==(const Date& one,const Date& two);
void initAge(Date& d);
int nextDecember(const Date& d);
void nextDay(Date& d);
void nextMonth(Date& m);
void nextYear(Date& yr);
void previousDay(Date& d);
void previousMonth(Date& d);
void previousYear(Date& d);
void checkChristmas(Date& d);
void checkBirthday(Date& d);
void checkNewYears(Date& d);

}
#endif // DATE_H

  

Date.cpp

#include "Date.h"
#include <iostream>

using namespace std;

namespace Dates
{

Date::Date()
{
    day = 1;
    month = JAN;
    Year temp(1970);
    year = temp;
}

Date::Date(int d,Month m,Year y)
    : day(d),month(m),year(y)
{
    age = 0;
}

Date::Date(const Date& other){

  this->day = other.day;
  this->month = other.month;
  this->year = other.year;
}

void Date::setAge(int a){

   age = a;
}

int Date::getDay() const
{
    return day;
}
Month Date::getMonth()const
{

    return month;
}
Year Date::getYear()const
{

    return year;
};

void Date::setDay(int day){

   this->day = day;
}

void Date::setMonth(Month month){

  this->month = month;
}

void Date::setYear(Year year){

  this->year = year;
}

Date::~Date()
{
    //dtor
}

bool operator==(const Date& one,const Date& two)
{

    return one.getDay() == two.getDay() && one.getMonth() == two.getMonth() && one.getYear().y == two.getYear().y;
}

void initDate(Date& d){

//    if(d.getDay() < 19 && d.getMonth() < SEP && d.getYear().y < 1991){
//        d.setAge(-1);
//
//    }
//    if(d.getDay() >= 19 && d.getMonth() >= SEP && d.getYear().y == 1991){
//
//       d.setAge(0);
//    }
////    else{
////    Date tempDate = d;
////    cout << tempDate.getDay() << "/" << tempDate.getMonth() << "/" << tempDate.getYear().y << endl;
////    int tempAge = 0;
////
////    while(tempDate.getYear().y != 1991){
////
////       previousDay(tempDate);
////       if(tempDate.getDay() == 19 && tempDate.getMonth() == SEP){
////         tempAge++;
////         d.setAge(tempAge);
////       }
////    }
////    }

}

int nextDecember(const Date& d){

   int s = d.getMonth();
   int count = 0;
   cout << "debug" << s << endl;

   if(s == DEC){

       return count;
   }
   for(int i = s; i <= DEC; i++){

      count++;

      if(i == DEC){

        return count-1;
      }
   }
}

void nextYear(Date& yr){

  int year = (yr.getYear().y)+1;
  yr.setYear(Year(year));
}

void nextMonth(Date& m){

   Month month = m.getMonth();
   if(month == 12){
     m.setDay(1);
     m.setMonth(JAN);
     nextYear(m);
   }
   else{
   m.setMonth(Month(month+1));
   }
}

void nextDay(Date& d){

   int day = d.getDay();
   day++;
   if(day > 31){

    day = 1;
    nextMonth(d);
   }
   d.setDay(day);
}

void previousDay(Date& d){

   int day = d.getDay();
   day--;
   if(day < 1){

    day = 31;
    previousMonth(d);
   }
   d.setDay(day);
}

void previousMonth(Date& d){

  Month month = d.getMonth();

  if(month == 1){

    d.setDay(31);
    month = DEC;
    previousYear(d);

  }else{

    d.setMonth(Month(month-1));
  }
}

void previousYear(Date& d){

   int yr = d.getYear().y;
   yr--;
   d.setYear(yr);

}

void checkChristmas(Date& d){

 if(d.getDay() == 25 && d.getMonth() == DEC){

     cout << "It's Christmas,Merry Christmas!" << endl;
 }

}
void checkBirthday(Date& d){

if(d.getDay() == 19 && d.getMonth() == SEP){

     cout << "Happy Birthday!" << endl;
 }

}

void checkNewYears(Date& d){

   if(d.getDay() == 1 && d.getMonth() == JAN){

     cout << "HAPPY NEW YEAR!" << endl;
 }

}

}
  

thanks

[Peter87]

"undefined reference" means it can't find the definition of the function. If you haven't defined it anywhere that's what you need to do.

[E0p9LyTq]

In Date.h, line 51:
void initAge(Date& d);

In Date.cpp. line 77:
void initDate(Date& d)

-------------

None of the stand-alone functions declared in your header file inside your custom namespace are properly qualified in your cpp file.

For instance, instead of void initAge(Date& d) it must be defined as void Dates::initAge(Date& d)

ALL of your non-class functions need the Dates:: qualifier.

[jlb]

ALL of your non-class functions need the Dates:: qualifier.

All of those functions are being implemented inside the Dates namespace in that source file so they shouldn't need to be fully qualified. They will however need to be fully qualified in the main.cpp since there is no using statements for those functions in that source file.

[E0p9LyTq]

I missed the custom namespace use in the cpp file.

[adam2016]

thanks guys yeah it was a declaration mistake I had initDate instead of initAge

for a moment I thought something was wrong with the linker haha

thanks :)