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[SOLVED] LNK2019 unresolved external symbol

gunman353 (23)
I've searched the forms for common causes of this problem, but have not been able to find any misspelled calls.

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1>Lab05a.obj : error LNK2019: unresolved external symbol "public: __thiscall
 Animals::Animals(void)" (??0Animals@@QAE@XZ) referenced in function "void __cdecl 
addData(class std::vector<class Animals,class std::allocator<class Animals> > &)" (?
addData@@YAXAAV?$vector@VAnimals@@V?$allocator@VAnimals@@@std@@@std@@@Z)


1>Animals.obj : error LNK2019: unresolved external symbol "public: __thiscall 
Animals::Animals(void)" (??0Animals@@QAE@XZ) referenced in function "void __cdecl 
`dynamic initializer for 'Animal''(void)" (??__EAnimal@@YAXXZ)


Lab05a.cpp
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#include "Animal.h"
#include <string>
#include <iostream>
#include <vector>
using namespace std;

void addData(vector <Animals> & AnimalData);
void deleteData(vector <Animals> & AnimalData);
void displayData(vector <Animals> & AnimalData);
void displayAllData(const vector <Animals> & AnimalData);


int main()
{
	int choice;
	vector <Animals> AnimalData; // Vector to hold all of the animal information

	do
	{
		cout << "\n1) Add an animal";
		cout << "\n2) Delete an animal";
		cout << "\n3) Search for an animal";
		cout << "\n4) Display all animals";
		cout << "\n5) Exit and kill all animals";
		cin >> choice;

		switch (choice)
		{
		case 1:
			addData(AnimalData);
			break;
		case 2:
			deleteData(AnimalData);
			break;
		case 3: 
			displayData(AnimalData);
			break;
		case 4:
			displayAllData(AnimalData);
			break;
		case 5:
			system("pause");
			return 0;
		default:
			cout << "\nInvalid Choice!";
		}

	} while (choice != 5);

	system("pause");
	return 0;
}


void addData(vector <Animals> & AnimalData)
{
	string name;
	double age;
	Animals newAnimal;

	cout << "\nEnter the name of the animal: ";
	cin >> name;
	newAnimal.setName(name);


	cout << "\nEnter the age of the animal: ";
	cin >> age;
	newAnimal.setAge(age);

	AnimalData.push_back(newAnimal); // adds newAnimal to AnimalData
}


void deleteData(vector <Animals> & AnimalData)
{
	//
}

void displayData(vector <Animals> & AnimalData)
{
	//
}

void displayAllData(const vector <Animals> & AnimalData)
{
	//
}


Animals.cpp
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#include "Animal.h"
#include <iostream>
#include <string>
#include <vector>

using namespace std;

Animals Animal;

void Animals::setName(string n)
{
	name = n;
}

string Animals::getName() const
{
	return name;
}

void Animals::setAge(double a)
{
	age = a;
}

double Animals::getAge() const
{
	return age;
}


Animal.h
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#ifndef ANIMAL_H
#define ANIMAL_H
#include <iostream>
#include <string>
#include <vector>

using namespace std;

class Animals
{
private:
	double age;
	string name;
public:
	Animals();
	void setAge(double);
	void setName(string);

	double getAge() const;
	string getName() const;
};

#endif
Last edited on
Yanson (885)
You need to define your default constructor.
gunman353 (23)
Issue seems to be having 
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public:
	Animals();

in Animals.h

After deleting that line of code the program works flawlessly. I don't really understand why that should have been there in the first place.
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