我需要帮助在C ++ LNK2005和LNK1169中分离类代码

Question

I'm new at C++ and I have to create a simple video game, that has an enemy class, the problem comes when I try to separate the enemy code from the main.cpp, creating enemy.h and enemy.cpp, I followed all instructions I saw on the internet but it keeps showing me the error message I hope you guys can help me.

enemy.cpp file

#include "enemy.h"

enemy::enemy(int _hp, int _attackValue, string _name) {
    hp = _hp;
    attackValue = _attackValue;
    name = _name;
}

void enemy::attack(enemy agressor, enemy objective) {
    objective.set_hp(objective.hp - agressor.attackValue);
    objective.showinfo(objective, 2);
}

void enemy::showinfo(enemy enemy, int hero) {
    if (hero == 1) {
        cout << "     \n\n\n\n\n\n\n";
        cout << enemy.name;
        cout << "     \n\n\n\n\n\n\n\n";
        for (int i = enemy.hp / 5; i > 0; i--) {
            cout << "|";
        }
        cout << "     \n\n\n\n\n\n\n\n\n";
        cout << enemy.hp;
    }
    else {
        cout << "                                   \n\n\n\n\n\n\n";
        cout << enemy.name;
        cout << "                                   \n\n\n\n\n\n\n\n";
        for (int i = enemy.hp / 5; i > 0; i--) {
            cout << "|";
        }
        cout << "                                   \n\n\n\n\n\n\n\n\n";
        cout << enemy.hp;
    }
}

int enemy::get_hp() {
    return hp;
}

void enemy::set_hp(int _hp) {
    hp = _hp;
}

int enemy::get_attackValue() {
    return attackValue;
}

string enemy::get_name() {
    return name;
}

enemy.h file

#pragma once

#ifndef enemy_H
#define enemy_H

class enemy {

private:

    int hp, attackValue;
    string name;
public:
    enemy();
    enemy(int, int, string);
    void attack(enemy, enemy);
    void showinfo(enemy, int);
    int get_hp();
    void set_hp(int hp);
    int get_attackValue();
    string get_name();
};

#endif // !enemy_H

PD: I still don't know how to implement setcursorposition in c++ as you can see.

Answer 1

You have declared enemy() but haven't defined it. If you declare the default constructor, make sure you define it (possibly in your .cpp file)

Answer 2

That error that you get means that you violated ODR (one definition rule) . In other words, when you tried to separate your enemy class from your main you didn't remote all the parts from there and ended up with the same code in multiple cpp files.

As a side note, looks like you forgot to define your enemy::enemy() constructor, or forgot to move it from main.cpp to enemy.cpp?