Warum wird sein syntaktisch korrektes Programm nicht auf der Xcode IDE mit dem llvm Compiler kompiliert?

Question

Github-Repository: https://github.com/d-parkinson/C-practice-file.git

Created 4/04/2016 by Darren Parkinson. This is a two player simulation fight game between two characters: a Villian and a Hero Each Character has four features respectively: Name(string), health(integer), kick(integer), punch(integer)

#include <iostream> 
#include <string> 

Superclass holding details of regarding the features of the characters

class Character{ 
public: 
    std::string name; 
    static int health; 
    int kick; 
    int punch; 
    Character(std::string name, int health, int kick, int punch){ 
     this -> health = health; 
     this -> name = name; 
     this -> kick = kick; 
     this -> punch = punch; 
    } 
    ~Character(){} 
}; 

Subclass displaying features of heroes

class Hero : public Character{ 
public: 
    Hero(std::string name, int health, int kick, int punch) : Character(name, health, kick, punch){ 
     std::cout << name << ": Joker giving trouble again" << std::endl; 
    } 
    ~Hero(){} 
}; 

Subclass displaying features of villians

class Villian : public Character{ 
public: 
    Villian(std::string name, int health, int kick, int punch) : Character(name, health, kick, punch){ 
     std::cout << name << ": Hey there hehehe" << std::endl; 
    } 
    ~Villian(){} 
}; 

Functions illustrating actions between both villain and hero classes

void VillianPunch(Hero *hero, Villian *villian){ 
    hero -> health -= villian -> punch; 
    std::cout << villian -> name << ": take this(punch)" << std::endl; 
} 
void VillianKick(Hero *hero, Villian *villian){ 
    hero -> health -= villian -> kick; 
    std::cout << villian -> name << ": take this(kick)" << std::endl; 
} 
void HeroPunch(Hero *hero, Villian *villian){ 
    villian -> health -= hero -> punch; 
    std::cout << hero -> name << ": take this(punch)" << std::endl; 
} 
void HeroKick(Hero *hero, Villian *villian){ 
    villian -> health -= hero -> kick; 
    std::cout << hero -> name << ": take this(kick)" << std::endl; 
} 

The main functions

int main(void){ 
    Hero *batman; 
    Villian *joker; 
    joker = new Villian("Joker",1000,90,63); 
    batman = new Hero("Batman",1100,93,60); 
    std::cout << "Fight!!!" << std::endl; 

Do function simulating the fight between Villian and Hero

do{ 
     HeroPunch(batman, joker); 
     VillianPunch(batman, joker); 
     VillianKick(batman, joker); 
     HeroKick(batman, joker); 
     if(batman -> health <= 0) 
      std::cout << joker -> name << ": You won't catch me today hehehe" << std::endl; 
     else if(joker -> health <= 0) 
      std::cout << batman -> name << ": How many times do I have to defeat you" << std::endl; 
    }while((batman -> health > 0) & (joker -> health > 0)); 
    delete joker; 
    delete batman; 
    return 0; 
} 

I'm a new c++ programmer, practicing with git and stack overflow
Error messages below:

"Character::health",referenced from:

VillianPunch(Hero*, Villian*) in Game-simulation.o

VillianKick(Hero*, Villian*) in Game-simulation.o

HeroPunch(Hero*, Villian*) in Game-simulation.o

HeroKick(Hero*, Villian*) in Game-simulation.o

_main in Game-simulation.o

Character::Character(std::__1::basic_string, std::__1::allocator >, int, int, int) in Game-simulation.o ld:

symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

Der Code Kompilierung tat; Die Fehlermeldung stammt vom Linker. (Warum der Linker das Symbol, über das er sich beschwert hat, nicht finden konnte, liegt vermutlich irgendwo in der Interaktion zwischen dem Code, der Simulationsbibliothek und der Standardbibliothek und ich spekuliere nicht.)