C++ Inheritance error - c++

Question

Here's the code that triggers the error (Player.cpp):
#include "Library.h"
Player::Player(){
//generate player stats
str = rand()%6+1+1;
inte = rand()%6+1;
c = (rand()%6+1)+floor(str/3);
wis = rand()%6+1+floor(inte/4);
ref = rand()%6+1+floor(wis/4);
i = floor(ref/3);
hp = floor((str+(wis/3)+(ref/2)));
xp = 0;
}
//printStats (constant Player player reference)
//prints player's stats
void Player::printStats() const{
cout << "\nSTR: " << str << endl;
cout << "INTE: " << inte << endl;
cout << "C: " << c << endl;
cout << "WIS: " << wis << endl;
cout << "REF: " << ref << endl;
cout << "I: " << i << endl;
cout << "HP: " << hp << endl;
cout << "XP: " << xp << endl;
cout << "Gold: " << gold << endl;
cout << "Level: " << lvl << endl << endl;
}
int Player::giveOptions(int amount,string op1, string op2, string op3, string op4, string op5){
cout << "Type the number then press the enter key to choose or type 'help' for extra commands." << endl;
for(int i=1;i<=amount;i++){
string s;
switch(i){
case 1:
s = op1;
break;
case 2:
s = op2;
break;
case 3:
s = op3;
break;
case 4:
s = op4;
break;
case 5:
s = op5;
break;
}
cout << i << ". " << s << endl;
}
while(true){
string s;
cin >> s;
if (s == "1")
return 1;
else if (s == "2")
return 2;
else if (s == "3")
return 3;
else if (s == "4")
return 4;
else if (s == "5")
return 5;
else{
if (s == "stats")
printStats();
else if (s == "help"){
cout << "Type the number that is next to the option you wish to choose then press the enter key, or 'stats' to print all of your stats." << endl;
cout << "E.G:\n1. Town\nI want to go to the town\n1" << endl;
}
else
cout << "Command not recognised. If you're confused, type 'help'." << endl;
}
}
}
(Original question below)
I'm fairly basic in C++, and I'm not sure why this is producing an error. In Player.cpp, all members of Entity that I thought were inherited produce the error, "x is not a member of Player". My only thought is that I'm using inheritance wrong.
Entity.h:
#include "Library.h"
using namespace std;
class Entity {
public:
void printStats() const;
protected:
//player stats
std::string name;
double str; //strength
double wis; //wisdom
double ref; //reflex
double hp; //health points
double i; //initiative
double inte; //intelligence
double c; //courage
int gold; //gold
int xp; //experience
int ap; //armour points
int wd; //weapon damage
int lvl; //level
int sp; //skill points
};
Player.h
#include "Library.h"
using namespace std;
class Player: public Entity{
public:
Player();
int giveOptions(int amount, string op1, string op2, string op3, string op4, string op5);
};

Answer 1

void Player::printStats() const
Should be, according to your headers:
void Entity::printStats() const
On the includes, do one of these, whichever suits your code best:
1.
Player.h must include Entity.h
Library.h should not include Player.h or Entity.h
Player.h and/or Entity.h can include Library.h if really needed.
or 2.
Player.h must include Entity.h, but not Library.h
Entity.h must not include Library.h
Library.h can include Player.h and/or Entity.h
This avoids the cyclic dependencies you currently have - which leads to Player being defined before Entity and giving the base class undefined error.

Answer 2

As the compiler compliains - neither the class Entity nor the Player has a member variable called x. You need to include "Entity.h" in the Player header file, since in the current translation unit compiler doesn't know what Player is.