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    <p>Let's go through line-by-line:</p> <pre><code>#ifndef PLAYER_H #define PLAYER_H #include "utility.h" </code></pre> <p>So far so good, you might check if your compiler supports <code>#pragma once</code>, but the macro will work perfectly fine.</p> <pre><code>class Player() </code></pre> <p><code>()</code> aren't allowed in a class name, take them off</p> <pre><code>{ public: //getPlayerID(); }; #endif </code></pre> <p>The rest of the header file is ok. Let's look at the implementation file:</p> <pre><code>#include "player.h" </code></pre> <p>Perfect. Putting a class in a header is the best way to make sure you only have one definition used in your whole program.</p> <pre><code>class Player() </code></pre> <p>Parentheses aren't allowed, but here you have a bigger problem. You already have a class with that name. Let the header provide the class definition, the implementation file just needs to provide the non-inline member functions (and any helper code).</p> <pre><code>{ string playerID; int timeCycle; } </code></pre> <p>Here's a complete corrected version:</p> <pre><code>#if !defined(PLAYER_H) #define PLAYER_H #include &lt;string&gt; #include "utility.h" class Player { std::string player_id; int time_cycle; public: // this is how you make a constructor, the parenthesis belong here, not on the class name Player(std::string id, int time); std::string getPlayerId() const; }; #endif /* !defined(PLAYER_H) */ </code></pre> <p>and implementation file</p> <pre><code>#include "player.h" // and this is how you write a non-inline constructor Player::Player(std::string id, int time) : player_id(id) , time_cycle(time) {} std::string Player::getPlayerId() const { return player_id; } </code></pre> <p>All of these problems are really basic C++ stuff, nothing to do with NachOS.</p>
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    1. POHow to make classes in NACHOS (C++)
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    1. COThis works great and it compiles now. But now let's say I wanted to initialize a player with both a playerID and timeCycle. I originally put player() because I wanted to change it to player(string playerID, int timeCycle) . From what I know, getters and setters are done differently in c++
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    2. CO@krikara: The constructor declaration goes INSIDE the class. I'll edit with an example.
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    3. CO#include <string.h> should be #include <string> . Otherwise you include the C file.
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