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    <p>Where to start? This has a lot of errors.</p> <ol> <li><p>Don't have "using namespace std;", it clutters the global namespace. Rather, use std::list, std::cin, etc. using the namespace to identify the specific object or class.</p></li> <li><p>In the exception class, don't write your own <code>what()</code> method. Just initialise the base class in the constructor.</p> <pre><code>class EPilaVacia : public std::exception { public: EPilaVacia() : std::exception("Error: Pila Vacía") { } }; </code></pre></li> <li><p>I assume that the class Pila is just a learning exercise. In real life you would use <code>std::stack</code>, not make your own.</p></li> <li><p>If you are implementing the stack with a list, you don't need a "max" parameter.</p></li> <li><p>Don't allocate the list dynamically, that is silly. Just use <code>std::list&lt;T*&gt; ila;</code></p></li> <li><p>You don't need "cont". Use <code>ila.size();</code></p></li> <li><p>Don't make the functions like apilar() virtual. The list is private, so subclasses cannot access it, thus the methods cannot be overriden. Also, you don't have a virtual destructor, so inheritance is probably a bad idea.</p></li> <li><p>void apilar(T t) is a disaster. You pass t by value, then store the address of the parameter, which then goes out of scope. The function is unnecessary, lose it.</p></li> <li><p>Don't put "throw (EPilaVacia)" in method declarations. No compiler implements it and it is deprecated in the new C++11 standard.</p></li> <li><p>In tope(), use ila.back(), not ila.pop_back().</p> <pre><code>T tope() const { if(ila.empty()) { throw EPilaVacia(); } else { return *ila.back(); } } </code></pre></li> <li><p>In desapilar(), don't use clear as it will empty out the stack. Use something like this</p> <pre><code>T&amp; desapilar() { if(ila.empty()) { throw EPilaVacia(); } else { T *pt = ila.back(); ila.pop_back(); return *pt; } } </code></pre></li> <li><p><strong>NEVER</strong> use <code>system("Pause");</code> Use <code>std::cin.get();</code></p></li> <li><p>The objects you allocate with <code>new</code> are never deleted. You have a memory leak.</p></li> </ol> <p>There are probably more, but that should get you started. Note: I've scrawled this down quickly. There are probably errors above, so check my code, don't just copy it.</p>
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