Add the includes and fixed the xnor class definition

src/andGate.h

@@ -1,5 +1,8 @@
 #ifndef AND
 #define AND
+#include "gate.h"
+#include "event.h"
+#include "wire.h"
 
 class andGate : public gate {
 	public:

src/norGate.h

@@ -1,5 +1,8 @@
 #ifndef NOR
 #define NOR
+#include "gate.h"
+#include "event.h"
+#include "wire.h"
 
 class norGate : public gate {
 	norGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,

src/orGate.h

@@ -1,7 +1,10 @@
 #ifndef OR
 #define OR
+#include "gate.h"
+#include "event.h"
+#include "wire.h"
 
-class xnorGate : public gate {
+class orGate : public gate {
 	orGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,
 			wire* wire3);
 	void evaluate(int evTime);

src/xnorGate.h

@@ -1,5 +1,8 @@
 #ifndef XNOR
 #define XNOR
+#include "gate.h"
+#include "event.h"
+#include "wire.h"
 
 class xnorGate : public gate {
 	xnorGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,

src/xorGate.h

@@ -1,5 +1,8 @@
 #ifndef XOR
 #define XOR
+#include "gate.h"
+#include "event.h"
+#include "wire.h"
 
 class xorGate : public gate {
 	xorGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,