diff --git a/src/andGate.cpp b/src/andGate.cpp
index 8451172..f344b60 100644
--- a/src/andGate.cpp
+++ b/src/andGate.cpp
@@ -2,8 +2,8 @@
 
 using namespace std;
 
-andGate::andGate(wire* wire1 = nullptr, wire* wire2 = nullptr,
-		wire* wire3 = nullptr) : in1(wire1), in2(wire2), out(wire3) {}
+andGate::andGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,
+		wire* wire3) : e(eQueue), delay(d), in1(wire1), in2(wire2), out(wire3) {}
 
 int andGate::evaluate(int evTime) {
 	int val1 = in1->getValue();
diff --git a/src/andGate.h b/src/andGate.h
index 384360d..009bc11 100644
--- a/src/andGate.h
+++ b/src/andGate.h
@@ -3,8 +3,8 @@
 
 class andGate : public gate {
 	public:
-		andGate(wire* wire1 = nullptr, wire* wire2 = nullptr,
-			wire* wire3 = nullptr);
+		andGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,
+			wire* wire3);
 		int evaluate(int evTime);
 };
 
diff --git a/src/gate.h b/src/gate.h
index acb0281..1c40065 100644
--- a/src/gate.h
+++ b/src/gate.h
@@ -5,10 +5,11 @@ class wire;
 class gate {
 	public:
 		gate();
-		virtual int evaluate() = 0;
+		virtual void evaluate() = 0;
 
 	protected:
 		wire *in1, *in2, *out;
+		priority_queue<event> *e;
 		int delay;
 };
 
diff --git a/src/norGate.cpp b/src/norGate.cpp
index e69de29..2b89207 100644
--- a/src/norGate.cpp
+++ b/src/norGate.cpp
@@ -0,0 +1,10 @@
+#include "norGate.h"
+
+using namespace std;
+
+norGate::norGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,
+		wire* wire3) : e(eQueue), delay(d), in1(wire1), in2(wire2), out(wire3);
+
+void norGate::evaluate(int evTime) {
+	//TODO
+}
diff --git a/src/norGate.h b/src/norGate.h
index 178e872..8b17022 100644
--- a/src/norGate.h
+++ b/src/norGate.h
@@ -1,9 +1,10 @@
-#ifndef OR
-#define OR
+#ifndef NOR
+#define NOR
 
-class orGate : public gate {
-	orGate(wire* wire1 = nullptr, wire* wire2 = nullptr, wire* wire3 = nullptr);
-	int evaluate();
+class norGate : public gate {
+	norGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,
+			wire* wire3);
+	void evaluate(int evTime);
 };
 
-#endif // !OR
+#endif // !NOR
diff --git a/src/notGate.cpp b/src/notGate.cpp
index 7215e46..b7225d2 100644
--- a/src/notGate.cpp
+++ b/src/notGate.cpp
@@ -2,13 +2,12 @@
 
 using namespace std;
 
-notGate::notGate(int gateDelay, wire* wire1 = nullptr, wire* wire2 = nullptr)
-	: delay(gateDelay), in1(wire1), out(wire2) {}
+notGate::notGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2)
+	: e(eQueue), delay(gateDelay), in1(wire1), out(wire2) {}
 
-notGate::evaluate() {
+void notGate::evaluate(int evTime) {
 	int val = in1->getValue();
 
 	if(val != -1) {
-		return !val;
 	}
 }
diff --git a/src/notGate.h b/src/notGate.h
index af06f5a..3ebd4c9 100644
--- a/src/notGate.h
+++ b/src/notGate.h
@@ -2,8 +2,8 @@
 #define NOT
 
 class not : public gate {
-	notGate(int delay, wire* wire1 = nullptr, wire* wire2 = nullptr);
-	int evaluate();
+	notGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2);
+	void evaluate(int evTime);
 };
 
 #endif // !NOT
diff --git a/src/orGate.cpp b/src/orGate.cpp
index e69de29..c682da9 100644
--- a/src/orGate.cpp
+++ b/src/orGate.cpp
@@ -0,0 +1,10 @@
+#include "orGate.h"
+
+using namespace std;
+
+orGate::orGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,
+		wire* wire3) : e(eQueue), delay(d), in1(wire1), in2(wire2), out(wire3);
+
+void orGate::evaluate(int evTime) {
+	//TODO
+}
diff --git a/src/orGate.h b/src/orGate.h
index 178e872..b552410 100644
--- a/src/orGate.h
+++ b/src/orGate.h
@@ -2,8 +2,9 @@
 #define OR
 
 class orGate : public gate {
-	orGate(wire* wire1 = nullptr, wire* wire2 = nullptr, wire* wire3 = nullptr);
-	int evaluate();
+	orGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,
+			wire* wire3);
+	void evaluate(int evTime);
 };
 
 #endif // !OR
diff --git a/src/xnorGate.cpp b/src/xnorGate.cpp
index e69de29..0a590c8 100644
--- a/src/xnorGate.cpp
+++ b/src/xnorGate.cpp
@@ -0,0 +1,11 @@
+#include "xnorGate.h"
+
+using namespace std;
+
+xnorGate::xnorGate(priority_queue<event> *eQueue, int d, wire* wire1,
+		wire* wire2, wire* wire3) : e(eQueue), delay(d), in1(wire1), in2(wire2),
+		out(wire3);
+
+void xnorGate::evaluate(int evTime) {
+	//TODO
+}
diff --git a/src/xnorGate.h b/src/xnorGate.h
index 178e872..ec0e344 100644
--- a/src/xnorGate.h
+++ b/src/xnorGate.h
@@ -1,9 +1,10 @@
-#ifndef OR
-#define OR
+#ifndef XNOR
+#define XNOR
 
-class orGate : public gate {
-	orGate(wire* wire1 = nullptr, wire* wire2 = nullptr, wire* wire3 = nullptr);
-	int evaluate();
+class xnorGate : public gate {
+	xnorGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,
+			wire* wire3);
+	void evaluate(int evTime);
 };
 
-#endif // !OR
+#endif // !XNOR
diff --git a/src/xorGate.cpp b/src/xorGate.cpp
index e69de29..0243f7e 100644
--- a/src/xorGate.cpp
+++ b/src/xorGate.cpp
@@ -0,0 +1,11 @@
+#include "xorGate.h"
+
+using namespace std;
+
+xorGate::xorGate(priority_queue<event> *eQueue, int d, wire* wire1,
+		wire* wire2, wire* wire3) : e(eQueue), delay(d), in1(wire1), in2(wire2),
+		out(wire3);
+
+void xorGate::evaluate(int evTime) {
+	//TODO
+}
diff --git a/src/xorGate.h b/src/xorGate.h
index 178e872..2bb0c6f 100644
--- a/src/xorGate.h
+++ b/src/xorGate.h
@@ -1,9 +1,10 @@
-#ifndef OR
-#define OR
+#ifndef XOR
+#define XOR
 
-class orGate : public gate {
-	orGate(wire* wire1 = nullptr, wire* wire2 = nullptr, wire* wire3 = nullptr);
-	int evaluate();
+class xorGate : public gate {
+	xorGate(priority_queue<event> *eQueue, int d, wire* wire1, wire* wire2,
+			wire* wire3);
+	void evaluate(int evTime);
 };
 
-#endif // !OR
+#endif // !XOR