add undefined logic to all gates

src/AndGate.cpp

@@ -16,6 +16,9 @@ Event AndGate::evaluate(int evTime) {
 	else if(in1->getValue(evTime) == 1 && in2->getValue(evTime) == 1){
 		return Event(-1, 1, evTime + delay, out);
 	}
+	else{
+		return Event(-1, -1, evTime + delay, out);
+	}
 }
 
 int AndGate::getDelay()

src/NandGate.cpp

@@ -13,9 +13,12 @@ Event NandGate::evaluate(int evTime)
 	if (in1->getValue(evTime) == 0 || in2->getValue(evTime) == 0) {
 		return Event(-1, 1, evTime + delay, out);
 	}
-	else {
+	else if (in1->getValue(evTime) == 1 && in2->getValue(evTime) == 1) {
 		return Event(-1, 0, evTime + delay, out);
 	}
+	else{
+		return Event(-1, -1, evTime + delay, out);
+	}
 }
 
 int NandGate::getDelay()

src/NorGate.cpp

@@ -16,6 +16,9 @@ Event NorGate::evaluate(int evTime) {
 	else if (in1->getValue(evTime) == 0 && in2->getValue(evTime) == 0) {
 		return Event(-1, 1, evTime + delay, out);
 	}
+	else{
+		return Event(-1, -1, evTime + delay, out);
+	}
 }
 
 int NorGate::getDelay()

src/NotGate.cpp

@@ -9,11 +9,13 @@ NotGate::NotGate(int d, Wire* wire1, Wire* wire2) {
 }
 
 Event NotGate::evaluate(int evTime) {
-	if (in1->getValue(evTime) == 0) {
+	if (in1->getValue(evTime) == 1) {
 			return Event(-1, 0, evTime + delay, out);
+	}else if (in1->getValue(evTime) == 0) {
+			return Event(-1, 1, evTime + delay, out);
 	}
 	else {
-			return Event(-1, 1, evTime + delay, out);
+		return Event(-1, -1, evTime + delay, out);
 	}
 }
 

src/OrGate.cpp

@@ -16,6 +16,9 @@ Event OrGate::evaluate(int evTime) {
 	else if (in1->getValue(evTime) == 0 && in2->getValue(evTime) == 0) {
 		return Event(-1, 0, evTime + delay, out);
 	}
+	else{
+		return Event(-1, -1, evTime + delay, out);
+	}
 }
 
 int OrGate::getDelay()

src/XnorGate.cpp

@@ -18,6 +18,9 @@ Event XnorGate::evaluate(int evTime) {
 			return Event(-1, 0, evTime + delay, out);
 		}
 	}
+	else {
+		return Event(-1, -1, evTime + delay, out);
+	}
 }
 
 int XnorGate::getDelay()

src/XorGate.cpp

@@ -18,6 +18,9 @@ Event XorGate::evaluate(int evTime) {
 			return Event(-1, 0, evTime + delay, out);
 		}
 	}
+	else {
+		return Event(-1, -1, evTime + delay, out);
+	}
 }
 
 int XorGate::getDelay()