Added __str__ / __repr__ methods

register.py

@@ -40,6 +40,12 @@ class Register:
         self.complement()
         self.value += 1
 
+    def __str__(self):
+        return "{:08b}".format(self.value)
+
+    def __repr__(self):
+        return "{} ({})".format(self, self.n_bits)
+
 
 class Acumulator(Register):
     positive_flag = False