3 Binary adding revisited

We have already visited binary adding in module 0144. However, that module does not go into a lot of details of the actual mechanism used to add two binary numbers.

 3.1 Revisiting the add rules
 3.2 Bit operators
 3.3 Back to adding
 3.4 Half adding and full adding
 3.5 The last carry
 3.6 Is the result zero?