Lecture 24
5
Dispatch table vs if-else if-else if
•To add new commands just
add a table entry
•Command semantics separate
from syntax
•Lots of design overhead, hard to
understand
•Good for large command sets
that will grow (Juno
shell commands)
•To add new commands must
edit the main loop
•Command semantics and syntax
in same place
•Quick and dirty, easy to understand
and code
•Good for small command sets
that stay put (Juno
login loop)
Lecture 17