expAst: obj
Top:
print:<
isEmpty:<
out B: var Boolean
eval:<
out V: var integer
Node:left:right: Top
print::
expNode:left:right: Node:left:right
eval::
termNode:left:right: Node:left:right
eval::
numberNode:left:right: Node:left:right
eval::
digitNode:left:right: Node:left:right
eval::
empty: top
isEmpty::
eval::
ind: var integer