FchiTlchildNULLTrchildNULLPush_TSTelseT
ewTNodeTdataFchiTlchildPop_TSTrchildPop_TSPush_TST
i
tCalci
tacharopri
tb
switchopr
caseretur
abcaseretur
abcaseretur
abcaseretur
ab
i
tValueTNodeT
ifTlchildNULLTrchildNULL
由中缀表达式生成表达式二用以存放生成的二叉树结
求得S的前缀表达式
计算求表达式二叉树的值
fretur
Tdataelse
retur
CalcValueTlchildTdataValueTrchild
JudgeExphi
cludeiostreami
clude