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Status PreOrderTraverse(BiTree T,Status(*Visit)(TElemType e)){
//ǰÐò±éÀú¶þ²æÊ÷µÄ·ÇµÝ¹éËã·¨£¬¶Ôÿ¸öÔªËØµ÷Óú¯ÊýVisit
InitStack(S); p = T;
while(p || !StackEmpty(S)){
if(p){
if(!Visit(p->data)){
return ERROR;
}
Push(S,p);
p = p->lchild;
}
else{
Pop(S,p);
p = p->rchild;
}
}//while
return OK;
} //PreOrderTr
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