二叉树问题非递归中序遍历

Question

typedef struct bnode
{char data;
struct bnode *lchild;
struct bnode *rchild;
int top;
}bnode;
 bnode stack[100];
void initstack(bnode * stack)
{
    stack->top=-1;}
void push(bnode*stack,bnode*p)
{ if(p)
 {stack->top++;
 stack[stack->top].data=p->data;
}}
void pop(bnode*stack)
{
    stack->top--;}
int stackempty(bnode*stack)
{ if (stack->top==-1)
    return 0;
return 1;
}
bnode * top(bnode*stack)
{ bnode* t=&stack[stack->top];

return t;}
void stackmidread(bnode*root)
{ bnode*p=root;

initstack(stack);
while(p || stackempty(stack)==1)
{    while(p)
{push(stack,p);
 p=p->lchild;
}
if (stackempty(stack)==1)
{ p=top(stack);
  printf("%c", p->data);
  pop(stack);
  p=p->rchild;
}}

跪求大佬解答 为什么中序遍历ABD###CE##FG###
只显示DBA
bnode * createtree()
{ char ch;
bnode*p;

  ch=getchar();
  if (ch=='#')
      p=NULL;
  else{ p=(bnode*)malloc(sizeof(bnode));
  p->data=ch;
  p->lchild=createtree();
  p->rchild=createtree();}
  return p;
}
```void main ()
{ bnode *root=createtree();

stackmidread(root);
}