按先序打印二叉树叶子结点

/*按先序打印二叉树叶子结点*/
#include<stdio.h>
typedef struct btnode
{
    char data;
    struct btnode *lchild,*rchild;      /*指向左右孩子的指针*/
}BinTree;
/*二叉树的创建*/
BinTree * CreateTree(BinTree *T)
{
    char ch;
    scanf("%c",&ch);
    if(ch=='#')
        return 0;
    else
    {
        T=(BinTree *)malloc(sizeof(BinTree));
        T->data=ch;
        T->lchild=CreateTree(T->lchild);    /*创建左子树*/
        T->rchild=CreateTree(T->rchild);    /*创建右子树*/
        return(T);
    }
}
/*先序遍历根指针为T的二叉树*/
void Preorder(BinTree *T)
{
    if(T)
    {
        printf("%c ",T->data);  /*访问根节点T*/
        Preorder(T->lchild);    /*先序遍历左子树*/
        Preorder(T->rchild);    /*先序遍历右子树*/
    }
}
/*打印叶子结点*/
int leafnode(BinTree *T)
{
    if(T!=NULL)
        {
            if((T->lchild==NULL) && (T->rchild==NULL))
            printf("%c ",T->data);
            leafnode(T->lchild);
            leafnode(T->rchild);
        }

}
main()
{
    BinTree *b;
    printf("请按先序的方式输入二叉树的结点元素:\n");
    b=CreateTree(b);
    printf("前序输出:\n");
    Preorder(b);
    printf("\n");
    printf("按先序顺序打印叶子结点值:");
    leafnode(b);
}