求助算法编译问题

Question

gcc4.2.4  Ubuntu 下的编译器
下列代码……报错

#include "stdlib.h"
#include "stdio.h"
#define ERROR 0
#define OVERFLOW -2
#define OK 1
typedef int Status;
typedef char ElemType ;
typedef struct BiTree{
        ElemType  data;
        struct BiTree *lchild, *rchild;
} *BiTree,BIT;

Status CreateBiTree(BiTree T)
{ char ch;
   scanf("%c",&ch);
   if(ch=='*') T=NULL;
   else {
                        if(!(T=(BiTree)malloc(sizeof(BIT))))  exit(OVERFLOW);
                        T->data=ch;
                        CreateBiTree(T->lchild);
                        CreateBiTree(T->rchild);
                        };
                        return OK;
                        };
int Visit (ElemType e)
{       
        printf("%c",e);
        return OK;
};
Status PreOrderTraverse ( T){

if(T){
        if(Visit(T->data))
                if(PreOrderTraverse(T->lchild))
                        if(PreOrderTraverse(T->rchild)) return OK;
                        return ERROR;
} else  return OK;
};

Status InOrderTraverse ( T){

if(T){
        if(InOrderTraverse(T->lchild))
                if(Visit(T->data))       
                        if(InOrderTraverse(T->rchild)) return OK;
                        return ERROR;
} else  return OK;
};
Status PostderTraverse (T){

if(T){
                if(PostOrderTraverse(T->lchild))
                        if(Visit(T->data))
                                if(PostOrderTraverse(T->rchild)) return OK;
                        return ERROR;
} else  return OK;
};

main()
{
  CreateBiTree ();
  PreOrderTraverse ();
        InOrderTraverse();
        PostderTraverse();
}

错误代码
20091176@calcium:~/project$ gcc -o tree tree.c
In file included from /usr/include/stdio.h:34,
                 from tree.c:2:
tree.c:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before string constant
In file included from /usr/include/stdio.h:75,
                 from tree.c:2:
/usr/include/libio.h:332: error: expected specifier-qualifier-list before ‘size_t’
/usr/include/libio.h:364: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/libio.h:373: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/libio.h:493: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘_IO_sgetn’
In file included from tree.c:2:
/usr/include/stdio.h:312: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:319: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:361: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:363: error: format string argument not a string type
/usr/include/stdio.h:365: error: expected declaration specifiers or ‘...’ before ‘size_t’
/usr/include/stdio.h:367: error: format string argument not a string type
/usr/include/stdio.h:678: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fread’
/usr/include/stdio.h:684: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fwrite’
/usr/include/stdio.h:706: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fread_unlocked’
/usr/include/stdio.h:708: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fwrite_unlocked’
tree.c: In function ‘CreateBiTree’:
tree.c:19: warning: incompatible implicit declaration of built-in function ‘malloc’
tree.c:19: warning: incompatible implicit declaration of built-in function ‘exit’
tree.c: In function ‘PreOrderTraverse’:
tree.c:34: error: invalid type argument of ‘->’
tree.c:35: error: invalid type argument of ‘->’
tree.c:36: error: invalid type argument of ‘->’
tree.c: In function ‘InOrderTraverse’:
tree.c:44: error: invalid type argument of ‘->’
tree.c:45: error: invalid type argument of ‘->’
tree.c:46: error: invalid type argument of ‘->’
tree.c: In function ‘PostderTraverse’:
tree.c:53: error: invalid type argument of ‘->’
tree.c:54: error: invalid type argument of ‘->’
tree.c:55: error: invalid type argument of ‘->’
tree.c: In function ‘main’:
tree.c:62: error: too few arguments to function ‘CreateBiTree’

求指教

Answer 1

写的真乱。

Status PreOrderTraverse ( T){

这儿的T是神马？

Answer 2

函数结束的｝后为嘛加个；？

Answer 3

不光语法上有问题，逻辑上也混乱：CreateBiTree，这个函数你没有返回一个节点，无论是通过返回值还是通过参数输出。
懒得看了。