C,"......的冲突类型"错误

Question

在继续之前,这是给我一个错误的代码:

#define numScores 3             // the number of test scores which a student will have

struct btreenode{
int studentID;              // the ID number of the student at the current node

float scores[3];            // the 3 test scores of the student

float average;              // the average of the 3 test scores for the student

struct btreenode *left;     // pointer to left side of the tree
struct btreenode *right;    // pointer to right side of the tree
};

typedef struct btreenode *Node;

编译时我收到以下错误:

btreenode.h:17: error: redefinition of 'struct btreenode'
btreenode.h:28: error: conflicting types for 'Node'
btreenode.h:28: note: previous declaration of 'Node' was here

我在顶部有一个块注释,因此行号已关闭,但是

第17行是第一行" struct btreenode{"

第28行是最后一行" typedef struct btreenode *Node"

有谁知道我为什么会收到这些错误？

Answer 1

头文件不应包含多次.因此,在头文件中使用宏来避免多次包含.

#ifndef TEST_H__
#define TEST_H__

/*you header file can have declarations here*/

#endif /* TEST_H__*/

我认为,这种方法不在你的头文件中.