C、 "conflicting types for... "错误

Question

在我继续之前，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;

编译时出现以下错误:

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 block 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。所以在头文件中使用宏来避免多重包含。

#ifndef TEST_H__
#define TEST_H__

/*you header file can have declarations here*/

#endif /* TEST_H__*/

我假设，您的头文件中没有这种方法。