预计'结构matrix_t *“，但参数的类型为”结构matrix_t *“？_？没有不同 [英] expected ‘struct matrix_t *’ but argument is of type ‘struct matrix_t *’ ?_? no difference

问题描述

main.c:78:25: erreur: assignment from incompatible pointer type [-Werror]
main.c:81:9: erreur: passing argument 2 of ‘matrix_multiply’ from incompatible pointer type [-Werror]
main.c:6:11: note: expected ‘struct matrix_t *’ but argument is of type ‘struct matrix_t *’

6号线是matrix_multiply功能

line 6 is the matrix_multiply function

这是我的code这开始于第74行

here is my code which begin at line 74

matrix_t *m;
matrix_t *first = matrix_reader_next(reader);
matrix_t *previous = first;
while ( (m = matrix_reader_next(reader))) {
    previous->next = m;
    previous = m;
}
matrix_t *result = matrix_multiply(first,first->next);

和这里是我的函数原型和结构

and here are my function prototypes and structure

typedef struct {
   int **M;
   int nLi;
   int nCo;
   struct matrix_t *next;
} matrix_t;

matrix_t* matrix_multiply(matrix_t* first, matrix_t*second);
matrix_t* matrix_reader_next(matrix_reader_t *r);

我真不明白这些错误消息。请帮我：）

I really don't understand these error message. Please help me :)

推荐答案

您的类型定义应该阅读

typedef struct matrix_t {
   int **M;
   int nLi;
   int nCo;
   struct matrix_t *next;
} matrix_t;

否则，键入 matrix_t 指的是完整的，但不愿透露姓名的结构类型，而结构matrix_t 指的是不同的命名但不完整的结构类型，你永远无法定义。

Otherwise, the type matrix_t refers to a complete but unnamed structure type, whereas struct matrix_t refers to a different, named but incomplete structure type which you never define.

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