2023年12月2日发(作者：)

c语言无效参数视为严重错误,C语言编译错误：错误：‘-’参数类型无效（有‘int’）...一、编译错误代码：#include int main(){#define offsetof(type, member) ((size_t) &((type *)0->member))struct test{int a;int b;};printf("offset of a %dn", offsetof(struct test, a));printf("offset of b %dn", offsetof(struct test, b));return 0;}二、错误信息：test.c:5:57: 错误：‘->’参数类型无效(有‘int’)#define offsetof(type, member) ((size_t) &((type *)0->member))^test.c:13:32: 附注：in expansion of macro ‘offsetof’printf("offset of a %dn", offsetof(struct test, a));^~~~~~~~test.c:5:57: 错误：‘->’参数类型无效(有‘int’)#define offsetof(type, member) ((size_t) &((type *)0->member))^test.c:14:32: 附注：in expansion of macro ‘offsetof’printf("offset of b %dn", offsetof(struct test, b));^~~~~~~~三、错误原因运算符"->"的优先级高于强转的优先级，编译器先取0->member的值四、修改后代码#include int main(){#define offsetof(type, member) ((size_t) &(((type *)0)->member))struct test{int a;int b;};printf("offset of a %dn", offsetof(struct test, a));printf("offset of b %dn", offsetof(struct test, b));return 0;}