我用xdata 数据指针定义如下   struct course xdata * xdata course1;
struct course xdata * xdata course2;
struct course xdata * xdata course3;
struct course xdata * xdata course4;
volatile struct course xdata * xdata course[4];
现我把course[4]指向course1;2;3;4;   为什么总提示： pointer to different objects
 course[0] = &course1;
 course[1] = &course2;
 course[2] = &course3;
 course[3] = &course4; 此帖出自小平头技术问答