刚接触c请问a函数里的for后面括号的代码是什么意思

Question

typedef struct ufd
{
fileTable *file;
ufd *next;
}UFD;

typedef struct mfd

{
char userName[10];
char password[10];
UFD *user;
}MFD;
MFD userTable[MaxUser];
a（）{
UFD *p, *q;
q = userTable[userID].user;
for (p = q->next; p != NULL; p = p->next)
}

Answer 1

找到usertable中下一个不为空的节点…