求下列几行程序的解释,//主程序 int main() {\x05FILE *fp;\x05int sel; \x05Node *p,*r;\x05Link l;\x05l=(Node *)malloc(sizeof(Node));//分配一个节点的内存 \x05l->next=NULL;\x05r=l;\x05fp=fopen("card.txt","ab+");//打开文件流card.
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