导读 你只初始了und[0] struct undergraduate{ int num; char name[20]; int id; int borrownum; i...
你只初始了und[0] struct undergraduate{ int num; char name[20]; int id; int borrownum; int borrowtime;} und[20]= {{0,"",1,10,30}, {1,"",2,10,30}, {2,"",3,10,30}, {3,"",4,10,30},... ...};。