以下程序段的输出结果是（队列中的元素类型QElem Type为char)：void main( ){Queue Q; Init Queue (Q);Char x=’e’; y=’c’;EnQueue (Q,’h’); EnQueue (Q,’r’); EnQueue (Q, y);DeQueue (Q,x); EnQueue (Q,x);DeQueue (Q,x); EnQueue (Q,’a’);while(!QueueEmpty(Q)){ DeQueue (Q,y);printf(y);};Printf(x);}

A. stack
B. char
C. sackt
D. shtck