• 2022-06-19
    链栈S的栈顶指针为top,不能执行出栈操作的是()
    A: p=S->top;S->top=p->next;
    B: p=S->top;S->top=p;
    C: p=S;S->top=p->next;
    D: p=S->top;S->top=p->next->next;