堆栈有哪两种基本操作?它们的含义是什么?
压栈(Push)操作:其含义是将数据存人堆栈的栈顶单元。(2 分)弹出(POP)操作:其含义是将一个数据从堆栈栈顶单元取出,并释放该存储单元,该数据逻辑上已不在堆栈中了。(3 分)注:若只答了有压栈和弹出两种操作,则给2分。
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