📄 ds3.1.2.htm
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<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>{
</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> if
( Empty_SeqStack ( s ) ) </b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
return ERROR; /*<font FACE="??ì?,SimSun" LANG="ZH-CN">栈空</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>else
</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
return (s->data[s->top] );</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font FACE="??ì?,SimSun" LANG="ZH-CN" size="5" color="#FFFFFF"><b>以下几点说明：</b></font></p>
</blockquote>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>1. <font FACE="??ì?,SimSun" LANG="ZH-CN">对于顺序栈，入栈时，首先判栈是否满了，栈满的条件为：</font>s->top=
=MAXSIZE-1<font FACE="??ì?,SimSun" LANG="ZH-CN">，栈满时，不能入栈</font>;
<font FACE="??ì?,SimSun" LANG="ZH-CN">否则出现空间溢出，引起错误，这种现象称为上溢。</font></b></font></p>
<p><font size="5" color="#FFFFFF"><b>2. <font FACE="??ì?,SimSun" LANG="ZH-CN">出栈和读栈顶元素操作，先判栈是否为空，为空时不能操作，否则产生错误。通常栈空时常作为一种控制转移的条件。</font></b></font></p>
<b><font FACE="oúì?,SimHei" LANG="ZH-CN">
<p ALIGN="JUSTIFY"><font size="5" color="#FFFF00">2. 链栈</font></p>
</font></b>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">
用链式存储结构实现的栈称为链栈。通常链栈用单链表表示，因此其结点结构与单链表的结构相同，在此用</font>LinkStack<font FACE="??ì?,SimSun" LANG="ZH-CN">表示，即有：</font></b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>typedef
struct node</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>{
</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
datatype data;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
struct node *next;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>}StackNode<font FACE="??ì?,SimSun" LANG="ZH-CN">，</font>*
LinkStack;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">说明</font>top<font FACE="??ì?,SimSun" LANG="ZH-CN">为栈顶指针：</font>
LinkStack top ;</b></font></p>
<p ALIGN="JUSTIFY"> <font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">因为栈中的主要运算是在栈顶插入、删除，显然在链表的头部做栈顶是最方便的，而且没有必要象单链表那样为了运算方便附加一个头结点。通常将链栈表示成图</font>3.3<font FACE="??ì?,SimSun" LANG="ZH-CN">的形式。链栈基本操作的实现如下：</font></b></font><font SIZE="3"><img border="0" src="ds3.1.3.gif" align="right" width="137" height="209"></p>
</font>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">⑴</font>
<font FACE="??ì?,SimSun" LANG="ZH-CN">置空栈</font></b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>LinkStack
Init_LStack<font FACE="??ì?,SimSun" LANG="ZH-CN">（</font>LinkStack top<font FACE="??ì?,SimSun" LANG="ZH-CN">）</font></b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>{
</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
top=NULL
</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> return
OK;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">⑵</font>
<font FACE="??ì?,SimSun" LANG="ZH-CN">判栈空</font></b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>int
Empty_LinkStack<font FACE="??ì?,SimSun" LANG="ZH-CN">（</font>LinkStack top <font FACE="??ì?,SimSun" LANG="ZH-CN">）</font></b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>{</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
if<font FACE="??ì?,SimSun" LANG="ZH-CN">（</font>top==NULL<font FACE="??ì?,SimSun" LANG="ZH-CN">）</font>
</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
return OK;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"> <font size="5" color="#FFFFFF"><b>else
</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
return ERROR;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<blockquote>
</blockquote>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">⑶</font>
<font FACE="??ì?,SimSun" LANG="ZH-CN">进栈</font></b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>LinkStack
Push_LStack<font FACE="??ì?,SimSun" LANG="ZH-CN">（</font>LinkStack top,
datatype x<font FACE="??ì?,SimSun" LANG="ZH-CN">）</font></b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>{
</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> </b></font><font size="5" color="#FFFFFF"><b>
StackNode *s;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
s=malloc<font FACE="??ì?,SimSun" LANG="ZH-CN">（</font>sizeof<font FACE="??ì?,SimSun" LANG="ZH-CN">（</font>StackNode<font FACE="??ì?,SimSun" LANG="ZH-CN">））</font>;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
s->data=x;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
s->next=top;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
top=s;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
return OK;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">⑷</font>
<font FACE="??ì?,SimSun" LANG="ZH-CN">出栈</font></b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>LinkStack
Pop_LStack (LinkStack top, datatype *x)</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>{
</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
</b></font><font size="5" color="#FFFFFF"><b>StackNode *p;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
if <font FACE="??ì?,SimSun" LANG="ZH-CN">（</font>top= =NULL<font FACE="??ì?,SimSun" LANG="ZH-CN">）</font>
</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
return ERROR;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
</b></font><font size="5" color="#FFFFFF"><b>else </b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
</b></font><font size="5" color="#FFFFFF"><b>{ </b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>
</b></font><font size="5" color="#FFFFFF"><b> *x = top->data;</b></font></p>
<blockquote>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"> <b><font size="5" color="#FFFFFF">p
= top;</font></b></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> top
= top->next;</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> free
(p);</b></font></p>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> return
OK;</b></font></p>
</blockquote>
<p ALIGN="JUSTIFY" style="margin-top: 0; margin-bottom: 0">
<b><font size="5" color="#FFFFFF">}</font></b></p>
<p style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> }</b></font></p>
<p> </p>
<p ALIGN="center"><b><a href="ds3.1.HTM"><font face="??ì?,SimSun" lang="ZH-CN" size="5" color="#FFFF00">返回</font></a></b></p>
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