ds4.1.htm

这是清华大学所用的数据结构的电子版教材

<p class="MsoNormal" style="margin-left:21.0pt;text-indent:-21.0pt;mso-list:l31 level1 lfo17;
tab-stops:list 21.0pt"><b><span lang="EN-US"><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">1、</span></font></span><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">求串长</span><span lang="EN-US">StrLength(s)</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作条件：串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">存在</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作结果：求出串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的长度。</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:-21.0pt;mso-list:l31 level1 lfo17;
tab-stops:list 21.0pt"><b><span lang="EN-US"><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">2、</span></font></span><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">串赋值</span><span lang="EN-US">StrAssign(s1,s2)</span></font></b></p>
<p class="MsoNormal" style="margin-left:72.25pt;text-indent:-51.6pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作条件：</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US"> 
s1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">是一个串变量，</span><span lang="EN-US">s2</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">或者是一个串常量，或者是一个串变量（通常</span><span lang="EN-US">s2 
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">是一个串常量时称为串赋值，是一个串变量称为串拷贝）。</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作结果：将</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s2</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的串值赋值给</span><span lang="EN-US">s1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">，</span><span lang="EN-US"> 
s1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">原来的值被覆盖掉。</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:-21.0pt;mso-list:l31 level1 lfo17;
tab-stops:list 21.0pt"><b><span lang="EN-US"><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">3、</span></font></span><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">连接操作</span> 
<span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">：</span><span lang="EN-US">StrConcat 
(s1,s2,s) </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">或</span><span lang="EN-US">StrConcat 
(s1,s2)</span></font></b></p>
<p class="MsoNormal"><span style="mso-spacerun: yes" lang="EN-US"><font color="#FFFFFF"><b><font size="5" face="宋体">&nbsp;&nbsp;&nbsp; 
</font></b></font></span><font color="#FFFFFF"><b><font size="5" face="宋体"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">操作条件：串</span><span lang="EN-US">s1,s2</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">存在。</span></font></b></font></p>
<p class="MsoNormal"><span style="mso-spacerun: yes" lang="EN-US"><font color="#FFFFFF"><b><font size="5" face="宋体">&nbsp;&nbsp;&nbsp; 
</font></b></font></span><font color="#FFFFFF"><b><font size="5" face="宋体"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">操作结果：两个串的联接就是将一个串的串值紧接着放在另一个串的后面，连接成一</span><span style="mso-spacerun: yes" lang="EN-US">&nbsp;&nbsp;&nbsp; 
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">个串。前者是产生新串</span><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">，</span><span lang="EN-US">s1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">和</span><span lang="EN-US">s2</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">不改变</span><span lang="EN-US">; 
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">后者是在</span><span lang="EN-US">s1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的后面联接</span><span lang="EN-US">s2</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的串值，</span><span lang="EN-US">s1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">改变，</span><span lang="EN-US"> 
s2</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">不改变。</span></font></b></font></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">例如：</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US"> 
s1=</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">he</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂，</span><span lang="EN-US">s2=</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span> 
<span lang="EN-US">bei</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂，前者操作结果是</span><span lang="EN-US">s=</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">he 
bei</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂；后者操作结果是</span><span lang="EN-US">s1=</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">he 
bei</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂。</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:-21.0pt;mso-list:l31 level1 lfo17;
tab-stops:list 21.0pt"><b><span lang="EN-US"><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">4、</span></font></span><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">求子串</span><span lang="EN-US">SubStr 
(s,i,len)</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">：</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作条件：串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">存在，</span><span lang="EN-US">1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">i</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">StrLength(s)</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">,</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span><span lang="EN-US">0</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">len</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">StrLength(s)-i+1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">.</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作结果：返回从串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的第</span><span lang="EN-US">i</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">个字符开始的长度为</span> 
<span lang="EN-US">len </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的子串。</span><span lang="EN-US">len=0</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">得到的是空串。</span></font></b></p>
<p class="MsoNormal"><span style="mso-spacerun: yes" lang="EN-US"><font color="#FFFFFF"><b><font size="5" face="宋体">&nbsp;&nbsp;&nbsp; 
</font></b></font></span><font color="#FFFFFF"><b><font size="5" face="宋体"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">例如：</span><span lang="EN-US">SubStr(</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">abcdefghi</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">,3,4)= 
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">cdef</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span></font></b></font></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:-21.0pt;mso-list:l31 level1 lfo17;
tab-stops:list 21.0pt"><b><span lang="EN-US"><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">5、</span></font></span><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">串比较</span>