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<H1 class=postTitle><A class=postTitle2 id=AjaxHolder_ctl01_TitleUrl 
href="http://www.cnblogs.com/itech/archive/2009/02/22/1395491.html">[C++对象模型][4]指针与字符串</A> 
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<P>&nbsp;</P>
<P><SPAN style="COLOR: #ff0000">开始之前必须明确strlen的含义，原型为size_t strlen( char *str ); 
strlen返回字符串的长度，即null(\0)之前的字符的数量。</SPAN></P>
<P>一 char* 与 char []</P>
<P>实例加注释：</P>
<DIV class=cnblogs_code><IMG id=Code_Closed_Image_145503 style="DISPLAY: none" 
onclick="this.style.display='none'; document.getElementById('Code_Closed_Text_145503').style.display='none'; document.getElementById('Code_Open_Image_145503').style.display='inline'; document.getElementById('Code_Open_Text_145503').style.display='inline';" 
height=16 
src="[C++对象模型][4]指针与字符串 - iTech's Blog - 博客园.files/ContractedBlock.gif" width=11 
align=top><IMG id=Code_Open_Image_145503 
onclick="this.style.display='none'; document.getElementById('Code_Open_Text_145503').style.display='none'; getElementById('Code_Closed_Image_145503').style.display='inline'; getElementById('Code_Closed_Text_145503').style.display='inline';" 
height=16 
src="[C++对象模型][4]指针与字符串 - iTech's Blog - 博客园.files/ExpandedBlockStart.gif" 
width=11 align=top><SPAN class=cnblogs_code_Collapse 
id=Code_Closed_Text_145503>Code</SPAN><SPAN id=Code_Open_Text_145503> <BR><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN 
style="COLOR: #0000ff">void</SPAN><SPAN style="COLOR: #000000"> 
TestCharPointerAndArray() <BR>{ <BR>&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="COLOR: #0000ff">char</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN style="COLOR: #000000">*</SPAN><SPAN 
style="COLOR: #000000">c1 </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN 
style="COLOR: #800000">abc</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN 
style="COLOR: #000000">; </SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN 
style="COLOR: #008000">abc\0常量区，c1在栈上, 常量区程序结束后自动释放。 <BR>&nbsp;&nbsp;&nbsp; 
</SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000">c1[1] 
= 'g'; </SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN 
style="COLOR: #008000"> 常量不能修改</SPAN><SPAN style="COLOR: #008000"> 
<BR></SPAN><SPAN style="COLOR: #000000">&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> i </SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> strlen(c1); 
</SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000"> 
3</SPAN><SPAN style="COLOR: #008000"> <BR></SPAN><SPAN 
style="COLOR: #000000"><BR>&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="COLOR: #0000ff">char</SPAN><SPAN style="COLOR: #000000"> c2[] 
</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN 
style="COLOR: #800000">abc</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN 
style="COLOR: #000000">; </SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN 
style="COLOR: #008000"> c2，abc\0都在栈上</SPAN><SPAN style="COLOR: #008000"> 
<BR></SPAN><SPAN style="COLOR: #000000">&nbsp;&nbsp;&nbsp; c2[</SPAN><SPAN 
style="COLOR: #800080">1</SPAN><SPAN style="COLOR: #000000">] </SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #800000">'</SPAN><SPAN style="COLOR: #800000">g</SPAN><SPAN 
style="COLOR: #800000">'</SPAN><SPAN style="COLOR: #000000">; </SPAN><SPAN 
style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000"> 可以修改</SPAN><SPAN 
style="COLOR: #008000"> <BR></SPAN><SPAN 
style="COLOR: #000000">&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> j </SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> strlen(c2); 
</SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000"> 
3</SPAN><SPAN style="COLOR: #008000"> <BR></SPAN><SPAN 
style="COLOR: #000000">&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> jj </SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">sizeof</SPAN><SPAN style="COLOR: #000000">(c2); 
</SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000"> 
4</SPAN><SPAN style="COLOR: #008000"> <BR></SPAN><SPAN 
style="COLOR: #000000"><BR>&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="COLOR: #0000ff">char</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN style="COLOR: #000000">*</SPAN><SPAN 
style="COLOR: #000000">c3 </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN 
style="COLOR: #000000"> ( </SPAN><SPAN style="COLOR: #0000ff">char</SPAN><SPAN 
style="COLOR: #000000">*</SPAN><SPAN style="COLOR: #000000"> 
)malloc(</SPAN><SPAN style="COLOR: #800080">4</SPAN><SPAN 
style="COLOR: #000000">*</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">sizeof</SPAN><SPAN style="COLOR: #000000">(</SPAN><SPAN 
style="COLOR: #0000ff">char</SPAN><SPAN style="COLOR: #000000">)); </SPAN><SPAN 
style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000"> c3 栈上</SPAN><SPAN 
style="COLOR: #008000"> <BR></SPAN><SPAN 
style="COLOR: #000000">&nbsp;&nbsp;&nbsp; memcpy(c3,</SPAN><SPAN 
style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">abc</SPAN><SPAN 
style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">,</SPAN><SPAN 
style="COLOR: #800080">4</SPAN><SPAN style="COLOR: #000000">); </SPAN><SPAN 
style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000"> abc\0 在堆上, 4 = 
3(strlen("abc")) + 1('\0');</SPAN><SPAN style="COLOR: #008000"> <BR></SPAN><SPAN 
style="COLOR: #000000">&nbsp;&nbsp;&nbsp; c3[</SPAN><SPAN 
style="COLOR: #800080">1</SPAN><SPAN style="COLOR: #000000">] </SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #800000">'</SPAN><SPAN style="COLOR: #800000">g</SPAN><SPAN 
style="COLOR: #800000">'</SPAN><SPAN style="COLOR: #000000">; </SPAN><SPAN 
style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000"> 可以修改</SPAN><SPAN 
style="COLOR: #008000"> <BR></SPAN><SPAN 
style="COLOR: #000000">&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> x </SPAN><SPAN
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