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<P> </P>
<P><SPAN style="COLOR: #ff0000">開(kāi)始之前必須明確strlen的含義，原型為size_t strlen( char *str );
strlen返回字符串的長(zhǎng)度，即null(\0)之前的字符的數(shù)量。</SPAN></P>
<P>一 char* 與 char []</P>
<P>實(shí)例加注釋：</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++對(duì)象模型][4]指針與字符串 - iTech's Blog - 博客園.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++對(duì)象模型][4]指針與字符串 - iTech's Blog - 博客園.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> </SPAN><SPAN
style="COLOR: #0000ff">char</SPAN><SPAN
style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #000000">*</SPAN><SPAN
style="COLOR: #000000">c1 </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> </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常量區(qū)，c1在棧上, 常量區(qū)程序結(jié)束后自動(dòng)釋放。 <BR>
</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"> </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> </SPAN><SPAN
style="COLOR: #0000ff">char</SPAN><SPAN style="COLOR: #000000"> c2[]
</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> </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都在棧上</SPAN><SPAN style="COLOR: #008000">
<BR></SPAN><SPAN style="COLOR: #000000"> c2[</SPAN><SPAN
style="COLOR: #800080">1</SPAN><SPAN style="COLOR: #000000">] </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </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"> </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"> </SPAN><SPAN
style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> jj </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </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> </SPAN><SPAN
style="COLOR: #0000ff">char</SPAN><SPAN
style="COLOR: #000000"> </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"> </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 棧上</SPAN><SPAN
style="COLOR: #008000"> <BR></SPAN><SPAN
style="COLOR: #000000"> 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"> c3[</SPAN><SPAN
style="COLOR: #800080">1</SPAN><SPAN style="COLOR: #000000">] </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </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"> </SPAN><SPAN
style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> x </SPAN><SPAN
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