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width="89%"><!-- InstanceBeginEditable name="EditRegion4" --><SPAN
class=s14><STRONG>习题八</STRONG></SPAN><!-- InstanceEndEditable --></TD></TR>
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<DIV align=center>第9章 C++的异常处理</DIV></TD></TR>
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<P class=xt12>9.1 编写一个“Pastm”异常类型的处理程序，如果[
]运算符在string对象中检测到一个字符-按字典顺序在‘m’之后的小写字母，该异常处理程序就在屏幕上显示一个错误。<BR>#include
<fstream.h><BR>#include <iostream.h><BR>#include
<stdlib.h><BR>void main(int argc, char **
argv)<BR>{<BR> ifstream source(argv[1]); //打开文件<BR> char
line[128];<BR> try{<BR> if(source.fail())<BR> throw
argv[1];<BR> }<BR> catch(char* s)<BR> {<BR> cout
<<"error opening the file "<<s
<<endl;<BR> exit(1);<BR> }<BR> while(!source.eof())<BR> {<BR> source.getline(line,
sizeof(line));<BR> cout <<line
<<endl;<BR> }<BR> source.close();<BR>}</P>
<P class=xt12>9.2 设有下列类声明：<BR>class
A<BR>{<BR> public:<BR> A()<BR> {<BR> n=new
int;<BR> init();<BR> }<BR> private:<BR> int
n;<BR>};<BR>写出init()引发异常的处理程序。<BR>#include
<iostream.h><BR>class A<BR>{<BR> public:<BR> class
Error{};<BR> A()<BR> {<BR> n = new
int;<BR> init();<BR> }<BR> private:<BR> int* n;<BR> void
init()<BR> {<BR> //do something ...<BR> throw
Error();<BR> }<BR>};<BR>void main()<BR>{<BR> try{<BR> A
a;<BR> }<BR> catch(A::Error&)<BR> {<BR> cout
<<"error when
initialize.\n";<BR> }<BR>}<BR></P></TD></TR></TBODY></TABLE><!-- InstanceEndEditable --></TD></TR></TBODY></TABLE></TD></TR>
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<DIV align=center><BR><FONT color=#ffffff>Copyright© 2004-2005 Depart of
Computer Science & Technology Nuist</FONT></DIV></TD>
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