锘??xml version="1.0" encoding="utf-8" standalone="yes"?>久久er国产精品免费观看8,99久久777色,久久国产乱子伦精品免费强http://www.shnenglu.com/foobar/zh-cnSat, 28 Jun 2025 12:42:13 GMTSat, 28 Jun 2025 12:42:13 GMT60Advanced Test in C: The 0x10 Best Questions for C Programmers http://www.shnenglu.com/foobar/archive/2007/12/03/37683.htmlfoobarfoobarMon, 03 Dec 2007 07:12:00 GMThttp://www.shnenglu.com/foobar/archive/2007/12/03/37683.htmlhttp://www.shnenglu.com/foobar/comments/37683.htmlhttp://www.shnenglu.com/foobar/archive/2007/12/03/37683.html#Feedback0http://www.shnenglu.com/foobar/comments/commentRss/37683.htmlhttp://www.shnenglu.com/foobar/services/trackbacks/37683.htmlAdvanced Test in C: The 0x10 Best Questions for C Programmers


foobar 2007-12-03 15:12 鍙戣〃璇勮
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闅愯棌http://www.shnenglu.com/foobar/archive/2007/11/23/37221.htmlfoobarfoobarFri, 23 Nov 2007 12:44:00 GMThttp://www.shnenglu.com/foobar/archive/2007/11/23/37221.htmlhttp://www.shnenglu.com/foobar/comments/37221.htmlhttp://www.shnenglu.com/foobar/archive/2007/11/23/37221.html#Feedback0http://www.shnenglu.com/foobar/comments/commentRss/37221.htmlhttp://www.shnenglu.com/foobar/services/trackbacks/37221.html 

#include <iostream.h>
class Base
{
public:
virtual void f(float x){ cout << "Base::f(float) " << x << endl; }
void g(float x){ cout << "Base::g(float) " << x << endl; }
void h(float x){ cout << "Base::h(float) " << x << endl; }
};
class Derived : public Base
{
public:
virtual void f(float x){ cout << "Derived::f(float) " << x << endl; }
void g(int x){ cout << "Derived::g(int) " << x << endl; }
void h(float x){ cout << "Derived::h(float) " << x << endl; }
};

void main(void)
{
Derived d;
Base 
*pb = &d;
Derived 
*pd = &d;
// Good : behavior depends solely on type of the object
pb->f(3.14f); // Derived::f(float) 3.14
pd->f(3.14f); // Derived::f(float) 3.14
// Bad : behavior depends on type of the pointer
pb->g(3.14f); // Base::g(float) 3.14
pd->g(3.14f); // Derived::g(int) 3 (surprise!)
// Bad : behavior depends on type of the pointer
pb->h(3.14f); // Base::h(float) 3.14 (surprise!)
pd->h(3.14f); // Derived::h(float) 3.14
}

class Base
{
public:
void f(int x);
};
class Derived : public Base
{
public:
void f(char *str);
};
void Test(void)
{
Derived 
*pd = new Derived;
pd
->f(10); // error
//why?            
just imagine multiple inheritance
}


foobar 2007-11-23 20:44 鍙戣〃璇勮
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闅愬紡綾誨瀷杞崲瀵艱嚧閲嶈澆鍑芥暟浜х敓浜屼箟鎬?/title><link>http://www.shnenglu.com/foobar/archive/2007/11/23/37220.html</link><dc:creator>foobar</dc:creator><author>foobar</author><pubDate>Fri, 23 Nov 2007 12:35:00 GMT</pubDate><guid>http://www.shnenglu.com/foobar/archive/2007/11/23/37220.html</guid><wfw:comment>http://www.shnenglu.com/foobar/comments/37220.html</wfw:comment><comments>http://www.shnenglu.com/foobar/archive/2007/11/23/37220.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/foobar/comments/commentRss/37220.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/foobar/services/trackbacks/37220.html</trackback:ping><description><![CDATA[<p> </p> <div style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><span style="COLOR: #008080"> 1</span> <span style="COLOR: #000000"># include </span><span style="COLOR: #000000"><</span><span style="COLOR: #000000">iostream.h</span><span style="COLOR: #000000">></span><span style="COLOR: #000000"><br></span><span style="COLOR: #008080"> 2</span> <span style="COLOR: #000000"></span><span style="COLOR: #0000ff">void</span><span style="COLOR: #000000"> output( </span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000"> x); </span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> 鍑芥暟澹版槑</span><span style="COLOR: #008000"><br></span><span style="COLOR: #008080"> 3</span> <span style="COLOR: #008000"></span><span style="COLOR: #0000ff">void</span><span style="COLOR: #000000"> output( </span><span style="COLOR: #0000ff">float</span><span style="COLOR: #000000"> x); </span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> 鍑芥暟澹版槑</span><span style="COLOR: #008000"><br></span><span style="COLOR: #008080"> 4</span> <span style="COLOR: #008000"></span><span style="COLOR: #0000ff">void</span><span style="COLOR: #000000"> output( </span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000"> x)<br></span><span style="COLOR: #008080"> 5</span> <span style="COLOR: #000000">{<br></span><span style="COLOR: #008080"> 6</span> <span style="COLOR: #000000">cout </span><span style="COLOR: #000000"><<</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"> output int </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000"><<</span><span style="COLOR: #000000"> x </span><span style="COLOR: #000000"><<</span><span style="COLOR: #000000"> endl ;<br></span><span style="COLOR: #008080"> 7</span> <span style="COLOR: #000000">}<br></span><span style="COLOR: #008080"> 8</span> <span style="COLOR: #000000"></span><span style="COLOR: #0000ff">void</span><span style="COLOR: #000000"> output( </span><span style="COLOR: #0000ff">float</span><span style="COLOR: #000000"> x)<br></span><span style="COLOR: #008080"> 9</span> <span style="COLOR: #000000">{<br></span><span style="COLOR: #008080">10</span> <span style="COLOR: #000000">cout </span><span style="COLOR: #000000"><<</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"> output float </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000"><<</span><span style="COLOR: #000000"> x </span><span style="COLOR: #000000"><<</span><span style="COLOR: #000000"> endl ;<br></span><span style="COLOR: #008080">11</span> <span style="COLOR: #000000">}<br></span><span style="COLOR: #008080">12</span> <span style="COLOR: #000000"></span><span style="COLOR: #0000ff">void</span><span style="COLOR: #000000"> main(</span><span style="COLOR: #0000ff">void</span><span style="COLOR: #000000">)<br></span><span style="COLOR: #008080">13</span> <span style="COLOR: #000000">{<br></span><span style="COLOR: #008080">14</span> <span style="COLOR: #000000"></span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000"> x </span><span style="COLOR: #000000">=</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">;<br></span><span style="COLOR: #008080">15</span> <span style="COLOR: #000000"></span><span style="COLOR: #0000ff">float</span><span style="COLOR: #000000"> y </span><span style="COLOR: #000000">=</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000">1.0</span><span style="COLOR: #000000">;<br></span><span style="COLOR: #008080">16</span> <span style="COLOR: #000000">output(x); </span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> output int 1</span><span style="COLOR: #008000"><br></span><span style="COLOR: #008080">17</span> <span style="COLOR: #008000"></span><span style="COLOR: #000000">output(y); </span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> output float 1</span><span style="COLOR: #008000"><br></span><span style="COLOR: #008080">18</span> <span style="COLOR: #008000"></span><span style="COLOR: #000000">output(</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">); </span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> output int 1<br></span><span style="COLOR: #008080">19</span> <span style="COLOR: #008000"></span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> output(0.5); </span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> error! ambiguous call, 鍥犱負鑷姩綾誨瀷杞崲</span><span style="COLOR: #008000"><br></span><span style="COLOR: #008080">20</span> <span style="COLOR: #008000"></span><span style="COLOR: #000000">output(</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">(</span><span style="COLOR: #000000">0.5</span><span style="COLOR: #000000">)); </span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> output int 0</span><span style="COLOR: #008000"><br></span><span style="COLOR: #008080">21</span> <span style="COLOR: #008000"></span><span style="COLOR: #000000">output(</span><span style="COLOR: #0000ff">float</span><span style="COLOR: #000000">(</span><span style="COLOR: #000000">0.5</span><span style="COLOR: #000000">)); </span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> output float 0.5</span><span style="COLOR: #008000"><br></span><span style="COLOR: #008080">22</span> <span style="COLOR: #008000"></span><span style="COLOR: #000000">}</span></div> <img src ="http://www.shnenglu.com/foobar/aggbug/37220.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/foobar/" target="_blank">foobar</a> 2007-11-23 20:35 <a href="http://www.shnenglu.com/foobar/archive/2007/11/23/37220.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>鏁扮粍閫鍖栦負鎸囬拡http://www.shnenglu.com/foobar/archive/2007/11/23/37218.htmlfoobarfoobarFri, 23 Nov 2007 12:22:00 GMThttp://www.shnenglu.com/foobar/archive/2007/11/23/37218.htmlhttp://www.shnenglu.com/foobar/comments/37218.htmlhttp://www.shnenglu.com/foobar/archive/2007/11/23/37218.html#Feedback0http://www.shnenglu.com/foobar/comments/commentRss/37218.htmlhttp://www.shnenglu.com/foobar/services/trackbacks/37218.html{
cout<< sizeof(a) << endl; // 4 瀛楄妭鑰屼笉鏄?00 瀛楄妭
}

foobar 2007-11-23 20:22 鍙戣〃璇勮
]]>
atexit -- function to be executed on exithttp://www.shnenglu.com/foobar/archive/2007/11/15/36729.htmlfoobarfoobarThu, 15 Nov 2007 15:47:00 GMThttp://www.shnenglu.com/foobar/archive/2007/11/15/36729.htmlhttp://www.shnenglu.com/foobar/comments/36729.htmlhttp://www.shnenglu.com/foobar/archive/2007/11/15/36729.html#Feedback0http://www.shnenglu.com/foobar/comments/commentRss/36729.htmlhttp://www.shnenglu.com/foobar/services/trackbacks/36729.html
int atexit ( void ( * function ) (void) );               <cstdlib>

 The function pointed by the function pointer argument is called when the program terminates normally.

If more than one atexit function has been specified by different calls to this function, they are all executed in reverse order as a stack, i.e. the last function specified is the first to be executed at exit.

One single function can be registered to be executed at exit more than once.

C++ implementations are required to support the registration of at least 32 atexit functions.

Parameters

function
Function to be called. The function has to return no value and accept no arguments.

Return Value

A zero value is returned if the function was successfully registered, or a non-zero value if it failed.

Example

/* atexit example */
            #include <stdio.h>
            #include <stdlib.h>
            void fnExit1 (void)
            {
            puts ("Exit function 1.");
            }
            void fnExit2 (void)
            {
            puts ("Exit function 2.");
            }
            int main ()
            {
            atexit (fnExit1);
            atexit (fnExit2);
            puts ("Main function.");
            return 0;
            }
            

Output:

            Main function.
Exit function 2.
Exit function 1.



foobar 2007-11-15 23:47 鍙戣〃璇勮
]]>
Gotchas in the C++ programing languagehttp://www.shnenglu.com/foobar/archive/2007/06/04/25442.htmlfoobarfoobarMon, 04 Jun 2007 03:11:00 GMThttp://www.shnenglu.com/foobar/archive/2007/06/04/25442.htmlhttp://www.shnenglu.com/foobar/comments/25442.htmlhttp://www.shnenglu.com/foobar/archive/2007/06/04/25442.html#Feedback0http://www.shnenglu.com/foobar/comments/commentRss/25442.htmlhttp://www.shnenglu.com/foobar/services/trackbacks/25442.htmlInitializer lists

In C++, it is the order of the class inheritance and of the member variables that determine the initialization order, not the order of an initializer list:



#include 
<iostream>

class CSomeClass
{
public:
CSomeClass(
int n)
{
std::cout 
<< "CSomeClass constructor with value ";
std::cout 
<< n << std::endl;
}

}
;

class CSomeOtherClass
{
public:
CSomeOtherClass() 
//In this example, despite the list order,
: obj2(2), obj1(1//obj1 will be initialized before obj2.
{
//Do nothing.
}

private:
CSomeClass obj1;
CSomeClass obj2;
}
;

int main(void)
{
CSomeOtherClass obj;
return 0;
}



foobar 2007-06-04 11:11 鍙戣〃璇勮
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