typeid_1.cpp

最新推荐文章于 2024-02-04 18:11:24 发布

原创最新推荐文章于 2024-02-04 18:11:24 发布 · 419 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#literals #class #include #float #c

T 专栏收录该内容

41 篇文章

订阅专栏

name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <iostream.h>
#include <typeinfo.h>

class A { };
class B : A { };

void main(void)
{
char C;
float X;

   //USE THE typeinfo::operator == () TO MAKE COMPARISON
   if (typeid( C ) == typeid( X ))
      cout << "C and X are the same type." << endl;
   else
      cout << "C and X are NOT the same type." << endl;

   // USE true AND false LITERALS TO MAKE COMPARISON
   cout << typeid(int).name();
   cout << " before " << typeid(double).name() << ": " <<
        (typeid(int).before(typeid(double)) ? true : false) << endl;
   cout << typeid(double).name();
   cout << " before " << typeid(int).name() << ": " <<
        (typeid(double).before(typeid(int)) ? true : false) << endl;
   cout << typeid(A).name();
   cout << " before " << typeid(B).name() << ": " <<
        (typeid(A).before(typeid(B)) ? true : false) << endl;
}