- //文件名:CHAPTER9-21.cpp
- #include <set>
- #include <iostream>
- #if _MSC_VER > 1020 // if VC++ version is > 4.2
- using namespace std; // std c++ libs implemented in std
- #endif
- int main( )
- { set <int> s1;
- s1.insert( 1 );
- s1.insert( 2 );
- cout << "The size of the set is initially " << s1.size( )<< "." << endl;
- s1.clear( );
- cout << "The size of the set after clearing is "<< s1.size( ) << "." << endl;
- }