chapter9-24.cpp

C++STL程序员开发指南

//文件名:CHAPTER9-24.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( )
{  multiset <int> ms1;
   int i;
   ms1.insert( 1 );
   ms1.insert( 1 );
   ms1.insert( 2 );
   // Elements do not need to be unique in multiset,
   // so duplicates are allowed and counted.
   i = ms1.count( 1 );
   cout << "The number of elements in ms1 with a sort key of 1 is: "<< i << "." << endl;
   i = ms1.count( 2 );
   cout << "The number of elements in ms1 with a sort key of 2 is: "<< i << "." << endl;
   i = ms1.count( 3 );
   cout << "The number of elements in ms1 with a sort key of 3 is: "<< i << "." << endl;
}