//文件名:CHAPTER7-22.cpp
#include <deque>
#include <iostream>
#if _MSC_VER > 1020   // if VC++ version is > 4.2
   using namespace std;  // std c++ libs implemented in std
#endif
int main( ) 
{
   using namespace std;
   deque <int> c1, c2;
   c1.push_back( 1 );
   c2.push_back( 1 );
   if ( c1 == c2 ) cout << "The deques are equal." << endl;
   else cout << "The deques are not equal." << endl;
   c1.push_back( 1 );
   if ( c1 == c2 ) cout << "The deques are equal." << endl;
   else cout << "The deques are not equal." << endl;
return 0;
}