fig23_22.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. 23.22: Fig23_22.cpp
// Standard Library class map test program.
#include <iostream>
using std::cout;
using std::endl;

#include <map> // map class-template definition

// define short name for map type used in this program
typedef std::map< int, double, std::less< int > > Mid;

int main()
{
   Mid pairs;

   // insert eight value_type objects in pairs
   pairs.insert( Mid::value_type( 15, 2.7 ) );
   pairs.insert( Mid::value_type( 30, 111.11 ) );
   pairs.insert( Mid::value_type( 5, 1010.1 ) );
   pairs.insert( Mid::value_type( 10, 22.22 ) );
   pairs.insert( Mid::value_type( 25, 33.333 ) );
   pairs.insert( Mid::value_type( 5, 77.54 ) ); // dup ignored
   pairs.insert( Mid::value_type( 20, 9.345 ) );
   pairs.insert( Mid::value_type( 15, 99.3 ) ); // dup ignored

   cout << "pairs contains:\nKey\tValue\n";
   
   // use const_iterator to walk through elements of pairs
   for ( Mid::const_iterator iter = pairs.begin();        
      iter != pairs.end(); ++iter )                       
      cout << iter->first << '\t' << iter->second << '\n';

   pairs[ 25 ] = 9999.99; // use subscripting to change value for key 25
   pairs[ 40 ] = 8765.43; // use subscripting to insert value for key 40
   
   cout << "\nAfter subscript operations, pairs contains:\nKey\tValue\n";
   
   // use const_iterator to walk through elements of pairs
   for ( Mid::const_iterator iter2 = pairs.begin();
      iter2 != pairs.end(); ++iter2 )           
      cout << iter2->first << '\t' << iter2->second << '\n';
                          
   cout << endl;
   return 0;
} // end main


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