fig20_22.cpp

来自「这是C＋＋编程经典的书上实例的源代码。 （英文名是《C＋＋ how to pr」· C++ 代码 · 共 59 行

// Fig. 20.22: fig20_22.cpp
// Testing Standard Library class map
#include <iostream>

using std::cout;
using std::endl;

#include <map>

int main()
{
   typedef std::map< int, double, std::less< int > > mid;
   mid 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 ) ); // dupe ignored
   pairs.insert( mid::value_type( 20, 9.345 ) );
   pairs.insert( mid::value_type( 15, 99.3 ) ); // dupe ignored
   cout << "pairs contains:\nKey\tValue\n";
   
   mid::const_iterator iter;

   for ( iter = pairs.begin(); iter != pairs.end(); ++iter )
      cout << iter->first << '\t' 
           << iter->second << '\n';

   pairs[ 25 ] = 9999.99;  // change existing value for 25
   pairs[ 40 ] = 8765.43;  // insert new value for 40
   cout << "\nAfter subscript operations, pairs contains:"
        << "\nKey\tValue\n";
   
   for ( iter = pairs.begin(); iter != pairs.end(); ++iter )
      cout << iter->first << '\t' 
           << iter->second << '\n';

   cout << endl;
   return 0;
}


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