pr22020.cpp

来自「c++编程宝典源码及Quincy99编译器 是《标准C++编程宝典》电子工业出」· C++ 代码 · 共 66 行

////////////////////////////////////////
// File Name: pr22020.cpp
////////////////////////////////////////
#include <iostream>
#include <map>

typedef std::multimap<int, char> MYMAP;

int main()
{
    // Create the first multimap object.
    MYMAP charMultimap;

    // Populate the multimap with values.
    charMultimap.insert(MYMAP::value_type(1,'A'));
    charMultimap.insert(MYMAP::value_type(4,'C'));
    charMultimap.insert(MYMAP::value_type(2,'B'));
    charMultimap.insert(MYMAP::value_type(7,'E'));
    charMultimap.insert(MYMAP::value_type(5,'D'));
    charMultimap.insert(MYMAP::value_type(3,'B'));
    charMultimap.insert(MYMAP::value_type(6,'D'));

    // Display the contents of the first multimap.
    std::cout << "Contents of first multimap: " << std::endl;
    MYMAP::iterator iter;
    for (iter = charMultimap.begin();
            iter != charMultimap.end(); iter++)
    {
        std::cout << (*iter).first << " --> ";
        std::cout << (*iter).second << std::endl;
    }
    std::cout << std::endl;

    // Create the second multimap object.
    MYMAP charMultimap2;

    // Populate the second multimap with values.
    charMultimap2.insert(MYMAP::value_type(1,'C'));
    charMultimap2.insert(MYMAP::value_type(4,'F'));
    charMultimap2.insert(MYMAP::value_type(2,'D'));
    charMultimap2.insert(MYMAP::value_type(7,'E'));
    charMultimap2.insert(MYMAP::value_type(5,'F'));
    charMultimap2.insert(MYMAP::value_type(3,'E'));
    charMultimap2.insert(MYMAP::value_type(6,'G'));

    // Display the contents of the second multimap.
    std::cout << "Contents of second multimap: " << std::endl;
    for (iter = charMultimap2.begin();
            iter != charMultimap2.end(); iter++)
    {
        std::cout << (*iter).first << " --> ";
        std::cout << (*iter).second << std::endl;
    }
    std::cout << std::endl;

    // Compare the multimaps.
    if (charMultimap == charMultimap2)
        std::cout << "multimap1 == multimap2";
    else if (charMultimap < charMultimap2)
        std::cout << "multimap1 < multimap2";
    else if (charMultimap > charMultimap2)
        std::cout << "multimap1 > multimap2";

    return 0;
}