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  1. #include <iostream>
  2. #include <map>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.   multimap <char,int> myMultimap;
  8.   map <char,int> myMap;
  9.   char c;
  10.   for (int i = 0,c = 'a'; i < 5; ++i,++c)
  11.   {
  12.       myMap[c] = i;///заполняем map
  13.   }
  14.  
  15.    ///заполняем multimap
  16.    myMultimap.insert ( pair<char,int>('c',146) );
  17.    myMultimap.insert ( pair<char,int>('a',23) );
  18.    myMultimap.insert ( pair<char,int>('b',996) );
  19.    myMultimap.insert ( pair<char,int>('a',56) );
  20.    myMultimap.insert ( pair<char,int>('c',121) );
  21.    auto itMap = myMap.begin();///создаем итератор на начало myМap
  22.    auto itMultimap = myMultimap.begin();///создаем итератор на начало myMultimap
  23.    cout<<"myMap contains: \t myMultimap contains:\n";
  24.  
  25.    ///вывод на экран myMap и myMultimap
  26.    for(itMap = myMap.begin(),itMultimap = myMultimap.begin(); itMultimap != myMultimap.end(); itMap++,itMultimap++)
  27.    {
  28.        cout << itMap->first << " : " << itMap->second << "\t\t\t\t" << itMultimap->first << " : " << itMultimap->second << endl;
  29.    }
  30.  
  31.    for(c = 'a'; c <= 'f'; c++)
  32.    {
  33.       myMap.count(c) ? cout << "\nNumber of elements '" << c << "' in myMap = " << myMap.count(c) : cout << "\nElement '" << c << "' is not in myMap ";
  34.       myMultimap.count(c) ? cout << "\nNumber of elements '" << c << "' in myMultimap " << myMultimap.count(c) : cout << "\nElement '" << c << "' is not in myMultimap";
  35.    }
  36.  
  37.    itMap = myMap.find('b');///итератор на заданный элемент в map
  38.    itMultimap = myMultimap.find('a');///итератор на заданный элемент в multimap
  39.    myMap.erase(itMap);///стираем его в map
  40.    myMultimap.erase(itMultimap);///стираем его в multimap
  41.    itMap = myMap.find('d');
  42.    itMultimap = myMultimap.find('d');
  43.    myMap.erase(itMap,myMap.end());///стираем c элемента 'd' и до конца map
  44.    myMultimap.erase(itMultimap,myMultimap.end());///стираем c элемента 'd' и до конца multimap
  45.  
  46.    cout << "\n\nmyMap contains: \t myMultimap contains:\n";
  47.    for(itMap = myMap.begin(),itMultimap = myMultimap.begin(); itMap != myMap.end(); itMap++,itMultimap++)
  48.    {
  49.       cout << itMap->first << " : " << itMap->second << "\t\t\t\t" << itMultimap->first << " : " << itMultimap->second << endl;///вывод на экран
  50.    }
  51.  
  52.    myMap.clear();
  53.    myMap.empty() ? cout << "\nmyMap is empty\n" : cout << "myMap isn't empty\n";
  54.    myMultimap.empty() ? cout << "\nmyMultimap is empty\n" : cout << "myMultimap isn't empty\n";
  55.  
  56.    return 0;
  57. }
Success #stdin #stdout 0s 4304KB
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stdin
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Standard input is empty
stdout
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myMap contains: 	 myMultimap contains:
a : 0				a : 23
b : 1				a : 56
c : 2				b : 996
d : 3				c : 146
e : 4				c : 121

Number of elements 'a' in myMap = 1
Number of elements 'a' in myMultimap 2
Number of elements 'b' in myMap = 1
Number of elements 'b' in myMultimap 1
Number of elements 'c' in myMap = 1
Number of elements 'c' in myMultimap 2
Number of elements 'd' in myMap = 1
Element 'd' is not in myMultimap
Number of elements 'e' in myMap = 1
Element 'e' is not in myMultimap
Element 'f' is not in myMap 
Element 'f' is not in myMultimap

myMap contains: 	 myMultimap contains:
a : 0				a : 56
c : 2				b : 996

myMap is empty
myMultimap isn't empty
https://ideone.com/a8TZ4l
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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