maps.cpp

#include <iostream> 
#include <map> 
#include <iterator> 
using namespace std; 
int main() 
{ 
    map <int, int> gquiz1;        // empty map container 
  
    // insert elements in random order 
    gquiz1.insert(pair <int, int> (1, 40)); 
    gquiz1.insert(pair <int, int> (2, 30)); 
    gquiz1.insert(pair <int, int> (3, 60)); 
    gquiz1.insert(pair <int, int> (4, 20)); 
    gquiz1.insert(pair <int, int> (5, 50)); 
    gquiz1.insert(pair <int, int> (6, 50));  
    gquiz1.insert(pair <int, int> (7, 10)); 
  
    // printing map gquiz1 
    map <int, int> :: iterator itr; 
    cout << "\nThe map gquiz1 is : \n"; 
    cout << "\tKEY\tELEMENT\n"; 
    for (itr = gquiz1.begin(); itr != gquiz1.end(); ++itr) 
    { 
        cout  <<  '\t' << itr->first
              <<  '\t' << itr->second << '\n'; 
    } 
    cout << endl; 
  
    // assigning the elements from gquiz1 to gquiz2 
    map <int, int> gquiz2(gquiz1.begin(), gquiz1.end()); 
  
    // print all elements of the map gquiz2 
    cout << "\nThe map gquiz2 after assign from gquiz1 is : \n"; 
    cout << "\tKEY\tELEMENT\n"; 
    for (itr = gquiz2.begin(); itr != gquiz2.end(); ++itr) 
    { 
        cout  <<  '\t' << itr->first  
              <<  '\t' << itr->second << '\n'; 
    } 
    cout << endl; 
  
    // remove all elements up to element with key=3 in gquiz2 
    cout << "\ngquiz2 after removal of elements less than key=3 : \n"; 
    cout << "\tKEY\tELEMENT\n"; 
    gquiz2.erase(gquiz2.begin(), gquiz2.find(3)); 
    for (itr = gquiz2.begin(); itr != gquiz2.end(); ++itr) 
    { 
        cout  <<  '\t' << itr->first  
              <<  '\t' << itr->second << '\n'; 
    } 
  
    // remove all elements with key = 4 
    int num; 
    num = gquiz2.erase (4); 
    cout << "\ngquiz2.erase(4) : "; 
    cout << num << " removed \n" ; 
    cout << "\tKEY\tELEMENT\n"; 
    for (itr = gquiz2.begin(); itr != gquiz2.end(); ++itr) 
    { 
        cout  <<  '\t' << itr->first  
              <<  '\t' << itr->second << '\n'; 
    } 
  
    cout << endl; 
  
    //lower bound and upper bound for map gquiz1 key = 5 
    cout << "gquiz1.lower_bound(5) : " << "\tKEY = "; 
    cout << gquiz1.lower_bound(5)->first << '\t'; 
    cout << "\tELEMENT = " << gquiz1.lower_bound(5)->second << endl; 
    cout << "gquiz1.upper_bound(5) : " << "\tKEY = "; 
    cout << gquiz1.upper_bound(5)->first << '\t'; 
    cout << "\tELEMENT = " << gquiz1.upper_bound(5)->second << endl; 
      
    return 0; 
  
}