map.cpp

#include <iostream> 
#include <iterator> 
#include <map> 

using namespace std; 

int main() 
{ 

	// empty map container 
	map<int, int> gquiz1; 

	// 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; 
}