Iterators.cpp

// C++ program to illustrate the
// iterators in vector
#include <iostream>
#include <vector>
using namespace std;

void main() {
	vector<int> g1{2,4,6,8,10};

	cout << "Output of begin and end: ";
	for (auto i = g1.begin(); i != g1.end(); ++i)
		cout << *i << " ";
	cout << "\nOutput of cbegin and cend: ";
	for (auto i = g1.cbegin(); i != g1.cend(); ++i)
		cout << *i << " ";
	cout << "\nOutput of rbegin and rend: ";
	for (auto ir = g1.rbegin(); ir != g1.rend(); ++ir)
		cout << *ir << " ";
	cout << "\nOutput of crbegin and crend : ";
	for (auto ir = g1.crbegin(); ir != g1.crend(); ++ir)
		cout << *ir << " ";

}
/*
Output:
Output of begin and end: 2 4 6 8 10
Output of cbegin and cend: 2 4 6 8 10
Output of rbegin and rend: 10 8 6 4 2
Output of crbegin and crend : 10 8 6 4 2
*/

/*
Iterators
begin() – Returns an iterator pointing to the first element in the vector
end() – Returns an iterator pointing to the theoretical element that follows the last element in the vector
rbegin() – Returns a reverse iterator pointing to the last element in the vector (reverse beginning). It moves from last to first element
rend() – Returns a reverse iterator pointing to the theoretical element preceding the first element in the vector (considered as reverse end)
cbegin() – Returns a constant iterator pointing to the first element in the vector.
cend() – Returns a constant iterator pointing to the theoretical element that follows the last element in the vector.
crbegin() – Returns a constant reverse iterator pointing to the last element in the vector (reverse beginning). It moves from last to first element
crend() – Returns a constant reverse iterator pointing to the theoretical element preceding the first element in the vector (considered as reverse end)
*/