Home »
C++ STL
C++ STL Vector Iterators with Example
C++ STL Vector Iterators: Here, we are going to learn about the various vector iterators in C++ STL with Example.
By IncludeHelp Last updated : December 11, 2023
C++ STL Vector Iterators
Following are the iterators (public member functions) in C++ STL which can be used to access the elements,
| Iterator (public member function) |
Description |
| vector::begin() |
It returns an iterator pointing to the beginning (first) element of the vector. |
| vector::end() |
It returns an iterator pointing to the past-the-element of the vector. |
| vector::rbegin() |
It returns a reverse iterator pointing to the reverse beginning element of the vector |
| vector::rend() |
It returns a reverse iterator pointing to the element preceding the first element of the vector (known as reverse ending). |
| vector::cbegin() |
It returns a const iterator pointing to the beginning element of the vector. |
| vector::cend() |
It returns a const iterator pointing to the past-the-last element of the vector. |
| vector::crbegin() |
It returns a const reverse iterator pointing to the reverse beginning element of the vector. |
| vector::crend() |
It returns a const reverse iterator pointing to the element preceding the first element of the vector (from reverse ending). |
C++ STL Vector Iterators Example
C++ STL program to demonstrate example of vector iterators.
//C++ STL program to demonstrate example of
//vector iterators
#include <iostream>
#include <vector>
using namespace std;
int main()
{
vector<int> v1;
v1.push_back(10);
v1.push_back(20);
v1.push_back(30);
v1.push_back(40);
v1.push_back(50);
//begin() and end() function
vector<int>::iterator it;
it = v1.begin();
cout << "first element is: " << *it << endl;
it = v1.end()-1;
cout << "last element is: " << *it << endl;
//rbegin() and rend() function
vector<int>::reverse_iterator rit;
rit = v1.rbegin();
cout << "first element (from reverse) is: " << *rit << endl;
rit = v1.rend()-1;
cout << "last element (from reverse) is: " << *rit << endl;
//cbegin() and cend() function
vector<int>::const_iterator cit;
cit = v1.cbegin();
cout << "first element is: " << *cit << endl;
cit = v1.cend()-1;
cout << "last element is: " << *cit << endl;
//crbegin() and crend() function
vector<int>::const_reverse_iterator crit;
crit = v1.crbegin();
cout << "first element (from reverse) is: " << *crit << endl;
crit = v1.crend()-1;
cout << "last element (from reverse) is: " << *crit << endl;
return 0;
}
Output
first element is: 10
last element is: 50
first element (from reverse) is: 50
last element (from reverse) is: 10
first element is: 10
last element is: 50
first element (from reverse) is: 50
last element (from reverse) is: 10