C++ Vector begin() function

C++ Vector begin() function tutorial for beginners and professionals with examples on assign(), at(), back(), begin(), capacity(), cbegin(), cend(), clear(), crbegin(), crend(), data(), emplace(), end(), front(), rbegin(), resize(), size(), swap() etc.

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C++ Vector begin()

This function is used to point the first element of the vector.

begin() vs front()

The begin() function is used to return an iterator pointing to the first element of the vector while front() function is used to return a reference to the same element in the vector container.

Syntax

Consider a vector 'v' and syntax would be:

iterator it =v.begin();

Parameter

It does not contain any parameter.

Return value

It returns an iterator pointing to the first element of the vector.

Example 1

Let's see a simple example.

#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<char> v{'a','e','i','o','u'};
vector<char>::iterator itr;
itr=v.begin();
cout<<*itr;
return 0;
}

Output:

In this example, object of iterator 'itr' is created to access begin() function and 'itr' is of vector type containing character values.

Example 2

Let's see a another simple example.

#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<int> v{1,2,3,4,5};
vector<int>::iterator itr;
itr=v.begin()+2;
cout<<*itr;
return 0;
}

Output:

In this example, begin() function is incremented by 2 to access the third element of the vector.

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