C++ Vector crend() function

C++ Vector crend() 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 crend()

This function is used to point the element preceding the first element in the vector container. Itrefers as reverse end.

Syntax

Consider a vector 'v'. Syntax would be:

const_reverse_iterator itr=v.crend();

Parameter

It does not contain any parameter.

Return value

It returns the constant reverse iterator pointing to the reverse end in the sequence.

Example 1

Let's see a simple example.

#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<int> v{1,2,3,4,5};
vector<int>::const_reverse_iterator itr=v.crend()-2;
  *itr=9;
cout<<*itr;
return 0;
}
In this example, it shows that crend() function does not modify the value otherwise, it shows an error.

Example 2

Let's see a another simple example

#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<string>str{"java","C","C++",".Net"};
vector<string>::const_reverse_iterator itr=str.crend()-1;
std::cout<< *itr;
return 0;
}

Output:

java

In this example, crend() function access the first element of the vector container.

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