C++ Vector crend() function

by Online Tutorials Library July 22, 2022

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:

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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