C++ Vector rend() function

C++ Vector rend() 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 rend()

The rend() function stands for 'reverse end' and is used to point the element preceding the first element of the vector.

Syntax

Consider a vector 'v'. Syntax would be:

reverse_iteratorritr=v.rend();

Parameter

It does not contain any parameter.

Return value

It returns a reverse iterator pointing to the reverse end of the vector container.

Example 1

Let's see a simple example.

#include 
#include
using namespace std;
int main()
{
vector v{1,2,3,4,5};
vector::reverse_iterator ritr;
for(ritr=v.rbegin();ritr!=v.rend();ritr++)
std::cout<< *ritr<<" ";
return 0;
}

Output:

5 4 3 2 1

In this example, rend() function is used to get reverse integer values contained in the vector.

Example 2

Let's see a simple example.

#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<string> v{"Computer science","electronics","electrical","mechanical"};
vector<string>::reverse_iterator ritr;
vector<string>::iterator itr;
std::cout<<"Strings are :";
for(itr=v.begin();itr!=v.end();itr++)
cout<<*itr<<", ";
cout<<'\n';
cout<<"Reverse strings are :";
for(ritr=v.rbegin();ritr!=v.rend();ritr++)
cout<<*ritr<<", ";
return 0;
}

Output:

Strings are :Computer science, electronics, mechanical
Reverse strings are :mechanical, electrical, electronics, Computer science

In this example, rend() function is used to get reverse string values contained in the vector.

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