C++ Deque back()

C++ Deque back() function is used to access the last element of the deque container.

Syntax

Parameter

It does not contain any parameter.

Return value

It returns a reference to the last element of the deque container.

Example 1

Let's see a simple example

#include <iostream>
#include<deque>
using namespace std;
int main()
{
   deque<int> k={1,2,3,4,5};
   cout<<k.back();
   return 0;
}

Output:

In this example, back() function returns the last element of the deque i.e 5.

Example 2

Let's see a another simple example

#include <iostream>
#include<deque>
using namespace std;
int main()
{
  deque<int> n;
  deque<int>::iterator itr;
  n.push_back(15);
  while(n.back()!=0)
  {
      n.push_back(n.back()-1);
  } 
  cout<<"Content of deque:";
  for(itr=n.begin();itr!=n.end();++itr)
  cout<<*itr<<" ";
  return 0;
}

Output:

Content of deque:15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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C++ Deque Function