C++ Deque back() Usage and Example

C++ Deque (Double-ended Queue)

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

Syntax

reference back();

Parameters

It does not contain any parameters.

Return value

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

Example1

Let's look at a simple example

Example

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

Output:

5

In this example, the back() function returns the last element of the deque, that is5.

Example2

Let's look at another simple example

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 the deque: ";
　　for(itr = n.begin(); itr != n.end();++itr)
　　cout <<*itr << " \t ";
　　return 0;
}

Output:

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

C++ Deque (Double-ended Queue)