C++ Deque push_front()

C++ Deque push_front() function inserts new element in the beginning of the deque container and the size of the container is increased by one.

Syntax

Parameter

val: New value to be added in the beginning.

Return value

It does not return any value.

Example 1

Let's see a simple example

#include <iostream>
#include<deque>
using namespace std;
int main()
{
    deque<int> d={200,300,400,500};
    deque<int>::iterator itr;
    d.push_front(100);
    for(itr=d.begin();itr!=d.end();++itr)
    cout<<*itr<<" ";
    return 0;
   }

Output:

100 200 300 400 500

In this example, push_front() function adds new element i.e 100 before the first element 200.

Example 2

Let's see a simple example

#include <iostream>
#include<deque>
using namespace std;
int main()
{
    deque<string> d={"is","a","programming","language"};
    deque<string>::iterator itr;
    d.push_front("java");
    for(itr=d.begin();itr!=d.end();++itr)
    cout<<*itr<<" ";
    return 0;
  }

Output:

java is a programming language

In this example, push_front() function adds new string i.e "java" before the first string "is".

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C++ Deque Function