How to insert an element in array in C++

C-Plus-Plus-array

In this article, we are going to learn How to insert an element in array in C++. We will learn how to insert an element into an existing array. Arrays are not dynamic data structures and they have fix sizes. Here we will try to add a new element to the existing array at a specific position given by the user.

How to insert an element in array in C++

  • We first accept the size of the array from the user.
  • Next, we will ask the user to enter the elements as per the size given.
  • We will ask users to provide the element that they want to insert.
  • We will ask users to provide the position at which they want to add an element.
  • We will make sure this position is not beyond the array size. If the position is invalid we display an error to the user.
  • If the position is valid we shift the elements from the position given by the user and insert the element at that position.
  • We also increase the size of the array by 1.
  • We can print the array and confirm the element is added.

How to insert an element in array in C++ 

#include <iostream>
#define MAX_SIZE 250 
using namespace std;
 
int main()
{
    int Array[MAX_SIZE];
	int Size;
    int ElementoAdd,AtPosition;
 
    cout<<"Please enter size of the array (Max 250): ";
    cin>>Size;
	
    cout<<"Please enter elements in array: ";
    for(int i=0; i<Size; i++)
    {
        cin>>Array[i];
    }
 
    
    cout<<"Please Enter the element You want to insert : ";
    cin>>ElementoAdd;
    cout<<"Please Enter the Position where you want to add : ";
    cin>>AtPosition;

 
    if(AtPosition > Size+1 || AtPosition <= 0)
    {
        cout<<"Please enter position between 1 to "<<Size;
    }
    else
    {
        for(int i=Size; i >= AtPosition; i--)
        {
            Array[i] = Array[i-1];
        }
        Array[AtPosition-1] = ElementoAdd;
        Size++;
    }
	
	cout<<"New Array with the elements after insertion : ";
    for(int i=0; i<Size; i++)
    {
       cout<<Array[i]<<"\t";
    }
 
    return 0;
}

Output

Please enter size of the array (Max 250): 6
Please enter elements in array: 12
13
6
9
3
1
Please Enter the element You want to insert : 777
Please Enter the Position where you want to add : 2
New Array with the elements after insertion : 12	777	13	6	9	3	1

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