Insert Element at the End of an Array
Last Updated :
07 Nov, 2024
Given an array of integers, the task is to insert an element at the end of the array.
Examples:
Input: arr[] = [10, 20, 30, 40], ele = 50
Output: [10, 20, 30, 40, 50]
Input: arr[] = [], ele = 20
Output: [20]
[Approach 1] Using Built-In Methods
We will use library methods like push_back() in C++, add() in Java and C#, append() in Python and push() in JavaScript.
C++
// C++ program to insert given element at the end
// of an array using built-in methods
#include <iostream>
#include <vector>
using namespace std;
int main() {
vector<int> arr = {10, 20, 30, 40};
int ele = 50;
cout << "Array before insertion\n";
for (int i = 0; i < arr.size(); i++)
cout << arr[i] << " ";
// Insert element at the end
arr.push_back(ele);
cout << "\nArray after insertion\n";
for (int i = 0; i < arr.size(); i++)
cout << arr[i] << " ";
return 0;
}
// Java program to insert a given element at the end of an array
// using built-in methods
import java.util.ArrayList;
import java.util.Arrays;
class GfG {
public static void main(String[] args) {
ArrayList<Integer> arr = new
ArrayList<>(Arrays.asList(10, 20, 30, 40));
int ele = 50;
System.out.println("Array before insertion");
for (int i = 0; i < arr.size(); i++)
System.out.print(arr.get(i) + " ");
// Insert element at the end
arr.add(ele);
System.out.println("\nArray after insertion");
for (int i = 0; i < arr.size(); i++)
System.out.print(arr.get(i) + " ");
}
}
# Python program to insert a given element at the end
# of an array using built-in methods
if __name__ == "__main__":
arr = [10, 20, 30, 40]
ele = 50
print("Array before insertion")
for i in range(len(arr)):
print(arr[i], end=" ")
# Insert element at the end
arr.append(ele)
print("\nArray after insertion")
for i in range(len(arr)):
print(arr[i], end=" ")
// C# program to insert a given element at the end
// of an array using built-in methods
using System;
using System.Collections.Generic;
class GfG {
static void Main() {
List<int> arr = new List<int> { 10, 20, 30, 40 };
int ele = 50;
Console.WriteLine("Array before insertion");
foreach (int num in arr)
Console.Write(num + " ");
// Insert element at the end
arr.Add(ele);
Console.WriteLine("\nArray after insertion");
foreach (int num in arr)
Console.Write(num + " ");
}
}
// JavaScript program to insert a given element at the end
// of an array using built-in methods
let arr = [10, 20, 30, 40];
let ele = 50;
console.log("Array before insertion");
console.log(arr.join(" "));
// Insert element at the end
arr.push(ele);
console.log("Array after insertion");
console.log(arr.join(" "));
OutputArray before insertion
10 20 30 40
Array after insertion
10 20 30 40 50
Time Complexity: O(1)
Auxiliary Space: O(1)
[Approach 2] Using Custom Method
To insert an element at the end of an array, we can simply add the new element at the nth index.
C++
// C++ program to insert given element at the end
// of an array using custom methods
#include <iostream>
#include <vector>
using namespace std;
int main() {
int n = 4;
vector<int> arr = {10, 20, 30, 40, 0};
int ele = 50;
cout << "Array before insertion\n";
for (int i = 0; i < n; i++)
cout << arr[i] << " ";
arr[n] = ele;
cout << "\nArray after insertion\n";
for (int i = 0; i <= n; i++)
cout << arr[i] << " ";
return 0;
}
// C program to insert given element at the end
// of an array using custom methods
#include <stdio.h>
int main() {
int n = 4;
int arr[5] = {10, 20, 30, 40, 0};
int ele = 50;
printf("Array before insertion\n");
for (int i = 0; i < n; i++) {
printf("%d ", arr[i]);
}
// Inserting element at the end of the array
arr[n] = ele;
printf("\nArray after insertion\n");
for (int i = 0; i <= n; i++) {
printf("%d ", arr[i]);
}
return 0;
}
// Java program to insert given element at the end
// of an array using custom methods
class GfG {
public static void main(String[] args) {
int n = 4;
int[] arr = {10, 20, 30, 40, 0};
int ele = 50;
System.out.println("Array before insertion");
for (int i = 0; i < n; i++) {
System.out.print(arr[i] + " ");
}
// Inserting element at the end of the array
arr[n] = ele;
System.out.println("\nArray after insertion");
for (int i = 0; i <= n; i++) {
System.out.print(arr[i] + " ");
}
}
}
# Python program to insert given element at the end
# of an array using custom methods
if __name__ == "__main__":
n = 4
arr = [10, 20, 30, 40, 0]
ele = 50
print("Array before insertion")
for i in range(n):
print(arr[i], end=" ")
# Inserting element at the end of the array
arr[n] = ele
print("\nArray after insertion")
for i in range(n + 1):
print(arr[i], end=" ")
using System;
class GfG {
static void Main() {
int n = 4;
int[] arr = { 10, 20, 30, 40, 0 };
int ele = 50;
Console.WriteLine("Array before insertion");
for (int i = 0; i < n; i++) {
Console.Write(arr[i] + " ");
}
// Inserting element at the end of the array
arr[n] = ele;
Console.WriteLine("\nArray after insertion");
for (int i = 0; i <= n; i++) {
Console.Write(arr[i] + " ");
}
}
}
// JavaScript program to insert given element at the end
// of an array using custom methods
let n = 4;
let arr = [10, 20, 30, 40, 0];
let ele = 50;
console.log("Array before insertion");
console.log(arr.slice(0, n).join(" "));
// Inserting element at the end of the array
arr[n] = ele;
console.log("Array after insertion");
console.log(arr.join(" "));
OutputArray before insertion
10 20 30 40
Array after insertion
10 20 30 40 50
Time Complexity: O(1)
Auxiliary Space: O(1)
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