How to Concatenate Two Arrays in C++?
Last Updated : 12 Mar, 2024
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In C++, arrays store a fixed number of elements of the same type in contiguous memory locations. In this article, we will learn how to concatenate two arrays in C++.
Example:
Input:
myArray1={10, 30, 40}
myArray2 ={20, 50, 60}
Output:
Concatenated Array: 10 30 40 20 50 60
Concatenate Two Arrays in One Larger Array in C++
We can concatenate two arrays into one larger array by creating a new array and copying the elements from the original arrays into it by iterating over the elements of the original arrays.
C++ Program to Concatenate Two Arrays
The below program demonstrates how we can concatenate two arrays into a single large array in C++.
C++// C++ program to illustrate how to concatenate two arrays
// into a single one
#include <iostream>
using namespace std;
int main()
{
// Define the input arrays
int arr1[] = { 10, 30, 40 };
int arr2[] = { 20, 50, 60 };
// Determine the size of the arrays
int n1 = sizeof(arr1) / sizeof(arr1[0]);
int n2 = sizeof(arr2) / sizeof(arr2[0]);
// Create a new array to hold the concatenated elements
int arr3[n1 + n2];
// Copy the elements from the first array
for (int i = 0; i < n1; i++)
arr3[i] = arr1[i];
// Copy the elements from the second array
for (int i = 0; i < n2; i++)
arr3[n1 + i] = arr2[i];
// Print the concatenated array
cout << "Concatenated Array: ";
for (int i = 0; i < n1 + n2; i++)
cout << arr3[i] << " ";
cout << endl;
return 0;
}
Output
Concatenated Array: 10 30 40 20 50 60
Time Complexity: O(N+M), here N and M are the lengths of both the arrays.
Auxiliary Space: O(N+M)
