C++ Exercises: Create a new array swapping the first and last elements of a given array of integers and length will be least 1

Last update on August 13 2025 12:46:37 (UTC/GMT +8 hours)

Swap First and Last Elements of Array

Write a C++ program to create an array by swapping the first and last elements of a given array of integers with a length of at least 1.

Sample Solution:

C++ Code :

#include <iostream>  // Including input-output stream header file

using namespace std;  // Using standard namespace

static int *test(int numbers[], int arr_length)  // Function definition that swaps the first and last elements of an array
{
    int first = numbers[0];  // Storing the first element of the array
    numbers[0] = numbers[arr_length - 1];  // Swapping the first element with the last element of the array
    numbers[arr_length - 1] = first;  // Assigning the stored first element to the last position

    return numbers;  // Returning a pointer to the modified array
}

int main () {
   int *p, i;  // Declaring pointer variable p and integer i
   int nums1[] = { 1, 5, 7, 9, 11, 13 };  // Initializing array nums1 with values
   cout << "Original array:" << endl;   	
   int arr_length = sizeof(nums1) / sizeof(nums1[0]);  // Calculating length of array nums1

   for ( i = 0; i < arr_length; i++ ) {  // Loop to print elements of the nums1 array
      cout << nums1[i] << " ";  // Printing elements of the nums1 array
   } 

   p =  test(nums1, arr_length);  // Calling the test function and storing the returned pointer in p

   cout << "\nNew array (after swapping the first and last elements of the said array): " << endl;   // Printing a message

   for ( i = 0; i < arr_length; i++ ) {  // Loop to print elements of the array pointed by p
      cout << *(p + i) << " ";  // Printing elements of the array pointed by p
   } 

   return 0;  // Returning 0 to indicate successful completion of the program
}

Sample Output:

Original array:
1 5 7 9 11 13
New array (after swapping the first and last elements of the said array):
13 5 7 9 11 1

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to swap the first and last elements of an integer array of any length and print the modified array.
• Write a C++ program that reads an array and interchanges its first and last items, then outputs the resulting array.
• Write a C++ program to create a new array by exchanging the first and last elements of a given array, keeping all other elements unchanged.
• Write a C++ program that processes an input array and swaps its boundary elements, printing the new configuration.

Go to:

• C++ Basic Algorithm Exercises Home ↩
• C++ programming Exercises Home ↩

PREV : Create Array from Middle Elements of Even-Length Array.
NEXT : Create Array of Middle 3 Elements (Length ≥ 3).

C++ Code Editor:

Click to Open Editor

Contribute your code and comments through Disqus.