Reverse Array in C Last Updated : 20 Nov, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report Try it on GfG Practice Reversing an array means the swapping last element and first element, second last element and second element, and so on. In this article, we will learn how to reverse an array in C.The simplest method to reverse an array in C program is by using two pointers: one starting at the beginning (left) and one at the end (right) of the string. Swap the elements at these pointers while moving them towards centre of the array until the pointers meet. C #include <stdio.h> void rev(int arr[], int n) { // Two pointers int l = 0, r = n - 1; while (l < r) { // Swap the elements int temp = arr[l]; arr[l] = arr[r]; arr[r] = temp; // Move pointers towards middle l++; r--; } } int main() { int arr[] = {1, 2, 3, 4, 5}; int n = sizeof(arr) / sizeof(arr[0]); // Reverse array arr rev(arr, n); for (int i = 0; i < n; i++) printf("%d ", arr[i]); return 0; } Output5 4 3 2 1 Apart from the above method, an array can also be reversed using the methods shown below:Table of ContentUsing RecursionUsing a Temporary ArrayUsing RecursionThis method is the recursive implementation of two pointer approach but uses recursive call to swap the elements and move the two pointers. C #include <stdio.h> void rev(int arr[], int l, int r) { if (l >= r) { return; } // Swap the elements int temp = arr[l]; arr[l] = arr[r]; arr[r] = temp; // Recursively call function to reverse the // remaining part rev(arr, l + 1, r - 1); } int main() { int arr[] = {1, 2, 3, 4, 5}; int n = sizeof(arr) / sizeof(arr[0]); // Reverse the array arr rev(arr, 0, n - 1); for (int i = 0; i < n; i++) printf("%d ", arr[i]); return 0; } Output5 4 3 2 1 Using Temporary ArrayAnother method is to create a new array to store the reversed elements by copying the array from last to first, then copy the contents back into the original array. C #include <stdio.h> void rev(int arr[], int n) { int temp[n]; // Store elements into temp in reverse order for (int i = 0; i < n; i++) { temp[i] = arr[n - 1 - i]; } // Copy reversed array back to original array for (int i = 0; i < n; i++) { arr[i] = temp[i]; } } int main() { int arr[] = {1, 2, 3, 4, 5}; int n = sizeof(arr) / sizeof(arr[0]); // Reverse the array arr rev(arr, n); for (int i = 0; i < n; i++) printf("%d ", arr[i]); return 0; } Output5 4 3 2 1 Comment More infoAdvertise with us K kartik Follow Improve Article Tags : C Programs C Language c-array C Strings Programs C Array Programs C Examples +2 More Similar Reads C Programming Language Tutorial C is a general-purpose mid-level programming language developed by Dennis M. Ritchie at Bell Laboratories in 1972. It was initially used for the development of UNIX operating system, but it later became popular for a wide range of applications. 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