Reverse of an Array in C

March 20, 2025

Reverse of an array in C Programming Language

On this page, we will look into a coding question where we will learn how to reverse the array in C Programming Language. There might be different approaches to solve this question, one you will find here. If your approach is a bit different post it in the comment section.

introduction to arrays in V

Reverse of an Array In C

In C programming language, an array is a collection of elements of the same type stored in contiguous memory locations. To reverse an array in C, you need to swap the elements of the array in a specific order.

One way to reverse an array is to use two pointers, one pointing to the first element of the array and the other pointing to the last element of the array. Then, swap the elements at the two pointers and move the pointers towards each other until they meet at the middle of the array.

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Algorithm:

  1. Initialize two pointers start_ptr and end_ptr to the first and last elements of the array, respectively.
  2. While start_ptr is less than end_ptr, do the following:
    1. Swap the elements pointed to by start_ptr and end_ptr.
    2. Increment start_ptr by 1.
    3. Decrement end_ptr by 1.
  3. When the loop terminates, the array will be reversed.

Program for reversing an array in C

Run

#include<stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    int arr[n];
    int temp;
    for(int i=0; i<n; i++)
    {
        scanf("%d",&arr[i]);
    }
    for(int i=0; i<n/2; i++)
    {
        temp = arr[i];
        arr[i] = arr[n-i-1];
        arr[n-1-i] = temp;
    }
    for(int i=0; i<n; i++)
    {
        printf("%d ",arr[i]);   
    }
    return 0;
}

Output:

5
2 5 1 4 3
3 4 1 5 2