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Program to Reverse the Array Elements in C

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In this tutorial, we will learn C Program to Reverse an Array element. Before continuing, you should have knowledge of the following topics in C programming.

Revering an array element: The entered array of integers will be reversed and displayed. Example:

Input:
arr = {1, 2, 3, 4, 5, 6}

Output:
Reversed arr: {6, 5, 4, 3, 2, 1}

Here, we will look at two different programs to Reverse an Array element in C.

  1. By standard method
  2. By creating a function and swapping.

C Program to print the elements of an array in reverse order

#include <stdio.h>

int main()
{
   //Initialize array     
   int arr[50], size, i;

   printf("Enter the size for an array: ");
      scanf("%d", &size);

   printf("Enter %d elements of an array:\n", size);
   for (i = 0; i < size; i++)
      scanf("%d", &arr[i]);

   printf("Original order of an Array:\n");
   for (i = 0; i < size; i++)
   {
      printf("%d ", arr[i]);
   }

   printf("\nReversed order of an array:\n");
   for (i = size - 1; i >= 0; i--)
   {
      printf("%d ", arr[i]);
   }

   return 0;
}

Output:

Enter the size for an array: 5
Enter 5 elements of an array:
10
20
30
40
50
Original order of an Array:
10 20 30 40 50
Reversed order of an array:
50 40 30 20 10

C Program to to Reverse the Array Elements using Function

This program has a separate function(rev_Array()) to reverse the element in an array. The reversing of elements is done by swapping array elements.

#include <stdio.h>

void rev_Array(int arr[], int size)
{
   int temp, i = 0;

   //swapping
   while (i < size)
   {
      temp = arr[i];
      arr[i] = arr[size];
      arr[size] = temp;
      i++;
      size--;
   }
}

int main()
{
   //Variables     
   int arr[50], size, i;

   //user inputs
   printf("Enter the size for an array: ");
      scanf("%d", &size);
   printf("Enter %d elements of an array:\n", size);
   for (i = 0; i < size; i++)
      scanf("%d", &arr[i]);

   printf("Original order of an Array:\n");
   for (i = 0; i < size; i++)
      printf("%d ", arr[i]);

   //calling reverse function
   rev_Array(arr, size - 1);

   //printing the reversed order
   printf("\nReversed order of an Array:\n");
   for (i = 0; i < size; i++)
      printf("%d ", arr[i]);

   return 0;
}

Output:

Enter the size for an array: 5
Enter 5 elements of an array:
20
30
40
60
80
Original order of an Array:
20 30 40 60 80
Reversed order of an Array:
80 60 40 30 20

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