Write a C Program To Reverse an Array Using Function

In this tutorial, we are going to see how to write a C program to reverse an array using function. For example, if ‘arr’ is an array of integers with three elements such as:

arr[0] = 1
arr[1] = 2
arr[2] = 3

Then, by reversing the array we will have:

arr[0] = 3
arr[1] = 2
arr[2] = 1

There are four ways to reverse an array in C, by using for loop, pointers, recursion, or by creating a function.
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Write a C Program To Reverse an Array Using Function

#include <stdio.h>

// function to reverse an Array
void reverse(int arr[10], int n)
{
	int i, tmp;
	for(i=0;i< n/2;i++)
	{
		tmp = arr[i];
		arr[i] = arr[n-1-i];
		arr[n-1-i] = tmp;
	}
}

int main()
{
	int arr[100], i, size;

	printf("Enter size of array: ");
	scanf("%d",&size);

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

	// call reverse function 
	reverse(arr,size);

	// display reversed array 
	printf("After reversing the array: ");
	for(i=0;i < size;i++)
	{
		printf("%d ", arr[i]);
	}
	return 0;
}

Output:

Enter size of array: 3  
Enter the elements of the array: 1 2 3
After reversing the array: 3 2 1

 

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