C program to reverse an array in place

In this article we will learn to implement a C program to reverse an array in place (without using a temporary array. A C program is provided below to reverse an array in place.

Program is as follows:

#include<stdio.h>
int main()
{
	int array[20];
	int n;
	printf("Enter number of elements: ");
	scanf("%d", &n);
	printf("Enter array elements: ");
	for(int i = 0; i < n; i++)
		scanf("%d", &array[i]);
	for(int i=0, j=n-1; i < j; i++, j--)
	{
		int temp = array[i];
		array[i] = array[j];
		array[j] = temp;
	}
	printf("Reversed array elements are: ");
	for(int i = 0; i < n; i++)
		printf("%d ", array[i]);
	return 0;
}

Input and output for the above program is as follows:

Enter number of elements: 5
Enter array elements: 12 78 24 13 6
Reversed array elements are: 6 13 24 78 12

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.