C program to reverse an array in place using pointers

In this article we will learn to implement a C program to reverse an array in place using pointers. A C program is provided below to reverse the given array in place using pointers.

Program is as follows:

#include<stdio.h>
void reversearray(int *p, int n)
{
	int *first = p;
	int *last = p+n-1;
	while(first<last)
	{
		int temp = *first;
		*first = *last;
		*last = temp;
		first++;
		last--;
	}
	printf("Reversed array elements are: ");
	for(int i=0; i<n; i++)
		printf("%d ", *p++);
}
int main()
{
	int n;
	printf("Enter n: ");
	scanf("%d", &n);
	int a[n];
	printf("Enter %d numbers: ");
	for(int i=0; i<n; i++)
		scanf("%d", &a[i]);
	reversearray(a, n);
	return 0;
}

Input and output for the above program is as follows:

Enter n: 5
Enter 5 numbers: 6 7 1 3 8
Reversed array elements are: 8 3 1 7 6

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.