C program to compare two arrays using pointers

In this article we will learn to implement a C program to compare two arrays using pointers. A C program is provided below for reading two arrays and comparing them using pointers.

Program is as follows:

/*
 * C program to compare two arrays using pointers
 * Author: P.S.SuryaTeja
*/
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <stdlib.h>

void compare(int *a1, int *a2, int n)
{
	int i, flag = 0;
	for(i = 0; i < n; i++)
	{
		if(*a1 != *a2)
		{
			flag = 1;
			break;
		}
		a1++;
		a2++;
	}
	if(flag == 1)
		printf("\nBoth arrays are not equal");
	else
		printf("\nBoth arrays are equal");
}

int main(int argc, char **argv)
{
	int a1[10], a2[10];
	int n, i;
	printf("Enter a number between 1 and 10: ");
	scanf("%d", &n);
	printf("Enter %d numbers for array 1: ", n);
	for(i = 0; i < n; i++)
		scanf("%d", &a1[i]);
	printf("Enter %d numbers for array 2: ", n);
	for(i = 0; i < n; i++)
		scanf("%d", &a2[i]);
	compare(a1, a2, n);
    getch();
    return 0;
}

Input and output for the above program is as follows:

Enter a number between 1 and 10: 5
Enter 5 numbers for array 1: 1 4 5 2 3
Enter 5 numbers for array 2: 2 3 1 4 5

Both arrays are not equal

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.