In this post, we will learn how to find the unique elements in an array, such that the repetitive elements in the array will be displayed only once.

Let's write a C program to find unique elements in an array.

C Program to Find Unique Elements in an Array

Let's create a file named uniqueelements.c and add the following source code to it.

#include<stdio.h> #define max 100 int ifexists(int z[], int u, int v) {	int i;	for (i=0; i<u;i++)	if (z[i]==v) return (1);	return (0); } void main() {	int p[max], q[max];	int m;	int i,k;	k=0;	printf("Enter length of the array:");	scanf("%d",&m);	printf("Enter %d elements of th array\n",m);	for(i=0;i<m;i++ )	scanf("%d",&p[i]);	q[0]=p[0];	k=1;	for (i=1;i<m;i++)	{	if(!ifexists(q,k,p[i]))	{	q[k]=p[i];	k++;	}	}	printf("\nThe unique elements in the array are:\n");	for(i = 0;i<k;i++)	printf("%d\n",q[i]); } 

To compile and run the above C program, you can use C Programs Compiler Online tool.

Output:

Enter the length of the array:5 Enter 5 elements in the array 1 2 3 2 1 The unique elements in the array are: 1 2 3