C Exercises: Print all unique elements of an array

C Array: Exercise-6 with Solution

Write a program in C to print all unique elements in an array.

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>
int main()
{
    int arr1[100], n,ctr=0;
    int i, j, k;
       printf("\n\nPrint all unique elements of an array:\n");
       printf("------------------------------------------\n");	
       printf("Input the number of elements to be stored in the array: ");
       scanf("%d",&n);
       printf("Input %d elements in the array :\n",n);
       for(i=0;i<n;i++)
            {
	      printf("element - %d : ",i);
	      scanf("%d",&arr1[i]);
	    }
    printf("\nThe unique elements found in the array are: \n");
    for(i=0; i<n; i++)
    {
        ctr=0;
        for(j=0,k=n; j<k+1; j++)
        {
            /*Increment the counter when the seaarch value is duplicate.*/
            if (i!=j)
            {
		       if(arr1[i]==arr1[j])
              {
                 ctr++;
               }
             }
        }
       if(ctr==0)
        {
          printf("%d ",arr1[i]);
        }
    }
       printf("\n\n");
}

Sample Output:

Print all unique elements of an array:
------------------------------------------
Input the number of elements to be stored in the array: 4
Input 4 elements in the array :
element - 0 : 3
element - 1 : 2
element - 2 : 2
element - 3 : 5

The unique elements found in the array are:
3 5

Flowchart:

C Programming Code Editor:

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