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:

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C Programming: Tips of the Day
C Programming - What is the argument for printf that formats a long?
Put an l (lowercased letter L) directly before the specifier.
unsigned long n; long m; printf("%lu %ld", n, m);
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