C Exercises: Print all unique elements of an unsorted array

Last update on March 18 2025 13:21:07 (UTC/GMT +8 hours)

73. Print All Unique Elements (Unsorted Array)

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

Expected Output:
The given array is : 1 5 8 5 7 3 2 4 1 6 2
Unique Elements in the given array are:
1 5 8 7 3 2 4 6

The problem requires writing a C program to identify and print all unique elements from an unsorted array. The program should efficiently determine which elements appear only once in the array and then display these unique elements in the order of their first occurrence.

Sample Solution:

C Code:

#include <stdio.h>
	
int main() {
    int arr1[] = {1, 5, 8, 5, 7, 3, 2, 4, 1, 6, 2};
    int n = sizeof(arr1) / sizeof(int);
    int i, j;

    // Print the original array
    printf("The given array is :  ");
    for (i = 0; i < n; i++) {
        printf("%d  ", arr1[i]);
    }
    printf("\n");

    printf("Unique Elements in the given array are: \n");
    for (i = 0; i < n; i++) {
        // Iterate through the array to find unique elements
        for (j = 0; j < i; j++) {
            // If a duplicate is found, break the loop
            if (arr1[i] == arr1[j])
                break;
        }

        // If 'i' reaches 'j', the current element is unique, hence print it
        if (i == j) {
            printf("%d ", arr1[i]);
        }
    }

    return 0;
}

Output:

The given array is :  1  5  8  5  7  3  2  4  1  6  2  
Unique Elements in the given array are: 
1 5 8 7 3 2 4 6

Flowchart:/p> Flowchart: print all unique elements of an unsorted array.

For more Practice: Solve these Related Problems:

Write a C program to print unique elements from an unsorted array using a frequency counter.
Write a C program to display unique elements by first sorting the array and then eliminating duplicates.
Write a C program to identify unique elements using nested loops without extra memory allocation.
Write a C program to print unique elements and then output them in ascending order.

C Programming Code Editor:

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