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Write a C program to print all unique element in an array

robaa
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2022-11-24
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Write a C program to print all unique element in an array. Here’s simple program to print all unique element in an array in C Programming Language.

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robaa
2022-11-24
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What is an Array ?

Arrays a kind of data structure that can store a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.

 
 

Instead of declaring individual variables, such as number0, number1, …, and number99, you declare one array variable such as numbers and use numbers[0], numbers[1], and …, numbers[99] to represent individual variables. A specific element in an array is accessed by an index.

All arrays consist of contiguous memory locations. The lowest address corresponds to the first element and the highest address to the last element.

Here is source code of the C program to print all unique element in an array. The C program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

 

SOURCE CODE : :

/*  C program to print all unique element in an array  */

#include <stdio.h>

int main()
{
    int arr[100], size, isUnique;
    int i, j, k; //Used for loops

    /*
     * Reads size of the array
     */
    printf("Enter size of array: ");
    scanf("%d", &size);

    /*
     * Reads elements in array
     */
    printf("\nEnter %d elements in array :: \n",size);
    for(i=0; i<size; i++)
    {
        printf("\nEnter %d element in array :: ",i+1);
        scanf("%d", &arr[i]);
    }

    /*
     * Removes all duplicate elements from array
     */
    for(i=0; i<size; i++)
    {
        /* Assumes that the current array element is unique */
        isUnique = 1;

        for(j=i+1; j<size; j++)
        {
            /*
             * If any duplicate element is found
             */
            if(arr[i]==arr[j])
            {
                /* Remove the duplicate element */
                for(k=j; k<size-1; k++)
                {
                    arr[k] = arr[k+1];
                }

                size--;
                j--;
                isUnique = 0;
            }
        }

        /*
         * If array element is not unique
         * then also remove the current element
         */
        if(isUnique != 1)
        {
            for(j=i; j<size-1; j++)
            {
                arr[j] = arr[j+1];
            }

            size--;
            i--;
        }
    }

    /*
     * Prints all unique elements in array
     */
    printf("\nAll unique elements in the array are :: ");
    for(i=0; i<size; i++)
    {
        printf(" %d ", arr[i]);
    }

    return 0;
}

OUTPUT : :

Enter size of array: 7

Enter 7 elements in array ::

Enter 1 element in array :: 1

Enter 2 element in array :: 2

Enter 3 element in array :: 3

Enter 4 element in array :: 4

Enter 5 element in array :: 3

Enter 6 element in array :: 2

Enter 7 element in array :: 5

All unique elements in the array are ::  1  4  5

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