are_all_array_elements_different.c

/*

    are_all_array_elements_different.c

    Are all the elements of the array different from each other.
    Check if all array elements are distinct (unique).


    You can find all my C programs at Dragan Milicev's pastebin:

    https://pastebin.com/u/dmilicev

*/

#include <stdio.h>

void ShowArray( char text[], int array[], int n )
{
    int i;

    printf("%s", text);

    for(i=0;i<n;i++)
        printf("%2d", array[i]);

    printf("\n");
}

// returns 1 if all elements are distinct (unique, different from each other)
// otherwise returns 0
int all_array_elements_are_distinct( int arr[], int size )
{
    int i, j;

    for (i=0; i<size; i++)
        for (j=i+1; j<size; j++)
            if (arr[i] == arr[j])
                return 0;

    return 1;
}


int main(void)
{
    int arr1[10] = {2,5,3,7,4,8,1,0,9,6};
    int arr2[10] = {2,5,3,7,5,8,1,0,9,6};
    int n1 = sizeof(arr1) / sizeof(arr1[0]);    // or n1 = sizeof(arr1) / sizeof(int);
    int n2 = sizeof(arr2) / sizeof(arr2[0]);    // or n2 = sizeof(arr2) / sizeof(int);

    ShowArray("\n Array arr1[] is: ",arr1,n1);

    if ( all_array_elements_are_distinct(arr1,n1) )
        printf("\n All array elements are distinct (unique, different from each other). \n");
    else
        printf("\n There are repeating elements in the array. \n");

    ShowArray("\n Array arr2[] is: ",arr2,n2);

    if ( all_array_elements_are_distinct(arr2,n2) )
        printf("\n All array elements are distinct (unique, different from each other). \n");
    else
        printf("\n There are repeating elements in the array. \n");

    return 0;

} // main()