Find Top 3 Largest Values in an Array

#include <stdio.h>
#include <stdint.h>

void sort_desc(uint8_t *arr, uint8_t n) {
     for (uint8_t i = 0; i < n - 1; ++i)
    {
        for (uint8_t j = i + 1; j < n; ++j)
        {
            if(*(arr + i) < *(arr + j))
            {
                *(arr + i) = *(arr + i) + *(arr + j);
                *(arr + j) = *(arr + i)  - *(arr + j);
                *(arr + i) = *(arr + i)  - *(arr + j);
            }
        }
    }
}

void find_top_3(uint8_t *arr, uint8_t n) {
    
    sort_desc(arr, n);
    if(n >= 3)
    {
        printf("%hhu %hhu %hhu", *arr, *(arr + 1), *(arr + 2));
    }
    else 
    {
        for (int i = 0; i < n; ++ i)
        {
            printf("%hhu ", *(arr + i));
        }
    }

}

int main() {
    uint8_t n;
    scanf("%hhu", &n);
    uint8_t arr[100];

    for (uint8_t i = 0; i < n; i++) {
        scanf("%hhu", &arr[i]);
    }

    find_top_3(arr, n);
    return 0;
}