C bubble sorting

    #include <stdio.h>
    void main()
    {

        int i, j, a, n, number[30];
        printf("Ile licz chcesz wprowadzic \n");
        scanf("%d", &n);

        printf("wprowadz liczby \n");
        for (i = 0; i < n; ++i)
            scanf("%d", &number[i]);

        for (i = 0; i < n; ++i)
        {

            for (j = i + 1; j < n; ++j)
            {

                if (number[i] > number[j])
                {
                    a =  number[i];
                    number[i] = number[j];
                    number[j] = a;

                }

            }

        }

        printf("Liczby posortowano \n");
        for (i = 0; i < n; ++i)
            printf("%d\n", number[i]);

    }