int main()
{
    int px[5] = { 5,6,2,4,0};
    int left = 0;
    int right = sizeof(px) / sizeof(px[1]) - 1;
    int right1= sizeof(px) / sizeof(px[1]) - 1;
    while (left != right1)
    {
        
        if (px[left] < px[right])
        {
            int tem;
            tem = px[right];
            px[right] = px[left];
            px[left] = tem;
            right=right-1;
        }
        if (right == left)
        {
            left=left+1;
            right = right1;
        }

    }
    printf("%d%d%d%d%d", px[0], px[1], px[2],px[3],px[4]);
    return 0;

int main()
{
    int px[5] = {5, 6, 2, 4, 0};
    int left = 0;
    int right = sizeof(px) / sizeof(px[1]) - 1;
    int right1 = right; // sizeof(px) / sizeof(px[1]) - 1;

    while (left != right1)
    {
        if (px[left] < px[right])
        {
            int tem;
            tem = px[right];
            px[right] = px[left];
            px[left] = tem;
            // right = right - 1;
        }
        right--;//
        if (right == left)
        {
            left = left + 1;
            right = right1;
        }
    }
    printf("%d %d %d %d %d", px[0], px[1], px[2], px[3], px[4]);
    return 0;
}

感谢大佬