how to print reverse for loop from right to left output display

how to print reverse for loop from right to left output display

how to print reverse for loop from right to left below is my forloop which
dispay value like this i want to change output like mirror image value
that show from lrft to right i want to show from right to left see below
31 30 29 28
i want to show like this
28 29 30 31
what will i change in for loop code
int r;
int p;
r=31;
for (i = 0,p=r; i < week_no; i++,p--)
{
HoyahCalendar.a[i / 7][i % 7] = String.valueOf(p);
}