Count how many pages are needed

Question

How do I count how many pages my data needs to fit?

I got 23 rows of data and every page takes 20 rows = 2pages.

When I divide it, I get 1:

var pages = totalRows / 20;

When I use modulus, I get 3:

var pages = totalRows % 20;

So please explain to me what calculation I should use to resolve this issue.

Answer 1

您应该先划分然后四舍五入，这将占最终页面少于20行的原因。

var pages = (int)Math.Ceiling(totalRows / 20.0);

Answer 2

Try

var pages = (totalRows+19) / 20;

in general:

var pages = (totalRows+rowsPerPage-1) / rowsPerPage;

that is equivalent to doing a floating point division and rounding up (see other answer)

Answer 3

I like cdhowie's answer. But if you don't want to use Math.Ceiling you can do the following:

int pages = totalRows / 20;
if (totalRows % 20 != 0) { pages += 1; }