How to Accurately Calculate the Number of Pages for Pagination?

Rounding Integer Division Results for Pagination Controls

When implementing pagination in C# or Java, accurately calculating the number of pages is crucial for displaying the appropriate navigation controls. The goal is to divide the total number of items by the items per page size to determine the page count.

Consider the following scenario: you have 36 items and want to display them in groups of 8 per page. Intuitively, we might expect 4 pages. However, conventional integer division returns 4.5, resulting in an incomplete last page with only 4 items.

To compensate for this, the result of integer division should be rounded up. One elegant solution is to use the formula:

pageCount = (records + recordsPerPage - 1) / recordsPerPage;

According to this formula, with 36 items and 8 items per page, the number of pages becomes:

pageCount = (36 + 8 - 1) / 8 = (43) / 8 = 5

This formula ensures that the result is rounded up, ensuring that all items are displayed and navigation controls accurately reflect the total number of pages.

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