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Rouding up a number

Dave Mere
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Joined: Oct 25, 2004
Posts: 37
Hi there,

As part of my pagination efforts, I need to round up a number to work out how many pages I need. So, where results is my ArrayList:

This outputs;

So 18 records returned (ok). The divide by 10 . . . = 1.0? What's going on?

How can I round up 18/10? Or generally work out how many pages I need for my 18 record resultset?


Sam Bluesman
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Joined: Nov 21, 2004
Posts: 191

I had that problem

Moosey knows best
Dave Mere
Ranch Hand

Joined: Oct 25, 2004
Posts: 37
Sorted! Cheers Sam.

And on that note, I'm off to the pub . . .
Stan James
(instanceof Sidekick)
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Joined: Jan 29, 2003
Posts: 8791
For some reason I did a bunch of these in the waning days of my COBOL life, and just added divisor-1 before dividing. This linecount and pagecount case came up for a character mode help system. For ints:

pagecount = ( linecount + linesperpage - 1 ) / linesperpage

A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi
It is sorta covered in the JavaRanch Style Guide.
subject: Rouding up a number