Is there a Ceiling function?

Archived
1

Most languages have a ceiling function. That is to say a function that takes a number and rounds it up to the next largest integer

Gives results like this:
1.1 → 2
1.5 → 2
1.9 → 2
2.0 → 2
2.1 → 3

I don’t see it in the list of the Built-in functions (http://sdkdocs.roku.com/display/sdkdoc4 … -functions). Does Brightscript not have this basic method?

2

No but you can easily do something like


 if Int(x) = x then ceiling = x else ceiling = Int(x) + 1

–Mark

3

“greengiant83” wrote:
Most languages have a ceiling function. … Does Brightscript not have this basic method?

That’s not true. Most languages have “floor” and “round” kind of conversion float->int. And the reason “ceiling” might not be included is you can easily do that with floor(x + 1 - epsilon), where epsilon is some platform specific small value like 1e-30. Or you know, floor(x + 0.9999…). Duh.

4

Most - can’t be used as an adjective in this thread. The only language I know of with a ceiling function is javascript. Spreadsheets have the function as well, but those aren’t programming languages.
Int and Fix are already filling the requirement, so there isn’t a real need for a ceiling specific function in brightscript.

5

“The only language I know of with a ceiling function is javascript.”

I guess you haven’t used any of the top ten programming languages then: http://bestteneverything.com/top-ten-mo … ages-2013/

They all have a ceil/ceiling function.

Anyway, would it make sense to do something like “-(Int(-x))” instead of the other solutions?

6

Yup, guess not. Anyway, you could show off by creating your own ceiling function in Brightscript - impress your friends.

7

There is: just use Int(variable as float)

http://sdkdocs.roku.com/pages/viewpage. … tAsInteger

8

“damon1337” wrote:
There is: just use Int(variable as float)
No. What int() does is actually floor():

BrightScript Debugger> ? int(1.4), int(-1.4)
 1     -2

The right way to do it is what RokuMarkn said. Slightly optimized:

function ceiling(x):
  i = int(x)
  if i < x then i = i + 1
  return i
end function

Or a one-liner for the console:

BrightScript Debugger> ceiling = function(x): return int(x) + sgn(x - int(x)): end function
BrightScript Debugger> ? ceiling(1.4), ceiling(-1.4)
 2            -1