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danm
Intermediate
Joined: 29 Jun 2004
Posts: 170
Topics: 73
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 Posted: Wed Apr 23, 2008 8:48 am Post subject: Ceiling and Floor function |
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I can't find a ceiling or floor buildin function in REXX.
| Code: |
Example:
data = 1.00000...1 to 2 Ceiling returns 2
data = 1 to 1.9999.... Floor returns 1
I can create the ceiling and floor function with 3 buildin functions:
format(data + word('.5 0',1+datatype(data,'W')),,0) <-- Ceiling
format(data + word('-.5 0',1+datatype(data,'W')),,0) <-- Floor
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Anyone has a more efficient solution? |
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semigeezer
Supermod
Joined: 03 Jan 2003
Posts: 1014
Topics: 13
Location: Atlantis
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| Posted: Wed Apr 23, 2008 11:42 am Post subject: |
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I forget how negative #s should be treated, but I think this will do it:
| Code: | parse arg a
say floor(a)
say ceil(a)
return
floor: return arg(1)%1-(sign(arg(1)//1)=-1)
ceil: return -floor(-a) |
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kolusu
Site Admin
Joined: 26 Nov 2002
Posts: 12378
Topics: 75
Location: San Jose
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| Posted: Wed Apr 23, 2008 2:40 pm Post subject: |
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danm,
you can try this
| Code: |
FLOOR: procedure
parse arg F
return TRUNC(F) - (F < 0) * (F <> TRUNC(F))
CEILING: procedure
parse arg C
return TRUNC(C) + (C > 0) * (C <> TRUNC(C))
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Kolusu
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warp5
Intermediate
Joined: 02 Dec 2002
Posts: 429
Topics: 18
Location: Germany
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| Posted: Thu Apr 24, 2008 1:24 am Post subject: |
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| Are you talking about the max and min functions of rexx? |
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danm
Intermediate
Joined: 29 Jun 2004
Posts: 170
Topics: 73
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| Posted: Fri Apr 25, 2008 11:20 am Post subject: |
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warp5,
No, I am not talking max or min function. I want to round up or round down to the nearest integer after a calculation. Example: If the calculated value is 2.5, ceiling returns 3, floor returns 2. |
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warp5
Intermediate
Joined: 02 Dec 2002
Posts: 429
Topics: 18
Location: Germany
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| Posted: Mon Apr 28, 2008 1:02 am Post subject: |
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| Well, you could easily create such a function by adding or subtracting 0.5 and then truncating the decimal. |
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