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➜ MUSHclient
➜ Lua
➜ Even/Odd comparison
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Posted by
| tobiassjosten
Sweden (79 posts) Bio
|
Date
| Mon 30 May 2005 10:38 AM (UTC) |
Message
| I can't seem to find a way to check wether a number is odd or even. I've tried with type() (which just gives 'number') and string.find(tostring(number), "."). String.find didn't prove very helpful, despite being my best bet. :/ I tried escaping the dot (is it in regexp format?) but it didn't work either. Anyone got any suggestions as to how I could do this?
The purpose is to get this function to output a centered text:
function visLine(msg, color)
lnum, rnum = (74 - string.len(msg)) / 2, (74 - string.len(msg)) / 2
if not string.find(tostring(lnum), "\.") == false then rnum = lnum + 2 end
ColourTell("lightgrey", "", string.rep("-",lnum) .. " [ ")
ColourTell(color, "", msg)
ColourNote("lightgrey", "", " ] " .. string.rep("-",rnum))
end
|
Simplicity is Divine | http://nogfx.org/ | Top |
|
Posted by
| Larkin
(278 posts) Bio
|
Date
| Reply #1 on Mon 30 May 2005 02:28 PM (UTC) |
Message
| Use the math.mod function to find the remainder of your number from dividing by 2. If the result is 0, it's even. Otherwise, it's odd.
if math.mod(num, 2) == 0 then
print("even")
else
print("odd")
end
| Top |
|
Posted by
| tobiassjosten
Sweden (79 posts) Bio
|
Date
| Reply #2 on Mon 30 May 2005 03:53 PM (UTC) |
Message
| Kind of makes sense to use the math-functions for integers. :P
Thanks alot! |
Simplicity is Divine | http://nogfx.org/ | Top |
|
Posted by
| Nick Gammon
Australia (23,133 posts) Bio
Forum Administrator |
Date
| Reply #3 on Sun 05 Jun 2005 02:42 AM (UTC) |
Message
| Another approach which doesn't use division is to use the "bit" extension in the MUSHclient Lua implementation.
eg.
Strangely I couldn't find these functions documented anywhere on this site. If someone can find the URL please let me know.
In summary, MUSHclient has a "bit" table which implements bitwise operations, for use in cases like this.
bit.shr
Shift right - shift arg1 right by arg2 bits
eg.
print (bit.shr (64, 2)) --> 16
bit.shl
Shift left - shift arg1 left by arg2 bits
eg.
print (bit.shl (64, 2)) --> 256
bit.band
Bitwise and ("and" is a keyword) - takes multiple arguments
eg.
print (bit.band (15, 7, 3)) --> 3
bit.bor
Bitwise or ("or" is keyword) - takes multiple arguments
eg.
print (bit.bor (1, 4, 8)) --> 13
bit.xor
Exclusive or - takes multiple arguments
eg.
print (bit.xor (15, 1)) --> 14
bit.neg
Bitwise negate (ones complement as a 32-bit unsigned number)
eg.
print (bit.neg (15)) --> 4294967280
|
- Nick Gammon
www.gammon.com.au, www.mushclient.com | Top |
|
Posted by
| Ked
Russia (524 posts) Bio
|
Date
| Reply #4 on Sun 05 Jun 2005 06:37 AM (UTC) |
Message
| |
The dates and times for posts above are shown in Universal Co-ordinated Time (UTC).
To show them in your local time you can join the forum, and then set the 'time correction' field in your profile to the number of hours difference between your location and UTC time.
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