And/fi: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: And/fi
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| 1 | + | # And (ja) boolean lausekkeessa | |
| 2 | + | ||
| 3 | + | **And** eli **ja** -operaatio antaa [[True|true]] eli tosi arvon vain silloin kun molemmat operandit ovat tosia (true). Muissa tapauksissa tuloksena on epätosi eli [[False|false]]. | |
| 4 | + | ||
| 5 | + | ## And eli ja-operaation totuustaulukko | |
| 6 | + | ||
| 7 | + | | A | B | A and B (eli A ja B) | | |
| 8 | + | |:---------:|:---------:|--------------------------| | |
| 9 | + | | false | false | false | | |
| 10 | + | | false | true | false | | |
| 11 | + | | true | false | false | | |
| 12 | + | | true | true | true | | |
| 13 | + | ||
| 14 | + | # And eli ja bittikohtaisissa toiminnoissa | |
| 15 | + | ||
| 16 | + | Bitettäin tehtävä and (ja) asettaa kyseisen bitin ykköseksi (1) jos molemmat vastaavat bitit ovat ykkösiä (1). Muussa tapauksessa tulos on nolla (0). | |
| 17 | + | ||
| 18 | + | ## Onko kakkosen potenssi | |
| 19 | + | ||
| 20 | + | ``` pascal | |
| 21 | + | function IsPowerOfTwo( const aValue : longint ): boolean; | |
| 22 | + | var | |
| 23 | + | x : longint; | |
| 24 | + | b : boolean; | |
| 25 | + | begin | |
| 26 | + | b := false; | |
| 27 | + | if aValue <> 0 then | |
| 28 | + | begin | |
| 29 | + | x := aValue - 1; | |
| 30 | + | x := x and aValue; | |
| 31 | + | if x = 0 then b := true; | |
| 32 | + | end; | |
| 33 | + | result := b; | |
| 34 | + | end; | |
| 35 | + | ``` | |
| 36 | + | ||
| 37 | + | Jos kutsutaan IsPowerOfTwo(4) niin saadaan true. Jos kutsutaan IsPowerOfTwo(5) niin saadaan false . | |
| 38 | + | ||
| 39 | + | ### Lisätietoa | |
| 40 | + | ||
| 41 | + | - [[Not]] | |
| 42 | + | - [[Shl]] | |
| 43 | + | ||
| 44 | + | - [[Const/fi|Const]] | |
| 45 | + | - [[Function]] | |
| 46 | + | - [[Integer/fi|Integer]] | |
| 47 | + | ||
| 48 | + | - [[Shl|Clear a bit]] | |
| 49 | + | ||
| 50 | + | --- | |
| 51 | + | *From the Free Pascal wiki, page "And/fi", as it stood on 2020-01-26 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).* | |
| 52 | + | Category: Suomi |