And/fi: what changed
Revision 1 to 2. Removed lines have a minus sign; added lines have a plus sign.
| Old | New | Line | |
|---|---|---|---|
| 1 | + | ## Contents | |
| 2 | + | ||
| 3 | + | * 1 And (ja) boolean lausekkeessa | |
| 4 | + | * 1.1 And eli ja-operaation totuustaulukko | |
| 5 | + | * 2 And eli ja bittikohtaisissa toiminnoissa | |
| 6 | + | * 2.1 Onko kakkosen potenssi | |
| 7 | + | * 2.1.1 Lisätietoa | |
| 8 | + | ||
| 1 | 9 | # And (ja) boolean lausekkeessa | |
| 2 | 10 | ||
| 3 | - | ||
| 11 | + | **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 | 12 | ||
| 5 | 13 | ## And eli ja-operaation totuustaulukko | |
| 6 | 14 | ||
| 7 | - | ||
| 8 | - | ||
| 9 | - | ||
| 10 | - | ||
| 11 | - | ||
| 12 | - | ||
| 13 | - | ||
| 15 | + | A | B | A and B (eli A ja B) | |
| 16 | + | ---|---|--- | |
| 17 | + | false | false | false | |
| 18 | + | false | true | false | |
| 19 | + | true | false | false | |
| 20 | + | true | true | true | |
| 21 | + | ||
| 14 | 22 | # And eli ja bittikohtaisissa toiminnoissa | |
| 15 | 23 | ||
| 16 | - | ||
| 24 | + | Bitettäin tehtävä and (ja) asettaa kyseisen bitin ykköseksi (1) jos molemmat vastaavat bitit ovat ykkösiä (1). Muussa tapauksessa tulos on nolla (0). | |
| 17 | 25 | ||
| 18 | 26 | ## Onko kakkosen potenssi | |
| 19 | - | ||
| 20 | - | ||
| 27 | + | ``` | |
| 21 | 28 | function IsPowerOfTwo( const aValue : longint ): boolean; | |
| 22 | - | ||
| 23 | - | ||
| 24 | - | ||
| 25 | - | ||
| 26 | - | ||
| 27 | - | ||
| 29 | + | var | |
| 30 | + | x : longint; | |
| 31 | + | b : boolean; | |
| 28 | 32 | begin | |
| 29 | - | ||
| 30 | - | ||
| 31 | - | ||
| 33 | + | b := false; | |
| 34 | + | if aValue <> 0 then | |
| 35 | + | begin | |
| 36 | + | x := aValue - 1; | |
| 37 | + | x := x and aValue; | |
| 38 | + | if x = 0 then b := true; | |
| 39 | + | end; | |
| 40 | + | result := b; | |
| 32 | 41 | end; | |
| 33 | - | ||
| 34 | - | ||
| 35 | 42 | ``` | |
| 36 | 43 | ||
| 37 | - | ||
| 44 | + | Jos kutsutaan IsPowerOfTwo(4) niin saadaan true. Jos kutsutaan IsPowerOfTwo(5) niin saadaan false . | |
| 38 | 45 | ||
| 39 | 46 | ### Lisätietoa | |
| 40 | 47 | ||
| 41 | - | ||
| 42 | - | ||
| 48 | + | * [[Not]] | |
| 49 | + | * [[Shl]] | |
| 43 | 50 | ||
| 44 | - | ||
| 45 | - | ||
| 46 | - | ||
| 51 | + | * [[Const/fi|Const]] | |
| 52 | + | * [[Function]] | |
| 53 | + | * [[Integer/fi|Integer]] | |
| 47 | 54 | ||
| 48 | - | ||
| 55 | + | * [[Shl|Clear a bit]] | |
| 49 | 56 | ||
| 50 | 57 | --- | |
| 51 | - | ||
| 52 | - | ||
| 58 | + | *From the Free Pascal wiki, page "And/fi", as the Internet Archive kept it on 2022-09-25. 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).* |