In: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: In
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| 1 | + | The [[Reserved word|reserved word]] `in`: | |
| 2 | + | ||
| 3 | + | - It tests whether a value is in a [[Set|set]]. It returns the [[Boolean|boolean]] value \[\[True\| | |
| 4 | + | ||
| 5 | + | `true`\]\] if the value belongs to the set and [[False|false]] if the value does not belong to the set. | |
| 6 | + | ||
| 7 | + | - It is also used with the reserved word [[For|for]] in [[for-in loop]]. | |
| 8 | + | - It is also usable in [[Uses|uses‑clauses]]. | |
| 9 | + | ||
| 10 | + | ## Example \#1 | |
| 11 | + | ||
| 12 | + | ``` pascal | |
| 13 | + | program projectin; | |
| 14 | + | uses SysUtils, TypInfo; | |
| 15 | + | type | |
| 16 | + | Berry = (Blueberry, FlyHoneysuckle, Lingonberry, Raspberry, Snowberry, Strawberry); | |
| 17 | + | Berries = set of berry; | |
| 18 | + | var | |
| 19 | + | basket: Berries; | |
| 20 | + | someberry: berry; | |
| 21 | + | str: string; | |
| 22 | + | i: integer; | |
| 23 | + | begin | |
| 24 | + | basket := []; | |
| 25 | + | writeLn('Choose a berry from the following berries into your basket'); | |
| 26 | + | repeat | |
| 27 | + | i := 1; | |
| 28 | + | for someberry in berry do | |
| 29 | + | begin | |
| 30 | + | Str := GetEnumName(TypeInfo(Berry),ord(someberry)); | |
| 31 | + | writeln(i,' : ',Str); | |
| 32 | + | inc(i); | |
| 33 | + | end; | |
| 34 | + | writeln('0 : exit'); | |
| 35 | + | writeln; | |
| 36 | + | readln(i); | |
| 37 | + | if i>0 then | |
| 38 | + | begin | |
| 39 | + | someberry :=Berry(i-1); | |
| 40 | + | Include(basket, someberry); | |
| 41 | + | end; | |
| 42 | + | until i=0; | |
| 43 | + | if (FlyHoneysuckle in basket) or (Snowberry in basket) then | |
| 44 | + | begin | |
| 45 | + | writeln('You have poisonous berries in your basket'); | |
| 46 | + | if FlyHoneysuckle in basket then | |
| 47 | + | writeln('Your basket has a poisonous Fly honeysuckle!') ; | |
| 48 | + | if Snowberry in basket then | |
| 49 | + | writeln('Your basket has a poisonous Snowberry!'); | |
| 50 | + | end; | |
| 51 | + | writeln('So you had these berries in your basket:'); | |
| 52 | + | for someberry in basket do | |
| 53 | + | begin | |
| 54 | + | Str := GetEnumName(TypeInfo(Berry), Ord(someberry)); | |
| 55 | + | writeln(Str); | |
| 56 | + | end; | |
| 57 | + | readln; | |
| 58 | + | end. | |
| 59 | + | ``` | |
| 60 | + | ||
| 61 | + | ## Example \#2 | |
| 62 | + | ||
| 63 | + | ``` pascal | |
| 64 | + | const Test: char = 'q'; | |
| 65 | + | ||
| 66 | + | begin | |
| 67 | + | if (Test in ['0'..'9']) then | |
| 68 | + | Writeln('Digit') | |
| 69 | + | else if (Test in ['A'..'z']) then | |
| 70 | + | Writeln('Letter') | |
| 71 | + | else | |
| 72 | + | Writeln('Other'); | |
| 73 | + | end. | |
| 74 | + | ``` | |
| 75 | + | ||
| 76 | + | --- | |
| 77 | + | *From the Free Pascal wiki, page "In", as it stood on 2022-05-26 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).* |