Luhn algorithm/fr: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: Luhn algorithm/fr
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| 1 | + | Cet algorithme a été créé par Hans Peter Luhn. Il est spécifié dans la norme [ISO/IEC 7812-1](https://en.wikipedia.org/wiki/ISO/IEC_7812) et est utilisé par certaines cartes de crédit par exemple. | |
| 2 | + | ||
| 3 | + | ``` pascal | |
| 4 | + | function LuhnAlgorithmCheckDigit(const s:string):integer; | |
| 5 | + | var | |
| 6 | + | l, i, sum, deo : integer; | |
| 7 | + | begin | |
| 8 | + | l := length( s ); | |
| 9 | + | sum := 0; | |
| 10 | + | for i := l downto 1 do | |
| 11 | + | begin | |
| 12 | + | if odd(i) then sum := sum + StrToInt(s[i]) | |
| 13 | + | else | |
| 14 | + | begin | |
| 15 | + | deo := StrToInt(s[i]) * 2 ; | |
| 16 | + | if deo > 9 then deo := deo mod 10 + 1; | |
| 17 | + | sum := sum + deo; | |
| 18 | + | end; | |
| 19 | + | end; | |
| 20 | + | result := 10 - sum mod 10; | |
| 21 | + | end; | |
| 22 | + | ||
| 23 | + | function isLuhnValid( const s : string ): boolean; | |
| 24 | + | var | |
| 25 | + | i, l :integer; | |
| 26 | + | begin | |
| 27 | + | l := length( s ); | |
| 28 | + | i := LuhnAlgorithmCheckDigit( copy( s, 1, l-1) ); | |
| 29 | + | result := i = StrToInt( s[ l ] ); | |
| 30 | + | end; | |
| 31 | + | ``` | |
| 32 | + | ||
| 33 | + | --- | |
| 34 | + | *From the Free Pascal wiki, page "Luhn algorithm/fr", as it stood on 2020-02-19 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).* |