C validating a credit card number Malaysian mature chat


15-Sep-2016 20:54

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] [ 10 /mod swapd suffix swap ] while drop ; : luhn-digit ( n -- n ) reversed-digits dup length iota [ 2dup swap nth swap odd?

Val next dim check as integer = ( sum * 9 ) mod 10 return str( check )End Function Public Function Validate Mod10(digits As String) as Boolean dim check Digit as string = digits.

There are lots of pieces of information we can validate and they will vary by application.

So we're going to stick to the basics and cover the important ones: credit card number, expiration date, and CVV numbers.

Check Digit Scheme can be used when an end-user has entered in a credit card number and you want to validate it before sending it an authorization.

This self-checking scheme (referred to as the Luhn Mod-10 Method) is an international standard for validating card account numbers (ISO 2894/ANSI 4.13). #define ORDER_PP_DEF_8luhn_wk ORDER_PP_FN( fn(8N, \ 8lets((8P, 8unzip(8N, 8nil, 8nil, 8true)) \ (8O, 8seq_fold(8plus, 0, 8tuple_at_0(8P))) \ (8E, 8seq_fold(8plus, 0, \ 8seq_map(8dig_map, 8tuple_at_1(8P)))), \ 8is_0(8remainder(8plus(8O, 8E), 10)))) )#define ORDER_PP_DEF_8unzip ORDER_PP_FN( fn(8S, 8L, 8R, 8O, \ 8if(8is_nil(8S), \ 8pair(8L, 8R), \ 8if(8O, \ 8unzip(8seq_tail(8S), 8seq_push_back(8seq_head(8S), 8L), \ 8R, 8false), \ 8unzip(8seq_tail(8S), 8L, \ 8seq_push_back(8seq_head(8S), 8R), 8true)))) ) #lang racket (define (luhn-test n) (let loop ([n n] [odd? a\Faild$ include "seed7_05.s7i"; const func boolean: luhn Test (in string: card Number) is func result var boolean: luhn Test is FALSE; local var integer: index is 0; var integer: digit is 0; var boolean: is Odd is TRUE; var integer: odd Sum is 0; var integer: even Sum is 0; begin for index range length(card Number) downto 1 do digit := integer parse str(card Number[index]); if is Odd then odd Sum := digit; else even Sum := digit div 5 (2 * digit) rem 10; end if; is Odd := not is Odd; end for; luhn Test := (odd Sum even Sum) rem 10 = 0; end func; const proc: main is func local var string: card Number is ""; begin for card Number range [] ("49927398716", "49927398717", "1234567812345678", "1234567812345670") do writeln(card Number ; j = j 1 sum = sum d :(ln2)ln3 luhn = 0; luhn = eq(remdr(sum,10),0) 1 :(return)luhn_end * # Test and display test = " output = luhn(n) ': ' n" n = '49927398716'; eval(test) n = '49927398717'; eval(test) n = '1234567812345678'; eval(test) n = '1234567812345670'; eval(test)end Works with SPARK GPL 2010 and GPS GPL 2010. 9 then digit Sum (n div 10 n mod 10) else n fun luhn_sum [] = 0 | luhn_sum [d] = d | luhn_sum (d::d'::ds) = d digit Sum (2*d') luhn_sum dsin fun luhn_test n = luhn_sum (rev Digits n) mod 10 = 0 val res = map luhn_test [49927398716, 49927398717, 1234567812345678, 1234567812345670];end; (*[opening file "luhn.sml"] CREATE FUNCTION dbo._Credit Card Num Check( @str CCNum Var Char(40) )RETURNS Var Char(7)ASBEGIN DECLARE @string Var Char(40) = REVERSE(@str CCNum); -- usage: set once, never changed DECLARE @str S2Values Var Char(10) = '0246813579'; -- constant: maps digits to their S2 summed values DECLARE @table TABLE (ID INT, Value INT, S_Value INT); -- ID=digit position. DECLARE @p INT = 0; -- loop counter: position in string -- Convert the reversed string's digits into rows in a table variable, S_Values to be updated afterwards WHILE @p /:") SET esum=SUM (estring) SET s2=APPEND (s2,esum) ELSE SET s2=APPEND (s2,even) ENDIF ELSE SET s1=APPEND(s1,oe) ENDIF ENDLOOPSET s1=SUM(s1),s2=SUM(s2)SET checksum=s1 s2SET c=CENTER(c,-adjust)IF ("0") THEN PRINT c,"true"ELSE PRINT c,"false"[email protected](do (defun luhn (num) (for ((i 1) (sum 0)) ((not (zerop num)) (zerop (mod sum 10))) ((inc i) (set num (trunc num 10))) (let ((dig (mod num 10))) (if (oddp i) (inc sum dig) (let ((dig2 (* 2 dig))) (inc sum ( (trunc dig2 10) (mod dig2 10)))))))))@(collect :vars nil)@@(output)@ccnumber - 9, n - 9, n)) Mod 10 = 0 End Function Sub Main() Console. Val ) next dim sum as integer for each digit as string in digit Arr sum = sum digit.



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