IBAN: Difference between revisions
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GB82WEST12345698765432 is valid.
GB82TEST12345698765432 is invalid.</pre>
=={{header|C++}}==
<lang C++>#include <string>
#include <iostream>
#include <boost/algorithm/string.hpp>
#include <map>
#include <algorithm>
#include <cctype>
using namespace boost::algorithm ;
bool isValid ( const std::string &ibanstring ) {
static std::map<std::string, int> countrycodes
{ {"AL" , 28} , {"AD" , 24} , {"AT" , 20} , {"AZ" , 28 } ,
{"BE" , 16} , {"BH" , 22} , {"BA" , 20} , {"BR" , 29 } ,
{"BG" , 22} , {"CR" , 21} , {"HR" , 21} , {"CY" , 28 } ,
{"CZ" , 24} , {"DK" , 18} , {"DO" , 28} , {"EE" , 20 } ,
{"FO" , 18} , {"FI" , 18} , {"FR" , 27} , {"GE" , 22 } ,
{"DE" , 22} , {"GI" , 23} , {"GR" , 27} , {"GL" , 18 } ,
{"GT" , 28} , {"HU" , 28} , {"IS" , 26} , {"IE" , 22 } ,
{"IL" , 23} , {"IT" , 27} , {"KZ" , 20} , {"KW" , 30 } ,
{"LV" , 21} , {"LB" , 28} , {"LI" , 21} , {"LT" , 20 } ,
{"LU" , 20} , {"MK" , 19} , {"MT" , 31} , {"MR" , 27 } ,
{"MU" , 30} , {"MC" , 27} , {"MD" , 24} , {"ME" , 22 } ,
{"NL" , 18} , {"NO" , 15} , {"PK" , 24} , {"PS" , 29 } ,
{"PL" , 28} , {"PT" , 25} , {"RO" , 24} , {"SM" , 27 } ,
{"SA" , 24} , {"RS" , 22} , {"SK" , 24} , {"SI" , 19 } ,
{"ES" , 24} , {"SE" , 24} , {"CH" , 21} , {"TN" , 24 } ,
{"TR" , 26} , {"AE" , 23} , {"GB" , 22} , {"VG" , 24 } } ;
std::string teststring( ibanstring ) ;
erase_all( teststring , " " ) ; //defined in boost/algorithm/string.hpp
if ( countrycodes.find( teststring.substr(0 , 2 )) == countrycodes.end( ) )
return false ;
if ( teststring.length( ) != countrycodes[ teststring.substr( 0 , 2 ) ] )
return false ;
if ( ! ( all ( teststring , is_alnum( ) ) ) )
return false ;
to_upper( teststring ) ;
teststring = teststring.append( teststring.substr( 0 , 4 ) ) ;
teststring.assign( teststring.substr( 4 ) ) ;
std::string numberstring ;//will contain the letter substitutions
for ( int i = 0 ; i < teststring.length( ) ; i++ ) {
if ( std::isdigit( teststring[ i ] ) )
numberstring = numberstring + teststring[ i ] ;
if ( std::isupper( teststring[ i ] ) )
numberstring = numberstring + std::to_string( static_cast<int>( teststring[ i ] ) - 55 ) ;
}
//implements a stepwise check for mod 97 in chunks of 9 at the first time
// , then in chunks of seven prepended by the last mod 97 operation converted
//to a string
int segstart = 0 ;
int step = 9 ;
std::string prepended ;
long number = 0 ;
while ( segstart < numberstring.length( ) - step ) {
number = std::stol( prepended + numberstring.substr( segstart , step ) ) ;
int remainder = number % 97 ;
prepended = std::to_string( remainder ) ;
if ( remainder < 10 )
prepended = "0" + prepended ;
segstart = segstart + step ;
step = 7 ;
}
number = std::stol( prepended + numberstring.substr( segstart )) ;
return ( number % 97 == 1 ) ;
}
int main( ) {
std::cout << "GB82 WEST 1234 5698 7654 32 is " << ( isValid( "GB82 WEST 1234 5698 7654 32" ) ? "" : "not " )
<< "valid!" << std::endl ;
std::cout << "GB82TEST12345698765432 is " << ( isValid( "GB82TEST12345698765432" ) ? "" : "not " )
<< "valid!" << std::endl ;
return 0 ;
}</lang>
{{out}}
<pre>GB82 WEST 1234 5698 7654 32 is valid!
GB82TEST12345698765432 is not valid!</pre>
=={{header|Caché ObjectScript}}==
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