Validate International Securities Identification Number: Difference between revisions

Content added Content deleted
(→‎{{header|Java}}: Fixed this example so the input and output now correspond. Embedded the luhnTest method in the ISIN class.)
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=={{header|Java}}==
=={{header|Java}}==
⚫
As the Luhn test method from the ''[[Luhn test of credit card numbers]]'' task is only a few lines, it has been embedded in the ISIN class for convenience.
{{incorrect|Java|Output isn't according to the input.}}
⚫
This now assumes that the existing Luhn algorithm implementation from the ''[[Luhn test of credit card numbers]]'' task is available in the same (default) package.


<lang java>public class ISIN {
<lang java>public class ISIN {

public static void main(String[] args) {
public static void main(String[] args) {
String[] isins = {
String[] isins = {
"US0378331005",
"US0378331005",
"US0373831005",
"US0373831005",
"U50378331005",
"U50378331005",
"US03378331005",
"US03378331005",
"AU0000XVGZA3",
"AU0000XVGZA3",
"AU0000VXGZA3",
"AU0000VXGZA3",
"FR0000988040",
"FR0000988040"
};
};
for (String isin : isins)
for (String isin : isins)
System.out.printf("%s is %s%n\n", isin, ISINtest(isin) ? "valid" : "not valid");
System.out.printf("%s is %s\n", isin, ISINtest(isin) ? "valid" : "not valid");
}
}

static boolean ISINtest(String isin) {
static boolean ISINtest(String isin) {
isin = isin.trim().toUpperCase();
isin = isin.trim().toUpperCase();

if (!isin.matches("^[A-Z]{2}[A-Z0-9]{9}\\d$"))
if (!isin.matches("^[A-Z]{2}[A-Z0-9]{9}\\d$"))
return false;
return false;

StringBuilder sb = new StringBuilder();
StringBuilder sb = new StringBuilder();
for (char c : isin.substring(0, 12).toCharArray())
for (char c : isin.substring(0, 12).toCharArray())
sb.append(Character.digit(c, 36));
sb.append(Character.digit(c, 36));
return luhnTest(sb.toString());
}


return Luhn.luhnTest(sb.toString());
static boolean luhnTest(String number) {
int s1 = 0, s2 = 0;
String reverse = new StringBuffer(number).reverse().toString();
for (int i = 0; i < reverse.length(); i++){
int digit = Character.digit(reverse.charAt(i), 10);
//This is for odd digits, they are 1-indexed in the algorithm.
if (i % 2 == 0){
s1 += digit;
} else { // Add 2 * digit for 0-4, add 2 * digit - 9 for 5-9.
s2 += 2 * digit;
if(digit >= 5){
s2 -= 9;
}
}
}
return (s1 + s2) % 10 == 0;
}
}
}</lang>
}</lang>

<pre>US0378331005 is valid
<pre>US0378331005 is valid
US0373831009 is valid
US0373831005 is not valid
D56000543287 is not valid
U50378331005 is not valid
⚫
US03378331005 is not valid
AU0000XVGZA3 is valid
AU0000XVGZA3 is valid
AU0000VXGZA3 is valid
AU0000VXGZA3 is valid
GB0002634946 is valid
FR0000988040 is valid</pre>
⚫
US0373831005 is not valid</pre>


=={{header|Julia}}==
=={{header|Julia}}==
Retrieved from "https://rosettacode.org/wiki/Validate_International_Securities_Identification_Number"