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payment card valider #1341

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payment card valider #1341

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231 changes: 115 additions & 116 deletions ValidateCreditCard.java
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Original file line number Diff line number Diff line change
@@ -1,124 +1,123 @@
import java.util.*;
public class Test {

public static void main(String args[])
{int sum1=0;
int sum2=0;
int sum=0;
String t;
boolean isvalid=false;
System.out.println("Please enter your cradit card number");
Scanner d=new Scanner(System.in);
t=d.nextLine();
isvalid =check(t);
System.out.println(isvalid);
if(isvalid==true)
{
int k;
for(int x=(t.length())-2;x>=0;x-=2)
{
char c=t.charAt(x);
int b=Integer.parseInt(c+"");
int r=b*2;
if(r>9)
{
k=r%10+r/10;
sum1+=k;
}
else
{
sum1+=r;

}
import java.util.Scanner;

public class CardValidator {

public static void main(String[] args) {
System.out.println("Please enter your card number:");
Scanner scanner = new Scanner(System.in);
String cardNumber = scanner.nextLine();

if (isValidCardNumber(cardNumber)) {
System.out.println("Card number is valid.");
identifyCardType(cardNumber);
displayAccountNumber(cardNumber);
} else {
System.out.println("Card number is not valid.");
suggestCheckDigit(cardNumber);
}
scanner.close();
}

// Validate card number using Luhn's algorithm
private static boolean isValidCardNumber(String cardNumber) {
if (!isNumeric(cardNumber) || !(cardNumber.length() >= 12 && cardNumber.length() <= 19)) {
return false;
}

for(int x=(t.length())-1;x>=0;x-=2)
{
char c=t.charAt(x);
int g=Integer.parseInt(c+"");
sum2+=g;
}
sum=sum1+sum2;
if(sum%10==0)
{
System.out.println("credit card number is valid");
MII(t);
IIN(t);
account(t);
}
else
{System.out.println("Not valid");
char f=t.charAt(t.length()-1);
int u=Integer.parseInt(f+"");
int i=sum-u;
int x=i%10;
int z=10-x;

System.out.println("Check Digit will be:"+z);

int sum1 = 0, sum2 = 0;

for (int x = cardNumber.length() - 2; x >= 0; x -= 2) {
int digit = Character.getNumericValue(cardNumber.charAt(x));
int doubled = digit * 2;
sum1 += (doubled > 9) ? (doubled % 10 + 1) : doubled;
}

for (int x = cardNumber.length() - 1; x >= 0; x -= 2) {
sum2 += Character.getNumericValue(cardNumber.charAt(x));
}

int totalSum = sum1 + sum2;
return totalSum % 10 == 0;
}

// Check if the string is numeric
private static boolean isNumeric(String str) {
for (char c : str.toCharArray()) {
if (!Character.isDigit(c)) {
return false;
}
}
return true;
}

// Identify card type based on the number
private static void identifyCardType(String cardNumber) {
String firstDigit = String.valueOf(cardNumber.charAt(0));
String firstTwoDigits = cardNumber.substring(0, 2);
String firstFourDigits = cardNumber.substring(0, 4);

switch (firstDigit) {
case "3":
System.out.println("Card Type: Travel/Entertainment (Amex)");
break;
case "4":
System.out.println("Card Type: Visa");
break;
case "5":
System.out.println("Card Type: Mastercard");
break;
case "6":
System.out.println("Card Type: Discover/Merchandising");
break;
case "7":
System.out.println("Card Type: Petroleum");
break;
case "8":
System.out.println("Card Type: Healthcare and Telecommunications");
break;
default:
System.out.println("Card Type: Unknown");
break;
}

// Additional checks for specific card ranges
if (firstTwoDigits.equals("34") || firstTwoDigits.equals("37")) {
System.out.println("Card Type: American Express");
} else if (firstTwoDigits.matches("51|52|53|54|55")) {
System.out.println("Card Type: Mastercard");
} else if (firstFourDigits.equals("6011") || firstFourDigits.matches("644|65")) {
System.out.println("Card Type: Discover");
}
}
}
public static boolean check(String s)
{
int count=0;
for(int x=0;x<s.length();x++)
{
char c=s.charAt(x);
if(Character.isDigit(c))
{
count++;

// Display account number extracted from the card number
private static void displayAccountNumber(String cardNumber) {
String accountNumber = cardNumber.substring(6, cardNumber.length() - 1);
System.out.println("Account Number: " + accountNumber);
}

// Suggest a check digit if the card number is not valid
private static void suggestCheckDigit(String cardNumber) {
char lastDigit = cardNumber.charAt(cardNumber.length() - 1);
int sum = calculateLuhnSum(cardNumber.substring(0, cardNumber.length() - 1));
int checkDigit = (10 - (sum % 10)) % 10;
System.out.println("Suggested Check Digit: " + checkDigit);
}

// Calculate sum for Luhn's algorithm excluding the last digit
private static int calculateLuhnSum(String number) {
int sum1 = 0, sum2 = 0;

for (int x = number.length() - 2; x >= 0; x -= 2) {
int digit = Character.getNumericValue(number.charAt(x));
int doubled = digit * 2;
sum1 += (doubled > 9) ? (doubled % 10 + 1) : doubled;
}

for (int x = number.length() - 1; x >= 0; x -= 2) {
sum2 += Character.getNumericValue(number.charAt(x));
}

return sum1 + sum2;
}
if(count==s.length()&&(s.length()>=12||s.length()<=19))
return true;
else
return false;
}
public static void MII(String n)
{
if(n.charAt(0)=='1'||n.charAt(0)=='2')
System.out.println("Airlines");
else
if(n.charAt(0)=='3')
System.out.println("Travel");
else
if(n.charAt(0)=='4'||n.charAt(0)=='5')
System.out.println("Banking And Financial");
else
if(n.charAt(0)=='6')
System.out.println("Merchandising And Banking/Financial");
else
if(n.charAt(0)=='7')
System.out.println("Petrolium");
else
if(n.charAt(0)=='8')
System.out.println("Healthcare And Telecommunications");
else

System.out.println("Unknown");
}
public static void IIN(String h)
{
String q=h.substring(0,2);
String o=h.substring(0,1);
String p=h.substring(0,4);
if(q.equals("34")||q.equals("37"))
System.out.println("Amex");
else if(q.equals("51")||q.equals("52")||q.equals("53")||q.equals("54")||q.equals("55"))
System.out.println("Mastercard");
else if(o.equals("4"))
System.out.println("Visa");
else if(p.equals("6011")||p.equals("644")||p.equals("65"))
System.out.println("Discover");
else
System.out.println("Unknown");
}
public static void account(String v)
{
String w=v.substring(7,v.length()-1);
System.out.println("Account Number is"+' '+w);

}