I would like to run a program that can determine the validation and type of credit card number based of number entered. Compiler shows notification that there is an error in my coding but I cannot detect where is it. The program is also cannot be run. Below is the coding,
import java.util.*;
public class CreditCard {
public static void main(String args[]) {
String CType;(String number) {
if (number.startsWith("4"))
return "Visa";
else if (number.startsWith("5"))
return "MasterCard";
else if (number.startsWith("6"))
return "Discover";
else if (number.startsWith("37"))
return "American Express";
else
return "Unknown type";
};
Scanner input = new Scanner(System.in);
System.out.println("Enter a credit card number: ");
long number = input.nextLong();
long total = sumOfEvenPlaces(number) + (sumOfOddPlaces(number)*2);
if (isValid(total)) {
System.out.println("The "+CType+" card number is valid");
} else {
System.out.println("The "+CType+" card number is invalid.");
}
}
public static boolean isValid(long total) {
if (total % 10 != 0) {
} else {
return true;
}
return false;
}
public static int sumOfEvenPlaces(long number) {
int sum = 0;
int remainder;
while (number % 10 != 0 || number / 10 != 0) {
remainder = (int) (number % 10);
sum = sum + getDigit(remainder * 2);
number /= 100;
}
return sum;
}
public static int getDigit(int number) {
if (number > 9) {
return (number % 10 + number / 10);
}
return number;
}
public static int sumOfOddPlaces(long number) {
int sum = 0;
int remainder;
number /= 10;
while (number % 10 != 0 || number / 10 != 0) {
remainder = (int) (number % 10);
sum = sum + getDigit(remainder * 2);
number /= 100;
}
return sum;
}
}
This may be more along the lines of what you're trying to do:
On a stylistic note,
CType
should start with a lower case letter (e.g.cType
). You'll have to experiment with the use ofScanner
as well as I'm not sure my implementation will do what you're looking for.