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Credit card numbers follow certain pattern. A credit card number must be 16 digits, and must start with
• 4 for Visa cards
• 5 for Master cards
• 37 for American Express cards
• 6 for Discover cards
Suppose that you were asked to write down a Java program that validates the credit card number (if it is correct or not!). Here are the rules that determine the correctness of credit card number:
Suppose the credit card number = 4388576018402625
1) Double every second digit from right to left. If doubling of a digit results in a two-digit number, add up the two digits to get a single digit number:
2*2 = 4
2*2 = 4
4*2 = 8
1*2 = 2
6*2 = 12 (1 + 2) = 3
5*2 = 10 (1 + 0) = 1
8*2 = 16 (1 +6) = 7
4*2 = 8

2) Now add all single-digit number from step 1 (4+4+8+2+3+1+7+8 = 37)

3) Add all digits in the odd places from right to left in the card number:
5+6+0+8+0+7+8+3 = 37

4) Sum the results from step 2 and 3
37 + 37 = 74

5) If the result in step 4 is divisible by 10, then credit card is valid, else it is not valid.
74 is not divisible by 10, so it is not valid!
Write a java program to accept a credit card number from keyboard as long, and then prints on screen, if it is valid or not. You should use the following:
public static int[] fillArray(long) : this method fills the credit card number in an array
public static int getSum(int[]) :calculated the summation from step 1 and 2
Public static int getOddSum(int[]): calculates the summation from step 3
Public static boolean isValid(int, int): determines if valid or not according to step 5.