For Java Programming

Step 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

Step 2. Now add all single-digit numbers from Step 1.

4 + 4 + 8 + 2 + 3 + 1 + 7 + 8 = 37

Step 3. Add all digits in the odd places from right to left in the card number.

6 + 6 + 0 + 8 + 0 + 7 + 8 + 3 = 38

Step 4. Sum the results from Step 2 and Step 3.

37 + 38 = 75

Step 5. If the result from Step 4 is divisible by 10, the card number is valid; otherwise, it is invalid. For example, the number 4388576018402626 is invalid, but the number 4388576018410707 is valid.

Program Requirements:

Write a program that accepts a credit card number from Cmd argument list and display whether the number is valid or invalid. Your program must define and use following methods (at least)

boolean isValid(long number)

// returns true if the card number is valid

int sumOfDoubleEvenPlace(long number)

// gets the result from steps 1 and 2 above

int sumOfOddPlace(long number)

// gets sum of odd place digits in number from step 3 above

void main(String[] args)

// test program that takes input and displays output by invoking necessary methods