[Mr.Ahmad]

المشاركة الأصلية كتبت بواسطة هوتميلكوم السلام عليكم ورحمة الله وبركاته أخي أحمد إن أمكن أتمنى ان تحل لي السؤال التالي بلغة الجافا وجزاك الله خيراً.. 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.

وعليكم السلام ورحمة الله وبركاته .

تفضلي :

كود PHP:

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        System.out.print("Please Enter the Number of Cridit Card : ");
        Scanner sc = new Scanner(System.in);
        long numberCard = sc.nextLong();
        int[] digit = fillArray(numberCard);
        
        if (digit.length != 16)
        {
            System.out.println("not valid.");
            return;
        }
        Boolean isVaild = isValid(getSum(digit), getOddSum(digit));
        if (isVaild)
        {
            System.out.println("valid.");
        } else {
            System.out.println("not valid.");
        }
        
    }
    public static int[] fillArray (long x)
    {
        String txt = String.valueOf(x);
        int digit [] = new int[txt.length()];
        for (int i = 0; i < txt.length(); i++)
        {
            digit[i] = txt.charAt(i);
        }
        return digit;
    }
    public static int getSum(int[] digit)
    {
        int doubleEven [] = new int[digit.length / 2];
        int sum = 0;
        for (int i = 1, j = 0; i < digit.length; i += 2, j++)
        {
            doubleEven[j] = digit[i] * 2;
        }
        for (int i = 0 ; i < doubleEven.length ;i++)
        {
            sum += doubleEven[i];
        }
        return sum;
    }
    public static int getOddSum(int[] digit)
    {
        int oddSum[] = new int[digit.length / 2];
        int sum = 0;
        for (int i = 0, j = 0; i < digit.length; i += 2, j++) {
            oddSum[j] = digit[i];
        }
        for (int i = 0; i < oddSum.length; i++) {
            sum += oddSum[i];
        }
        return sum;
    }
    public static boolean isValid(int even, int odd)
    {
        int sum = even + odd;
        if ((sum % 10) == 0 ) return true;
        else return  false;
    }
} 


بالتوفيق .