From 9efb4636e87a77b5b698fad21b2611f3868b573b Mon Sep 17 00:00:00 2001
From: Caleb Fontenot <foley2431@gmail.com>
Date: Fri, 11 Nov 2022 13:01:30 -0600
Subject: [PATCH] Work on MP4

---
 .gitignore                                    |  2 +
 .../mp4_calebfontenot/MP4_CalebFontenot.java  | 74 ++++++++++---------
 2 files changed, 43 insertions(+), 33 deletions(-)

diff --git a/.gitignore b/.gitignore
index 8bd1954..7e3f03e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,3 +35,5 @@
 /Assignments/MP4_CalebFontenot/nbproject/private/
 /Assignments/lab14_CalebFontenot/nbproject/private/
 /Assignments/lab14_CalebFontenot/build/
+/Assignments/MP4_CalebFontenot/build/
+/Assignments/MP4_CalebFontenot/dist/
diff --git a/Assignments/MP4_CalebFontenot/src/mp4_calebfontenot/MP4_CalebFontenot.java b/Assignments/MP4_CalebFontenot/src/mp4_calebfontenot/MP4_CalebFontenot.java
index 4665334..965406a 100644
--- a/Assignments/MP4_CalebFontenot/src/mp4_calebfontenot/MP4_CalebFontenot.java
+++ b/Assignments/MP4_CalebFontenot/src/mp4_calebfontenot/MP4_CalebFontenot.java
@@ -9,19 +9,16 @@ package mp4_calebfontenot;
  *
  * @author caleb
  */
-public class MP4_CalebFontenot
-{
+public class MP4_CalebFontenot {
 
     /**
-     * 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
+     * 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
      *
      * @param CreditCard
      * @return
      */
-    public static boolean isValid(String CreditCard)
-    {
+    public static boolean isValid(String CreditCard) {
+
         return true;
     }
 
@@ -32,64 +29,75 @@ public class MP4_CalebFontenot
      * @param step3 result form step 3
      * @return
      */
-    public static int sum(int step1andSep2, int step3)
-    {
+    public static int sum(int step1andSep2, int step3) {
         return step1andSep2 + step3;
     }
 
     /**
-     * Add all digits in the odd places from right to left in the card number. 6
-     * + 6 + 0 + 8 + 0 + 7 + 8 + 3 = 38
+     * Add all digits in the odd places from right to left in the card number. 6 + 6 + 0 + 8 + 0 + 7 + 8 + 3 = 38
      *
      * @param -creditCard the credit card number to be processed.
      * @return the sum of digits at odd position from right to left.
      */
-    public static int addOddNumbersFromRightToLeft(String creditCard)
-    {
+    public static int addOddNumbersFromRightToLeft(String creditCard) {
         return -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
+     * 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
      *
      * @param -creditCard the credit card number to be processed.
      * @return
      */
-    public static int doubleDigitsAndSumSingleDigits(String creditCard)
-    {
+    public static int doubleDigitsAndSumSingleDigits(String creditCard) {
+        // Iterate through string
+        int creditCardLength = creditCard.length();
+        int currentDigit, digitProduct, tensDigit, onesDigit;
+        //System.out.println(creditCard.length());
+
+        for (int i = 15; i >= 0; i = i - 2) {
+            currentDigit = Character.getNumericValue(creditCard.charAt(i)); // Parses current digit as an integer so we can do math on it
+            digitProduct = currentDigit * 2;
+            System.out.println(digitProduct);
+            if (digitProduct > 9) { // Product is larger than 9
+                tensDigit = currentDigit / 10 % 10;
+                onesDigit = currentDigit / 1 % 10;
+                System.out.println("tensDigit is " + tensDigit);
+                System.out.println("onesDigit is " + onesDigit);
+            }
+
+        }
         return -1;
     }
 
     /**
-     * Displays Q/q or C/c. If the user enters C, it read the credit number and
-     * returns it as String. If the user types Q/q returns 0
+     * Displays Q/q or C/c. If the user enters C, it read the credit number and returns it as String. If the user types Q/q returns 0
      *
      * @return a string with credit card number or 0.
      */
-    public static String menu()
-    {
+    public static String menu() {
         return "creditcard number or 0";
     }
-/**
- * 
- * @param args 
- */
-    public static void main(String[] args)
-    {
+
+    /**
+     *
+     * @param args
+     */
+    public static void main(String[] args) {
+        // DEBUG
+        //System.out.println(isValid("4388576018402626"));
+        MP4_CalebFontenot.doubleDigitsAndSumSingleDigits("4388576018402626");
+        /*
         String userInput = menu();
+        
         while (!userInput.equals("0") )//user has not entered Q/q
           {
-            MP4.doubleDigitsAndSumSingleDigits(userInput);
+            MP4_CalebFontenot.doubleDigitsAndSumSingleDigits(userInput);
             //complete the code
             userInput = menu();
             
           }
+         */
     }
 
 }
-