diff --git a/Answers/40230212013/functionsIntroduction.java b/Answers/40230212013/functionsIntroduction.java
new file mode 100644
index 0000000..9c49276
--- /dev/null
+++ b/Answers/40230212013/functionsIntroduction.java
@@ -0,0 +1,138 @@
+import java.util.Scanner;
+
+
+public class functionsIntroduction {
+  public static String fullName(String firstName , String lastName)
+  {
+   return capitalizeFirstLetter(firstName)+ " "+ capitalizeFirstLetter(lastName);
+  }
+  private static String capitalizeFirstLetter(String str)
+  {
+    return str.substring(0,1).toUpperCase() + str.substring(1).toLowerCase();
+  }
+  /********************************************************************************************************************************************************************************** */
+  public static String phoneNumber(String phone) {
+    if (phone.length() == 10 && phone.startsWith("9")) {
+        return "0" + phone;
+    } else {
+        System.out.println("Wrong entry. Try again.");
+        return phoneNumber(new Scanner(System.in).nextLine());
+    }
+  }
+  /*********************************************************************************************************************************************************************************** */
+  public static String userId(String id)
+  {
+    if (id.length() >= 4 || id.length() <= 13)
+    {
+      return id;
+    }
+    else
+    {
+      System.out.println("userID should be between 4 to 13 digits. try again.");
+      return userId(new Scanner(System.in).nextLine());
+    }
+  }
+  /********************************************************************************************************************************************************************************** */
+  public static String[] getInterests(int maxInterests) 
+  {
+        Scanner scanner = new Scanner(System.in);
+        String[] interests = new String[maxInterests];
+        int count = 0;
+        System.out.println("Enter your interests (max 10):");
+        while (count < maxInterests)
+         {
+            String interest = scanner.nextLine();
+            if (interest.isEmpty()) 
+            {
+                break; // User finished entering interests
+            }
+            interests[count] = interest;
+            count++;
+        }
+        return interests;
+    }
+    /********************************************************************************************************************************************************************************** */
+    public static String userFullInformation(String fullName, String phone, String id, String[] interests)
+    {
+      StringBuilder full = new StringBuilder();
+      full.append("Hello! My name is ").append(fullName).append(". My ID is ").append(id).append(". Here are some of my interests:\n");
+      for(int i=0; i < interests.length && interests[i] != null; i++)
+      {
+        full.append(i+1).append(". ").append(interests[i]).append("\n");
+      }
+      full.append("You can reach me via my phone number ").append(phone).append("\n");
+      return full.toString();
+    }
+    /********************************************************************************************************************************************************************************** */
+    public static String informationEncoder(String information, int shift)
+    {
+      StringBuilder encode = new StringBuilder();
+      for(int i = 0 ; i < information.length() ; i++)
+      {
+        char c = information.charAt(i);
+        if(Character.isAlphabetic(c))
+        {
+          int newChar = c+shift;
+          if(Character.isUpperCase(c))
+          {
+            encode.append((char)(newChar < 'A' ? newChar + 26 : newChar));
+          }
+          else
+          {
+            encode.append((char)(newChar < 'a' ? newChar + 26 : newChar));
+          }
+        }
+        else {
+          encode.append(c);
+        }
+      }
+      return encode.toString();
+    }
+    /********************************************************************************************************************************************************************************** */
+    public static String informationDecoder(String information, int shift)
+    {
+      return informationEncoder(information, -shift);
+    }
+  public static void main(String[] args) {
+    Scanner input = new Scanner(System.in);
+    System.out.println("Enter your First Name: ");
+    String firstName = input.nextLine();
+    System.out.println("Enter your Last Name: ");
+    String lastName = input.nextLine();
+    String fullName = fullName(firstName, lastName);
+    System.out.println("Enter your Phone Number: ");
+    String phone = phoneNumber(input.nextLine());
+    System.out.println("Enter your ID: ");
+    String id = userId(input.nextLine());
+    String[] interests = getInterests(10);
+    String fullInformation = userFullInformation(fullName, phone, id, interests);
+     while(true)
+    {
+    System.out.println("Would you Like to see the encoded information? (y for yes/n for no)");
+    String choice = input.nextLine().toLowerCase();
+    if(choice.equals("y"))
+    {
+      System.out.print("How many units should the letters be shifted? (Enter a positive number): ");
+      int shift = Integer.parseInt(input.nextLine());
+      String encodedInformation = informationEncoder(fullInformation, shift);
+      System.out.println(encodedInformation);
+      System.out.println("Would you Like to see the decoded information? (y for yes/n for close the program)");
+      String choice2 = input.nextLine().toLowerCase();
+      if(choice2.equals("y"))
+      {
+        System.out.println(informationDecoder(fullInformation, shift));
+        continue;
+      }
+      else
+      {
+      break;
+      }
+    }
+    else
+    {
+      System.out.println(fullInformation);
+
+    }
+  }
+}
+}