Added codes, datasets and Jupyter notebooks directory.

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+# Additional Codes for Apache Scala (Code-B4)
+
+---
+
+## 1. Even-Odd Check
+
+```scala
+object EvenOddCheck {
+  def main(args: Array[String]): Unit = {
+    val number = 15
+    if (number % 2 == 0) {
+      println(s"$number is even")
+    } else {
+      println(s"$number is odd")
+    }
+  }
+}
+```
+
+## 2. Factorial
+
+```scala
+object Factorial {
+  def main(args: Array[String]): Unit = {
+    val num = 5
+    var factorial = 1
+    for (i <- 1 to num) {
+      factorial *= i
+    }
+    println(s"The factorial of $num is $factorial")
+  }
+}
+```
+
+## 3. String reversal
+
+```scala
+object ReverseString {
+  def main(args: Array[String]): Unit = {
+    val str = "Scala"
+    val reversed = str.reverse
+    println(s"The reverse of '$str' is '$reversed'")
+  }
+}
+```
+
+## 4. Find largest element in an array
+
+```scala
+object FindLargest {
+  def main(args: Array[String]): Unit = {
+    val numbers = Array(10, 20, 30, 40, 50)
+    val largest = numbers.max
+    println(s"The largest number in the array is $largest")
+  }
+}
+```
+
+## 5. Sum of two numbers
+
+```scala
+object SumOfTwoNumbers {
+  def main(args: Array[String]): Unit = {
+    val num1 = 10
+    val num2 = 20
+    val sum = num1 + num2
+    println(s"The sum of $num1 and $num2 is $sum")
+  }
+}
+```
+
+## 6. Sum of two numbers (with user input)
+
+```scala
+import scala.io.StdIn
+
+object AddTwoNumbers {
+  def main(args: Array[String]): Unit = {
+    println("Enter the first number:")
+    val num1 = StdIn.readInt()
+    println("Enter the second number:")
+    val num2 = StdIn.readInt()
+    
+    val sum = num1 + num2
+    println(s"The sum of $num1 and $num2 is $sum")
+  }
+}
+```
+
+## 7. Simple Calculator
+
+```scala
+import scala.io.StdIn
+
+object SimpleCalculator {
+  def main(args: Array[String]): Unit = {
+    println("Enter the first number:")
+    val num1 = StdIn.readDouble()
+    println("Enter an operator (+, -, *, /):")
+    val operator = StdIn.readChar()
+    println("Enter the second number:")
+    val num2 = StdIn.readDouble()
+
+    val result = operator match {
+      case '+' => num1 + num2
+      case '-' => num1 - num2
+      case '*' => num1 * num2
+      case '/' => if (num2 != 0) num1 / num2 else "undefined (division by zero)"
+      case _ => "Invalid operator"
+    }
+
+    println(s"The result is: $result")
+  }
+}
+```
+
+---