diff --git a/lab3/src/main/java/mes/casetools/lab3/bca_2205121/cal.class b/lab3/src/main/java/mes/casetools/lab3/bca_2205121/cal.class
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diff --git a/lab3/src/main/java/mes/casetools/lab3/bca_2205121/cal.java b/lab3/src/main/java/mes/casetools/lab3/bca_2205121/cal.java
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+package mes.casetools.lab3.bca_2205121;
+/**
+ * This class represents a simple calculator that can perform
+ * basic arithmetic operations like addition, subtraction,
+ * multiplication, and division.
+ *
+ * @author Your Name
+ * @version 1.0
+ * @since 2023-03-09
+ */
+public class cal {
+     /**
+     * Adds two numbers together.
+     *
+     * @param a the first number
+     * @param b the second number
+     * @return the sum of the two numbers
+     */
+    public static double add(double a, double b) {
+        return a + b;
+    }
+
+    /**
+     * Subtracts the second number from the first.
+     *
+     * @param a the first number
+     * @param b the second number
+     * @return the difference between the two numbers
+     */
+    public static double subtract(double a, double b) {
+        return a - b;
+    }
+
+    /**
+     * Multiplies two numbers together.
+     *
+     * @param a the first number
+     * @param b the second number
+     * @return the product of the two numbers
+     */
+    public static double multiply(double a, double b) {
+        return a * b;
+    }
+
+    /**
+     * Divides the first number by the second.
+     *
+     * @param a the first number (dividend)
+     * @param b the second number (divisor)
+     * @return the quotient of the two numbers
+     * @throws ArithmeticException if the divisor is zero
+     */
+    public static double divide(double a, double b) throws ArithmeticException {
+        if (b == 0) {
+            throw new ArithmeticException("Cannot divide by zero");
+        }
+        return a / b;
+    }
+
+    /**
+     * The main method to test the calculator.
+     *
+     * @param args command-line arguments (not used)
+     */
+    public static void main(String[] args) {
+        double num1 = 10.0;
+        double num2 = 5.0;
+
+        System.out.println("Addition: " + add(num1, num2));
+        System.out.println("Subtraction: " + subtract(num1, num2));
+        System.out.println("Multiplication: " + multiply(num1, num2));
+        System.out.println("Division: " + divide(num1, num2));
+    }
+}