diff --git a/CalculateAverageAndTotal.class b/CalculateAverageAndTotal.class
new file mode 100644
index 0000000..e55030b
Binary files /dev/null and b/CalculateAverageAndTotal.class differ
diff --git a/CalculateAverageAndTotal.java b/CalculateAverageAndTotal.java
new file mode 100644
index 0000000..b64bfbc
--- /dev/null
+++ b/CalculateAverageAndTotal.java
@@ -0,0 +1,27 @@
+import java.util.Scanner;
+
+public class CalculateAverageAndTotal {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        int numberOfSubjects = 5;
+        int[] marks = new int[numberOfSubjects];
+        
+        System.out.println("Enter marks for " + numberOfSubjects + " subjects:");
+        for (int i = 0; i < numberOfSubjects; i++) {
+            System.out.print("Subject " + (i + 1) + ": ");
+            marks[i] = scanner.nextInt();
+        }
+        
+        int total = 0;
+        for (int mark : marks) {
+            total += mark;
+        }
+        
+        double average = (double) total / numberOfSubjects;
+        
+        System.out.println("\nTotal marks: " + total);
+        System.out.println("Average marks: " + average);
+        
+        scanner.close();
+    }
+}
diff --git a/Calculator.java b/Calculator.java
new file mode 100644
index 0000000..c24430b
--- /dev/null
+++ b/Calculator.java
@@ -0,0 +1,34 @@
+import java.util.Scanner;
+
+class Calculator {
+
+    public static void main(String args[]) {
+        int n, m;
+        Scanner input = new Scanner(System.in);
+        n = input.nextInt();
+        m = input.nextInt();
+
+        System.out.println("Enter choice:");
+        int choice = input.nextInt();
+
+        switch (choice) {
+            case 1:
+                System.out.println(n + m);
+                System.out.println("You chose addition.");
+                break;
+
+            case 2:
+                System.out.println(n - m);
+                System.out.println("You chose subtraction.");
+                break;
+
+            case 3:
+                System.out.println(n * m);
+                System.out.println("You chose multiplication.");
+                break;
+
+            default:
+                System.out.println("Invalid choice.");
+        }
+    }
+}
diff --git a/Calculator1.class b/Calculator1.class
new file mode 100644
index 0000000..cb142ad
Binary files /dev/null and b/Calculator1.class differ
diff --git a/Calculator1.java b/Calculator1.java
new file mode 100644
index 0000000..f123a8d
--- /dev/null
+++ b/Calculator1.java
@@ -0,0 +1,49 @@
+import java.util.Scanner;
+
+public class Calculator1 {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        int choice;
+        do {
+            System.out.println("Choose an option:");
+            System.out.println("1. Add");
+            System.out.println("2. Subtract");
+            System.out.println("3. Exit");
+
+            choice = scanner.nextInt();
+
+            switch (choice) {
+                case 1:
+                    System.out.println("Enter two numbers for addition:");
+                    int num1 = scanner.nextInt();
+                    int num2 = scanner.nextInt();
+                    int sum = add(num1, num2);
+                    System.out.println("Result of addition: " + sum);
+                    break;
+                case 2:
+                    System.out.println("Enter two numbers for subtraction:");
+                    int num3 = scanner.nextInt();
+                    int num4 = scanner.nextInt();
+                    int difference = subtract(num3, num4);
+                    System.out.println("Result of subtraction: " + difference);
+                    break;
+                case 3:
+                    System.out.println("Exiting the program. ");
+                    break;
+                default:
+                    System.out.println("Invalid choice. Please enter 1, 2, or 3.");
+            }
+        } while (choice != 3);
+
+        scanner.close();
+    }
+
+    private static int add(int a,int b) {
+        return a + b;
+    }
+
+    private static int subtract(int a, int b) {
+        return a - b;
+    }
+}
\ No newline at end of file
diff --git a/Cat.class b/Cat.class
new file mode 100644
index 0000000..a885325
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