First Lab is done

src/Main.java

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+public class Main {
+
+    // Task 1: Method to return the difference between the largest and smallest values in an array
+    public static int maxDifference(int[] arr) {
+        if (arr.length == 0) {
+            throw new IllegalArgumentException("Array length must be at least 1");
+        }
+        int max = arr[0];
+        int min = arr[0];
+
+        for (int num : arr) {
+            if (num > max) {
+                max = num;
+            }
+            if (num < min) {
+                min = num;
+            }
+        }
+        return max - min;
+    }
+
+    // Task 2: Method to find and print the smallest and second smallest elements
+    public static void findTwoSmallest(int[] arr) {
+        if (arr.length < 2) {
+            throw new IllegalArgumentException("Array must have at least two elements");
+        }
+        int smallest = Integer.MAX_VALUE;
+        int secondSmallest = Integer.MAX_VALUE;
+
+        for (int num : arr) {
+            if (num < smallest) {
+                secondSmallest = smallest;
+                smallest = num;
+            } else if (num < secondSmallest && num != smallest) {
+                secondSmallest = num;
+            }
+        }
+        System.out.println("Smallest element: " + smallest);
+        System.out.println("Second smallest element: " + secondSmallest);
+    }
+
+    // Task 3: Method to calculate the expression x^2 + (4y/5 - x)^2
+    public static double calculateExpression(double x, double y) {
+        double part1 = Math.pow(x, 2); // x^2
+        double part2 = Math.pow((4 * y / 5 - x), 2); // (4y/5 - x)^2
+        return part1 + part2;
+    }
+
+    public static void main(String[] args) {
+        // Example usage for Task 1:
+        int[] array1 = {4, 9, 1, 32, 12};
+        System.out.println("Difference between max and min: " + maxDifference(array1));
+
+        // Example usage for Task 2:
+        int[] array2 = {7, 5, 9, 1, 6, 2};
+        findTwoSmallest(array2);
+
+        // Example usage for Task 3:
+        double x = 3.0;
+        double y = 2.0;
+        System.out.println("Result of the expression: " + calculateExpression(x, y));
+    }
+}