done

src/Main.java

@@ -0,0 +1,47 @@
+public class Main {
+
+    public static void main(String[] args) {
+        int array[] = {1, 503, 4, 1900};
+        int max = array[0];
+        for (int i = 1; i < array.length; i++) {
+            if (array[i] > max) {
+                max = array[i];
+            }
+
+        }
+        System.out.println("Max number is " + max);
+        int min = array[0];
+        for (int i = 1; i < array.length; i++) {
+            if (array[i] < min) {
+                min = array[i];
+            }
+        }
+        System.out.println("Min number is " + min);
+        int difference = (max - min);
+        System.out.println("The difference is "+difference);
+        int smallest1 = Integer.MAX_VALUE;
+        int smallest2 = Integer.MAX_VALUE;
+        for (int i = 0; i < array.length; i++) {
+            if (array[i] < smallest1) {
+                smallest2 = smallest1;
+                smallest1 = array[i];
+            } else if (array[i] < smallest2 && array[i] != smallest1)
+                smallest2 = array[i];
+
+        }
+        System.out.println("The second smallest number is "+smallest2);
+
+
+        double x = 2;
+        double y = 3;
+        double d = (4 * y / 5 - x);
+        double result = x * x + d * d;
+        System.out.println("The result of 3rd task is: " + result);
+
+
+
+
+    }
+}
+
+