style: include ICAST_IDIV_CAST_TO_DOUBLE (#6121)

Author: vil02

spotbugs-exclude.xml

@@ -41,9 +41,6 @@
     <Match>
         <Bug pattern="INT_BAD_REM_BY_1" />
     </Match>
-    <Match>
-        <Bug pattern="ICAST_IDIV_CAST_TO_DOUBLE" />
-    </Match>
     <Match>
         <Bug pattern="FE_FLOATING_POINT_EQUALITY" />
     </Match>

src/main/java/com/thealgorithms/maths/Average.java

@@ -37,14 +37,14 @@ public static double average(double[] numbers) {
      * @return the average of the given numbers
      * @throws IllegalArgumentException if the input array is {@code null} or empty
      */
-    public static double average(int[] numbers) {
+    public static long average(int[] numbers) {
         if (numbers == null || numbers.length == 0) {
             throw new IllegalArgumentException("Numbers array cannot be empty or null");
         }
         long sum = 0;
         for (int number : numbers) {
             sum += number;
         }
-        return (double) (sum / numbers.length);
+        return sum / numbers.length;
     }
 }

src/main/java/com/thealgorithms/others/KochSnowflake.java

@@ -105,7 +105,7 @@ public static BufferedImage getKochSnowflake(int imageWidth, int steps) {
         double offsetX = imageWidth / 10.;
         double offsetY = imageWidth / 3.7;
         Vector2 vector1 = new Vector2(offsetX, offsetY);
-        Vector2 vector2 = new Vector2(imageWidth / 2, Math.sin(Math.PI / 3) * imageWidth * 0.8 + offsetY);
+        Vector2 vector2 = new Vector2(imageWidth / 2.0, Math.sin(Math.PI / 3.0) * imageWidth * 0.8 + offsetY);
         Vector2 vector3 = new Vector2(imageWidth - offsetX, offsetY);
         ArrayList<Vector2> initialVectors = new ArrayList<Vector2>();
         initialVectors.add(vector1);