Change project structure to a Maven Java project + Refactor (#2816)

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

@@ -0,0 +1,31 @@
+package com.thealgorithms.maths;
+
+import java.util.Random;
+
+public class Ceil {
+
+    public static void main(String[] args) {
+        Random random = new Random();
+        for (int i = 1; i <= 1000; ++i) {
+            double randomNumber = random.nextDouble();
+            assert ceil(randomNumber) == Math.ceil(randomNumber);
+        }
+    }
+
+    /**
+     * Returns the smallest (closest to negative infinity)
+     *
+     * @param number the number
+     * @return the smallest (closest to negative infinity) of given
+     * {@code number}
+     */
+    public static double ceil(double number) {
+        if (number - (int) number == 0) {
+            return number;
+        } else if (number - (int) number > 0) {
+            return (int) (number + 1);
+        } else {
+            return (int) number;
+        }
+    }
+}