JavaAlgorithms/Maths/Ceil.java

package 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;
    }
  }
}