Ceil.java

package com.thealgorithms.maths;

/**
 * Utility class to compute the ceiling of a given number.
 */
public final class Ceil {

 private Ceil() {
 }

 /**
 * Returns the smallest double value that is greater than or equal to the input.
 * Equivalent to mathematical ⌈x⌉ (ceiling function).
 *
 * @param number the number to ceil
 * @return the smallest double greater than or equal to {@code number}
 */
 public static double ceil(double number) {
 if (Double.isNaN(number) || Double.isInfinite(number) || number == 0.0 || number < Integer.MIN_VALUE || number > Integer.MAX_VALUE) {
 return number;
 }

 if (number < 0.0 && number > -1.0) {
 return -0.0;
 }

 long intPart = (long) number;
 if (number > 0 && number != intPart) {
 return intPart + 1.0;
 } else {
 return intPart;
 }
 }
}