Java.lang.Math.ceil() Method

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Description

The java.lang.Math.ceil(double a) returns the smallest (closest to negative infinity) double value that is greater than or equal to the argument and is equal to a mathematical integer. Special cases −

• If the argument value is already equal to a mathematical integer, then the result is the same as the argument.

• If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.

• If the argument value is less than zero but greater than -1.0, then the result is negative zero.

Note that the value of Math.ceil(x) is exactly the value of -Math.floor(-x).

Declaration

Following is the declaration for java.lang.Math.ceil() method

public static double ceil(double a)

Parameters

a − a value.

Return Value

This method returns the smallest (closest to negative infinity) floating-point value that is greater than or equal to the argument and is equal to a mathematical integer.

Exception

NA

Example

The following example shows the usage of lang.Math.ceil() method.

package com.tutorialspoint;

import java.lang.*;

public class MathDemo {

   public static void main(String[] args) {

      // get two double numbers
      double x = 125.9;
      double y = 0.4873;
   
      // call ceal for these these numbers
      System.out.println("Math.ceil(" + x + ")=" + Math.ceil(x));
      System.out.println("Math.ceil(" + y + ")=" + Math.ceil(y));
      System.out.println("Math.ceil(-0.65)=" + Math.ceil(-0.65));
   }
}

Let us compile and run the above program, this will produce the following result −

Math.ceil(125.9)=126.0
Math.ceil(0.4873)=1.0
Math.ceil(-0.65)=-0.0