Java Math.ceil() method

The java.lang.Math.ceil () is used to find the smallest integer value that is greater than or equal to the argument or mathematical integer.

Syntax

Parameter

Return

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

If the argument is positive or negative double value, this method will return the ceil value.
If the argument is NaN, this method will return same argument.
If the argument is Infinity, this method will return Infinity with the same sign as the argument.
If the argument is positive or negative Zero, this method will return Zero with same sign as the argument.
If the argument is less than Zero but greater than -1.0, this method will return Negative Zero as output.

Example 1

public class CeilExample1
{
    public static void main(String[] args) 
    {
        double x = 83.56;
        // Input positive value, Output ceil value of x 
        System.out.println(Math.ceil(x));
    }
}

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Output:

84.0

Example 2

public class CeilExample2
{
    public static void main(String[] args) 
    {
        double x = -94.73;
        // Input negative value, Output ceil value of x
        System.out.println(Math.ceil(x));
    }
}

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Output:

-94.0

Example 3

public class CeilExample3
{
    public static void main(String[] args) 
    {
        double x = -1.0 / 0;
        // Input negative infinity, Output negative infinity
        System.out.println(Math.ceil(x));
    }
}

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Output:

-Infinity

Example 4

public class CeilExample4
{
    public static void main(String[] args) 
    {
        double x = 0.0;
        // Input positive zero, Output positive zero
        System.out.println(Math.ceil(x));
    }
}

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Output:

0.0

Example 5

public class CeilExample5
{
    public static void main(String[] args) 
    {
        double x = -0.25;
        // Input less than zero but greater than -1.0, Output negative zero
        System.out.println(Math.ceil(x));
    }
}

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Output: