Java Math.rint() method

The java.lang.Math.rint() is used to round the argument to nearest mathematical integer.

Syntax

Parameter

Return

It returns closest floating-point value to x that is equal to a mathematical integer.

If the argument is positive or negative number, this method will return the nearest value.
If two double values that are mathematical integers are equally close, this method will return integer value that is even.
If the argument is NaN or infinity or positive zero or negative zero, this method will return the argument value as a result.

Example 1

public class RintExample1
{
    public static void main(String[] args) 
    {
        double x = 81.68;
        // Input positive value, Output round the x
        System.out.println(Math.rint(x));
    }
}

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Output:

82.0

Example 2

public class RintExample2
{
    public static void main(String[] args) 
    {
        double x = -37.25;
        // Input negative zero, Output round the x 	
        System.out.println(Math.rint(x));
    }
}

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Output:

-37.0

Example 3

public class RintExample3
{
    public static void main(String[] args) 
    {
        double x = 80.5;
        double y = 79.5;
        // rounds upto 80 which is the nearest even double value	
        System.out.println(Math.rint(x));
        System.out.println(Math.rint(y));
    }
}

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Output:

80.0
80.0

Example 4

public class RintExample4
{
    public static void main(String[] args) 
    {
        double x = 1.0/0;
        // Input positive infinity, Output positive infinity 	
        System.out.println(Math.rint(x));
    }
}

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Output: