Java Math.rint()用法及代碼示例

public static double rint(double x)

x= a double value

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

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));
    }
}

82.0

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));
    }
}

-37.0

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));
    }
}

80.0
80.0

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));
    }
}

Infinity