Java Math.floor()用法及代碼示例

public static double floor(double a)

x= a value

This method returns largest floating-point value that is less than or equal 
to the argument and is equal to a mathematical integer of a double value.

public class FloorExample1
{
    public static void main(String[] args) 
    {
        double x = 94.69;
        // Input positive value, Output floor value of x
        System.out.println(Math.floor(x));
    }
}

94.0

public class FloorExample2
{
    public static void main(String[] args) 
    {
        double x = -39.28;
        // Input negative value, Output floor value of x
        System.out.println(Math.floor(x));
    }
}

-40.0

public class FloorExample3
{
    public static void main(String[] args) 
    {
        double x = 0.0;
        // Input positive zero, Output positive zero 
        System.out.println(Math.floor(x));
    }
}

0.0

public class FloorExample4
{
    public static void main(String[] args) 
    {
        double x = -7.0 / 0;
        // Input negative infinity, Output negative infinity
        System.out.println(Math.floor(x));
    }
}

-Infinity