Round down a number using floor method of Java Math class

Java Math floor method example shows how to round down a number using the floor method of the Java Math class.

How to round down a number using the floor method of Math class?

We can use the floor method of Java Math class to round down a number.

1	public static double floor(double d)

This method returns the largest double number which is equal to or less than the argument and is equal to an integer.

package com.javacodeexamples.mathexamples;

public class RoundDownNumberExample {

public static void main(String[] args){

System.out.println("Round down a number example");

//returns 5.0

System.out.println( Math.floor(5.1) );

//returns 5.0

System.out.println( Math.floor(5.5) );

//returns 5.0

System.out.println( Math.floor(5.99) );

//returns -6.0

System.out.println( Math.floor(-5.01) );

//returns -6.0

System.out.println( Math.floor(-5.99) );

//returns 0.0

System.out.println( Math.floor(0.99) );

//returns 0.0

System.out.println( Math.floor(0.01) );

//returns 0.0

System.out.println( Math.floor(0) );

//returns 0.0

System.out.println( Math.floor(-0) );

}

Output

Round down a number example

5.0

-6.0

0.0

Please note that -5.01 and -5.99 return -6 because -6 is the smallest integer less than both of them.

Please, also not that the floor method returns a double. You may need to cast it to an appropriate data type from the double value.

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