Java floor() Method: Usage and Examples

Description

This java tutorial tells how to use the floor(double) method of Math class under java.lang package. This method returns the largest (closest to positive infinity) double value that is less than or equal to the argument and is equal to a mathematical integer

The method floor gives the largest integer that is less than or equal to the argument.

Syntax

This method has the following variants ?

double floor(double d)
double floor(float f)

Parameters

Here is the detail of parameters ?

• A double or float primitive data type.

Return Value

The floor(double a) method simply returns the largest double value that is less than or equal to the argument and is equal to an integer. Special cases:

• If the argument value is already equal to a mathematical integer, then the result is the same as the argument.
• If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.

This method returns the largest integer that is less than or equal to the argument. Returned as a double.

Example

public class FloorMethod {

   public static void main(String args[]) {
      double d = -120.675;
      float f = -70;

      System.out.println(Math.floor(d));
      System.out.println(Math.floor(f));

      System.out.println(Math.ceil(d));
      System.out.println(Math.ceil(f));
   }
}

Output

-121.0
-70.0
-120.0
-70.0
Press any key to continue . . .

Example

This java example source code demonstrates the use of floor(double a) method of Math class. Basically we just get the floor value of a double variable coming from the user input.

import static java.lang.System.*;

import java.util.Scanner;

/*
 * This example source code demonstrates the use of
 * floor(double a) method of Math class
 * Get the floor value of the user input
 */

public class MathFloor {

	public static void main(String[] args) {
		// ask for user input
		out.print("Enter a value:");
		Scanner scan = new Scanner(System.in);
		// use scanner to get user console input
		double value = scan.nextDouble();
		// get the ceiling of a value
		double floorValue = Math.floor(value);
		out.println("floor of "+value+" = "+floorValue);
		// close the scanner object to avoid memory leak
		scan.close();

	}

}

Output

Running the abs(double a) method example source code of Math class will give you the following output

Enter a value:156.235
floor of 156.235 = 156.0
Press any key to continue . . .

Find floor value of a number using Math.floor

/*
  Find floor value of a number using Math.floor
  This java example shows how to find a floor value of a number using floor method
  of Java Math class. floor method returns the largest interger which is not grater
  than the value.
*/

public class FindFloorValueExample {

  public static void main(String[] args) {

    /*
     * To find a floor value, use
     * static double floor(double d) method of Math class.
     *
     * It returns a largest integer which is not grater than the argument value.
     */

    //Returns the same value
    System.out.println(Math.floor(70));

    //returns largest integer which is not less than 30.1, i.e. 30
    System.out.println(Math.floor(30.1));

    //returns largest integer which is not less than 15.5, i.e. 15
    System.out.println(Math.floor(15.5));

    //in this case it would be -40
    System.out.println(Math.floor(-40));

    //it returns -43.
    System.out.println(Math.floor(-42.4));

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

  }
}

Output

70.0
30.0
15.0
-40.0
-43.0
0.0
Press any key to continue . . .