Java Math Round() - Programiz

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The round() method rounds the specified value to the closest int or long value and returns it. That is, 3.87 is rounded to 4 and 3.24 is rounded to 3.

Example

class Main { public static void main(String[] args) { double a = 3.87; System.out.println(Math.round(a)); } } // Output: 4

Syntax of Math.round()

The syntax of the round() method is:

Math.round(value)

Here, round() is a static method. Hence, we are accessing the method using the class name, Math.

round() Parameters

The round() method takes a single parameter.

  • value - number which is to be rounded

Note: The data type of the value should be either float or double.

round() Return Value

  • returns the int value if the argument is float
  • returns the long value if the argument is double

The round() method:

  • rounds upward if the value after the decimal is greater than or equal to 5 1.5 => 2 1.7 => 2
  • rounds downward if the value after the decimal is smaller than 5 1.3 => 1

Example 1: Java Math.round() with double

class Main { public static void main(String[] args) { // Math.round() method // value greater than 5 after decimal double a = 1.878; System.out.println(Math.round(a)); // 2 // value equals to 5 after decimal double b = 1.5; System.out.println(Math.round(b)); // 2 // value less than 5 after decimal double c = 1.34; System.out.println(Math.round(c)); // 1 } }

Example 2: Java Math.round() with float

class Main { public static void main(String[] args) { // Math.round() method // value greater than 5 after decimal float a = 3.78f; System.out.println(Math.round(a)); // 4 // value equals to 5 after decimal float b = 3.5f; System.out.println(Math.round(b)); // 4 // value less than 5 after decimal float c = 3.44f; System.out.println(Math.round(c)); // 3 } }

Also Read:

  • Java Math.floor()
  • Java Math.ceil()

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