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About Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Round float and double numbers

With this example we are going to demonstrate how to round float and double numbers using round() method of Math. The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions. In short, to round float and double numbers you should:

  • Use round(float a) method to get the closest int to the argument, with ties rounding up.
  • Use round(double a)method to get the closest long to the argument, with ties rounding up.

Let’s take a look at the code snippet that follows:  

package com.javacodegeeks.snippets.core;

public class RoundFloatDouble {

	public static void main(String args[]) {

		// All the examples return the closest int/long to
		// the argument of round static method

		System.out.println(Math.round(76.3));

		System.out.println(Math.round(76.7));

		System.out.println(Math.round(-53.4));

		System.out.println(Math.round(-53.6));

	}
}

Output:

76
77
-53
-54

  
This was an example of how to round float and double numbers using round() method of Math in Java.

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