Java – How to round floating point number to integer ?

Published on March 8, 2016 by abundantcode

Filed under Java

Last modified March 9, 2016

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Problem Statement

You need to round the floating-point numbers to integers in Java.

Solution

When you cast a floating value to integer in Java , the value gets truncated. For example , the value 7.8989 when casted to integer will become 7.

In order to round he floating-point numbers correctly , you can use the Math.round() method.

The Math.round method has a 2 overloaded forms.

The first one takes the double as input and returns long. The second one takes the float value and returns integer.

public class Main {

    public static void main(String[] args) {

        System.out.println("Abundantcode.com Java Tutorials");

        double input1 = 76.88967;
        long output1 = Math.round(input1);
        System.out.println("Long value is " + output1);

        int output2 = Math.round(output1);
        System.out.println("int value is " + output2);


    }
}

The output of the above program is

Abundantcode.com Java Tutorials

Long value is 77

int value is 77

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