Format double type in Java

Let’s say we have the following three values −

double val1 = 15.546; double val2 = 25.87; double val3 = Math.PI;

Let us now format these double-type numbers. Firstly, we are formatting Euler’s number with Math.exp(). After that, we have also evaluated log. The %.3f you can see here is what we used for formatting the numbers.

System.out.printf("exp(%.3f) = %.3f%n", val1, Math.exp(val1)); System.out.printf("log = %.3f%n", val1, Math.log(val1));

The following is an example where we have also shown other ways to format double in Java.

Example

 Live Demo

public class Demo {    public static void main(String args[]) {       double val1 = 15.546;       double val2 = 25.87;       double val3 = Math.PI;       System.out.format("%f%n", val1);       System.out.printf("exp(%.3f) = %.3f%n", val1, Math.exp(val1));       System.out.printf("log = %.3f%n", val1, Math.log(val1));       System.out.format("%3f%n", val2);       System.out.format("%+3f%n", val2);       System.out.format("%f%n", val3);       System.out.format("%.3f%n", val3);       System.out.printf("pow(%.3f, %.3f) = %.3f%n", val1, val2, Math.pow(val1, val2));    } }

Output

15.546000 exp(15.546) = 5643415.357 log = 15.546 25.870000 +25.870000 3.141593 3.142 pow(15.546, 25.870) = 6716991850252629000000000000000.000