Format floating point number in Java

Java 8 Object Oriented Programming Programming

Let’s say we have the following two values.

double val1 = 20.932;
double val2 = 11.67;

Let us now format these floating-point numbers. Firstly, we are formatting euler’s number withMath.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 float in Java.

Example

Live Demo

public class Demo {
   public static void main(String args[]) {
      double val1 = 20.932;
      double val2 = 11.67;
      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.printf("pow(%.3f, %.3f) = %.3f%n", val1, val2, Math.pow(val1, val2));
   }
}

Output

20.932000
exp(20.932) = 1232117412.659
log = 20.932
11.670000
+11.670000
pow(20.932, 11.670) = 2593350237975675.500

Samual Sam

Published on 11-Dec-2018 05:53:07

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