Format double type in Java

Java 8Object Oriented ProgrammingProgramming

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
raja
Published on 11-Dec-2018 06:22:21
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