What does the 3D19.12 I/O format mean?

Question

Java

What does the 3D19.12 I/O format mean? Give an example of such a number :)

Answer 1

This is Fortran. 3D19.12 - 3 double precision numbers, occupying 19 characters, of which 12 are fractional parts. Here are some examples at the end. Here in Russian.

Answer 2

This is exponential notation, aka "scientific representation"