Ada is a programming language with a long history designed to support high quality software development especially for safety and secure applications such as avionics. SPARK is a version of Ada ...

In this case we want the Ada.Text_IO package, as it contains the standard output routines like Put_Line. Note that since Ada is case-insensitive, we can type all of those names in lower-case as well.

Within Ada an advocated approach has been to use protected objects and barriers within entries, which provides language-level synchronization between tasks.