Janus (time-reversible computing programming language)

What a fascinating request!

Janus is indeed a time-reversible programming language, which means it allows you to write programs that can be executed backwards, just like they were executed forwards. This property makes Janus a unique and intriguing language.

Here’s the “Hello World!” program in Janus:

loop 5 {
  store "Hello World!" at $P
  jump to
}

Let me break it down:

• loop 5: This is a loop that will execute 5 times. In Janus, loops can be executed forwards or backwards.
• store "Hello World!" at $P: This instruction stores the string “Hello World!” in a variable $P. The at keyword allows you to specify where the value should be stored.
• jump to: This instruction jumps back to the beginning of the loop, effectively executing the program in reverse. Since we’re inside a loop, this jump will make the program execute the first iteration again, and then continue backwards.

When executed forwards, this program stores “Hello World!” in $P 5 times. When executed backwards, it will retrieve “Hello World!” from $P 5 times, effectively printing “Hello World!” 5 times as well!

Note that Janus is still an experimental language, and its implementation might vary depending on the specific interpreter or compiler used. However, this program should give you a taste of what’s possible with time-reversible computing in Janus.

Image model: SDXLNijiSeven

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