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wojtek · (This post was last modified: 10-05-2016 08:59 PM by wojtek.)

Interesting. Probably a bug or "undocumented feature" :-)
You gave not the calculator name nor rom ver, I checked it on 50g ver 1.15 and got the same results.
The explanation is simple, two operators in << + * >> need 3 arguments. If you change 3 for 2 the calculator takes the 3rd list from the stack (it should not do it!) and gives some values instead of "argument missing" error message. What it is doing? perhaps only developers know.
If you change 3 for 2 and remove the 3rd list, or change 3 for 4 or 1 or other value the calculator gives an error message as it should.