I found the reason why using I,J,K variables with loop on the old FORTRAN reference. FORTRAN has 2 types variables floating and fixed number. The type is fixed when the variable starts a letter I to N!

Programmer's reference manual Fortran (IBM704) - The Fortran Company
I found a IBM 711IBM 704 on the movie "Hidden Figures" (review@ja)

FORTRAN is the origin computer language according from the Computer History Museum. BASIC came from FORTRAN also.

Let's play with the LOOP on IchigoJam BASIC. I added a print about the the loop using FOR-NEXT command.

IchigoJam print

Please join us to make prints to learn BASIC!
"IchigoJam on GitHub"

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