3X Column
A clever number-formatting subroutine right-aligns decimal values across three columns, using user-defined functions to round and pad output automatically.
DEF FN
Using DEF FN and FN
DEF FN and FN commands define and call functions for math operations, string manipulations, and Boolean logic evaluations in BASIC programming.
Mike’s Notebook: CLIP
One of the fundamental concepts of computer graphics programming is that of viewport clipping, or eliminating all lines of a display outside the screen. Type in PROGRAM #1 and run it to see what happens. Notice that when any line attempts to go beyond the screen bounds you get a “B Integer out of range”