Fit

Fit is an esoteric programming language by User:Madk which uses numbers in base 5 (termed 'fits') to compute things. Each fit contains a number between and including -2 through +2.

Commands
+	rotate current fit digit; -2 → -1; -1 → 0; 0 → 1; 1 → 2; 2 → -2 -	rotate fit backwards ~	negate fit (	jump past the corresponding ) if the current cell = 0 )	jump back to matching ( if the current cell is ≠ 0 {	jump past matching } if the cell is ≥ 0 }	jump back to { if the cell is < 0 [	jump past matching ] if the cell is ≤ 0 ]	jump back to [ if the cell is > 0 /	jump past matching \ if the cell is ≠ 0 \	jump back to / if the cell is = 0 ?	skip the following instruction if the current cell is = 0 !	skip the following instruction if the current cell is ≠ 0 ^	skip the following instruction if the current cell is > 0 v	skip the following instruction if the current cell is < 0 =	destroy the current cell, following cell takes place under the pointer and all following cells are shifted left once to fill the gap <	move cell pointer left >	move cell pointer right _	set the ASCII byte counter to 0 ,	add the current ternary cell to the ASCII byte counter ;	output the ASCII byte counter, which is always 59 (the ASCII value for the character ;) at program start n	output a newline .	output the number under the pointer :	get input for the number under the pointer
 * 1) 	begin/end comment

Hello, world!
++,,,,,,-,;_+,,,,,,'+,-'-,;,+,,,;;,-,;_+,,,,';_,';''+,,,,+,;-,,,,;-,-,;++,,,;,,,,;_-,'-,;

Cat
+[>:.n<]

Quine
;

External resources
Download Fit interpreter