!/*

!/*

Paradigm(s)	Imperative
Designed by	User:TenBillionPlusOne
Appeared in	2025
Computational class	Total
Reference implementation	Unimplemented
File extension(s)	.islst

!/* or islst is a total language that is . It has three numeric operations: incrementation, division by two and multiplication by three.

Memory

It has one floating-point accumulator, sometimes referred to as x. Digit is a natural number from 1 to 3.

Instructions

Each instruction can be an initial, a command or an operand:

Caption text

Symbol	Initial	Command	Operand
!	Set x to 1.	Increment x.	A + B
/	Set x to 2.	Divide x by 2.	A / B
*	Set x to 3.	Multiply x by 3.	A * B
^	Set x to a digit from input.	Set x to x X digit from input.	-
?	Set x to a random digit.	Set x to x X random number.	-
_	-	Remove the fractional part of x.	-
&	-	Print x as a number.	-
$	-	Print x as an ASCII character.	-

( X is the next instruction, which is treated as operand. )

An instruction is an initial if it's the first instruction of the code. It initializes the value of the accumulator. An instruction is an operand if it's immediately after ^ or ?. It isn't executed.

Error handling

!/* is very strict when it comes to error handling. Every error is displayed as CRITICAL ERROR.

In the following cases the program reports an error:

• Non-instruction non-whitespace character found.
• Unallowed initial found.
• Unallowed operand found.
• No operand found.
• The program is empty.
• A character is printed when x mod 1 ≠ 0.
• A character is printed when x < 0.
• A character is printed when x > 255.

Examples

Hello world

*****//++++++++++++_$
**///+++++++++++++++++++_$
+++++++$$
+++$
*///+++_$
/++++++++++$
***///+++++++++++_$
*//++++++++++++++++++++++_$
+++$
*//+++++++++++++++++++++++_$
***/////+++++++++_$
//++++++++_$

Without whitespace:

*****//++++++++++++_$**///+++++++++++++++++++_$+++++++$$+++$*///+++_$/++++++++++$***///+++++++++++_$*//++++++++++++++++++++++_$+++$*//+++++++++++++++++++++++_$***/////+++++++++_$//++++++++_$

Quine

CRITICAL ERROR

Cat program

^&

Works only if the input is 1, 2 or 3.