# C@++

C@++ is an extension of C@ by User:BoundedBeans, made for simple text algorithms.

## Commands

: duplicate / swap $ discard . print # rot % over & tuck ] Makes the next command operate on the stack as groups of two. This can be stacked, for example, ]: is like forth's 2DUP, while ]]: would be like a 3DUP @ Pop digits to make a base-10 number n until the top of the stack is not a digit (don't pop the non-digit), roll the top element n places down ~c Push the character c to the stack, ignoring its meaning [ push the stack depth to the stack as decimal digits + A command disambiguator +| Reserved for extensions, can be another disambiguator or just take stuff from the stack to determine what to do +@ Like @, but pops an additional character before rolling, so that a digit can be rolled +[ Push (the stack depth) - 1 to the stack as decimal digits (to work with +@ for rolling the entire stack) +A Pop two series of digits a and b, each terminated by an underscore, pushes a number of a similar format representing a + b +B like +A but pushes a - b +C like +A but pushes a * b +D like +A but pushes a / b +E like +A but pushes a modulo b +_ Pops a series of digits x, terminated by an underscore. Breaks out of the x innermost loops currently executing. Anything else: push to the stack.

Loops are also supported to run as long as the top of the stack is not a certain character. This syntax is XCLX, where L is the loop contents, C is the character to check against, and X's are the loop brackets. Loop brackets with inside depth of n are encoded as Unicode character #(8239 + n), and cannot be greater than #8286, so the loop brackets, from outermost to innermost, are:

‰ ‱ ′ ″ ‴ ‵ ‶ ‷ ‸ ‹ › ※ ‼ ‽ ‾ ‿ ⁀ ⁁ ⁂ ⁃ ⁄ ⁅ ⁆ ⁇ ⁈ ⁉ ⁊ ⁋ ⁌ ⁍ ⁎ ⁏ ⁐ ⁑ ⁒ ⁓ ⁔ ⁕ ⁖ ⁗ ⁘ ⁙ ⁚ ⁛ ⁜ ⁝ ⁞

Prefixing the loop brackets with `+.`

inverts the condition so they run as long as the top of the stack is a certain character.

## Examples

### Hello, world!

H.e.l:..o.,. .w.o.r.l.d.!.

Technically doesn't save any bytes over the following but is cooler for showing off duplication.

H.e.l.l.o.,. .w.o.r.l.d.!.

### Truth-machine

Since C@++ only takes in a string of input, it can't be interactive, therefore the input string should be 1 or 0.

+.‰1:.+.‰+.‰0._1+_+.‰