Quadrilateral.md

Quadrilateral

Template

. . . . . And so on
. . . . . And so on
. . . . . And so on
. . . . . And so on

Cat

> . ? ! \
. . . . .
. . _ . .

order of operations.

> sets the direction, eastward.

. is a no-op

? requests a char input and pushes to stack.

! pops the top value of Stack and pushes character representation.

\ "deflects" the programs pointer, now facing southwestward.

. is a no-op.

_ is like an "angle of incidence-angle of reflection" operator. The pointer is now northwestward.

. is a no-op.

> does the same as the starting position

Direction pointers.

/\_| reflect the direction of the pointer, while <>v^ literally state it. ʌ may be used instead of ^, but is harder to type.

examples.

The number 0-9 are used to represent order.

0 1 2 v
v 4 3 <
> 5 6 v
v 8 7 <
> 9 . .

0 1 2 \
. . 3 .
. 4 . .
| . . .
. 5 . .
. . 6 .
. . . |
. . 7 .
. 8 . .
9 . . .

Number^2

This program squares a number, prints the result, then starts again.

> ¿ & x \
. . . ! .
. . _ . .

Character commands.

Letter/Command	Function
?	Take character input and push to stack
!	Pop the Stack and print the character
¿	Take alphanumerical input and push to stack
¡	Pop the stack and print the number
#	Flip the top two stack items
&	Pop, then push the value twice
=	Pop twice, and if equal push 1, else 0
%	Pop twice, do first popped modulo second popped and Push to stack
0-9	Push the relative number to the stack
+	Pop twice, add and then push result
-	Pop twice, push first popped minus second popped
*	Pop twice, multiply, push to stack
÷ or :, mainly :	Pop twice, divide first popped by second popped, push to stack
$	Pop the Stack, then do nothing
@	End the program elsewhere than a column or row overflow
[	Like brainfuck [, unless the instruction pointer is in some way facing east, then it is equivalent to brainfuck's ]
]	Like brainfuck ], unless the instruction pointer is in some way facing east, then it is equivalent to brainfuck's [
u	Like brainfuck [ if instruction pointer is some way facing south, brainfuck ], otherwise it is brainfuck's ]
n	Like brainfuck ] if instruction pointer is some way facing south, brainfuck [, otherwise it is brainfuck's [
"	Flip the stack
'	Roll the top item of stack to the bottom
;	Only at column 1. Comments the line
~	Pop twice, then push a random number between those two including both ends

Trying some more.

So with that knowledge. Let's make a program to print a white space.

3 5 * 2 * 2 + !

Or more creatively:

3 5 * 2 \
. . . * .
. . 2 . .
. > + ! .

Or almost unreadable:

3 5 v . .
. . * . .
. . > 2 \
v 2 * < .
+ . . . .
> ! . . .

Explained

Command	Function	Stack (-->)
3	Push 3	3
5	Push 5	3, 5
*	Multiply	15
2	Push 2	15, 2
*	Multiply	30
2	Push 2	30, 2
+	Add	32
!	Print