Gridify

Gridify is an esolang by User:Cordership based on Befunge.

Instructions

Instruction	Definition
>	Move code pointer right.
<	Move code pointer left.
^	Move code pointer up.
v	Move code pointer down.
~	Input a character and push it into the stack.
&	Input an integer and push it into the stack.
.	Pop the number at the top of the stack, output it as an integer.
,	Pop the number at the top of the stack, output it as an ASCII character.
_	Horizontal If: Pop top of stack, go right if value=0, otherwise go left.
|	Vertical If: Pop top of stack, go down if value=0, otherwise go up.
`	Horizontal If reverse.
x	Vertical If reverse.
?	All-directions If: Pop top of stack, if value=1 go up, if value=2 go right, if value=3 go down, if value=4 go left.
R	Go in a random direction.
0-9	Push the corresponding integer into the stack.
"[string]"	Push string into the stack.
@	Halt program.
:	Pop top of the stack and store it in the code pointer.
;	Push the code pointer's contents into the stack.
+	Pop the two topmost numbers a and b in the stack, push the result of a+b.
-	Pop the two topmost numbers a and b in the stack, push the result of b-a.
*	Pop the two topmost numbers a and b in the stack, push the result of a*b.
/	Pop the two topmost numbers a and b in the stack, push the result of the integer division b/a.
%	Pop the two topmost numbers a and b in the stack, push the remainder of the integer division a/b.
h	Pop the two topmost numbers a and b in the stack, push the result of b^a.
#	Discard the code pointer's contents.
/text/	One-line comment.
$	Pop top of the stack, duplicate it: one copy gets pushed back into the stack, the other goes into the code pointer.
w	Pop the code pointer's contents, duplicate it: one copy goes into the stack, the other stays in the code pointer.
k	Pop the two topmost numbers a and b in the stack, push a into the stack b times.
n	Pop all of the stack's contents and print them from top to bottom as integers.
r	Pop all of the stack's contents and print them from top to bottom as ASCII characters.
o	Increment the code pointer's contents by 1.
a	Duplicate top stack value.
p	Skip the command right ahead of the code pointer in its direction.
\	Swap top stack values.
z	Move the code pointer in a random direction.
b	Pop top of stack and discard.
G	A "get" call (a way to retrieve data in storage). Pop two values y and x, then push the ASCII value of the character at that position in the program. If (x,y) is out of bounds, push 0
P	A "put" call (a way to store a value for later use). Pop three values y, x and v, then change the character at the position (x,y) in the program to the character with ASCII value v
g	Greater than: Pop two values a and b, then push 1 if b>a, otherwise zero.
L	Less than: Pop two values a and b, then push 1 if b<a, otherwise zero.
[	Rotate the top three items on the stack clockwise.
]	Rotate the top three items on the stack counterclockwise.
m	Mirror, reverse current direction.

1. Everything else is NOP.

Programs

Hello, World!

"!dlroW ,olleH">,v
               ^ <

Hello, World! 2

89*!54*5*1+!34*9*!34*9*!66*1+3*!56+4*!25h!47*1+3*!66*1+3*!66*2+3*!34*9*!54*5*!65*3*!@

Hello, World! 3

"!dlroW ,olleH"r@

One time cat

,.

Cat program

,>.,v
 ^  <

Truth-machine

, >v
   v
v1<_0.@
>.^

A+B problem

&&+.

Looping counter

67*0:>owkr52*,v
     ^        <

4-function calculator

&&&v @
   p .
   >+^
  v?-^
  /*
  >> ^