V3i

V3i, an abbreviation for Variable 3 Input, is an esoteric programming language created by BowlingPizzaBall which has only three variables named x, y, and z.
Despite this, the language is somewhat powerful, having stuff like a wait function and the support for infinite loops.

Functions

Function	Definition	Arguments/Examples
def	Defines one of the 3 variables.	def <x,y, or z> <varcontent>
var	Calls one of the 3 variables.	var <x,y, or z>
+	Adds 2 numbers.	n+n
-	Subtracts 2 numbers.	n-n
*	Gives the product of 2 numbers.	n*n
/	Gives the quotient of 2 numbers.	/
sqrt	Gives the square root of a number.	sqrt n
%	Gives the mod of 2 numbers.	n%n
=	Checks if something is equal to something. Returns 1 if so, 0 if not.	6=4 (returns 0)
>	Checks if a number is greater than another. Returns 1 if so, 0 if not.	6>4 (returns 1)
<	Checks if a number is less than another. Returns 1 if so, 0 if not.	6<4 (returns 0)
print	Prints something.	print <"text"/number/variable>
if	If statement.	if <content> <condition> <content>
else	Else statement.	else <content>
loop	Starts a loop.	loop <timesToLoop> <contentToLoop>
iloop	Starts an infinite loop.	iloop <content to loop>
input	Halts execution until an input is received from the user.	None
wait	Waits for n milliseconds.	wait <ms>
#	Comment function.	# <comment> #
end	Ends execution. (optional)	None

Examples

Hello World

print "Hello, World!";

Truth Machine

if input = 0;
print "0"; end;
else;
iloop print "1";

Cat

print input;

Fibonacci

def x 1;
def y 1;
print 0;
print 1;
print 1;
iloop def x x+y print x def y y+x print y;

99 bottles of beer

def x 99;
loop 99;
if x = 1;
print "1 bottle of beer on the wall"
print "1 bottle of beer"
print "Take one down, pass it around"
print "No more bottles of beer on the wall"
else;
print x " bottles of beer on the wall";
print x " bottles of beer";
print "Take one down, pass it around";
def x x-1;
print x " bottles of beer on the wall";

Deadfish

def x 0;
iloop if input = o;
print x;
else if input = i;
def x x+1;
else if input = d;
def x x-1;
else if input = s;
def x x*x;
else; print "Invalid command";

Computational class

Language is Turing complete by reduction from Infinite GotoStart with 3 registers.
Program starts with:

iloop;

+(x) becomes:

def x x+1;

-(x) becomes:

def x x-1;

=(x:y) becomes:

def x y;

?(x=y>abc)xyz becomes:

if x=y;
abc;
xyz;
else;
xyz;

Interpreter

It will come soon, or at least when I fully understand python and its sys module.