Gotolang

Gotolang is an esoteric programming language in which the primary instruction is goto (as the name suggests).

if you were looking for GotoLang which was created first go here

Syntax

• gotolang programs are line-oriented. Each line contains one instruction. Comments start with #.

# Count from 0 to 4.
set i 0

label loop
lt i 5
if body
goto done

label body
print i
print "\n"
add i 1
goto loop

label done
halt

• Variables are created automatically and default to 0 when first read. Operands are either integer literals or variable names:

set x 10
add x 1
set y x

• Only string literals work for the print statement

print "Hello, World!"

Instructions

Control Flow

Instruction	Description
label <name>	defines a jump target
goto <label>	unconditionally jumps to label
if <label>	conditionally jumps to a label (the line before must contain the condition)
halt	stop the program

Conditions

Instruction	Description
eq <a>	evaluates to true if a == b
lt <a>	evaluates to true if a < b

Data Manipulation

Instruction	Description
set <operand>	sets a variable to a literal or another variable
add <operand>	adds an opperand to a variable
sub <operand>	subtracts an operand from a variable

Input and Output

Instruction	Description
print <operand>	prints operand to STDOUT
read	reads into var from STDIN

Notes

• Identifiers contain letters, digits, and underscores, and cannot start with a digit.
• Integers are signed 64-bit values.
• The comparison flag is overwritten by each eq or lt.
• if <label> means "if the current comparison flag is true, jump to <label>."
• Unknown labels, duplicate labels, and malformed instructions are reported as errors.

Examples

Factorial

print "Enter n: "
read n

set fact 1
set i 1

label loop
lt n i
if done

set old fact
set fact 0
set m 0
label multiply_loop
eq m i
if multiply_done
add fact old
add m 1
goto multiply_loop

label multiply_done
add i 1
goto loop

label done
print "n! = "
print fact
halt

Written by icitry

Brainfuck Interpeter

If you're not familiar with the language, see Brainfuck

Due to the limitations of Gotolang, the interpreter has the following restrictions and changes:

• The tape only has 10 cells
• Programs can be no longer than 29 characters long
• The program can only be in intergers

Convertions

Command	Integer Representation
>	0
<	1
+	2
-	3
.	4
,	5
[	6
]	7

Written by icitry

Disclaimer

I'm saving this to work on later i.e THIS PAGE IS UNDER CONSTRUCTION P.S this is my first page