KLC Lang

KLC (pronounced “calc”) is a simple toy programming language for basic math, created to study programming language design and development.

Repository Try it online

Why?

KLC was created primarily for fun and learning design and development of programming languages, and secondarily for daily math - calculus that requires conversions and a bit more than what calculator apps usually provides.

Usage

You can evaluate any expression inline by using quotes '<expression>', prefer single quotes because bash may interpolate double quotes:

$ klc '1 + 2'
3

$ klc 'fn(x) = x*2; fn(4)'
8

Alternatively, you can execute from file:

$ klcc file.klc
1

If you run klc without any arguments, you access the REPL, an interactive shell where you can test your commands.

How does it looks?

-- Comments are like these and can be used as documentation.
my_constant = 10
help(my_constant) -- will print 'Comments are like these and can be used as documentation.'

-- You can create variables
a = 1
b = 2
c = a + b

-- You can create functions using pattern matching
fib(0) = 0
fib(1) = 1
fib(x) = fib(x-1) + fib(x-2)

-- You can use the metrics system
distance = 2.5km to m -- converts 2.5 kilometers to meters
size = 40321MB to GB -- convert 40321 megabytes to gigabytes

-- Arithmetic Operators:
5+10 -- add
5-10 -- sub
5*10 -- mul
5/10 -- div
5^10 -- pow
5%10 -- mod

-- Relational Operators:
5 == 10 -- eq
5 != 10 -- neq
5 < 10  -- lt
5 <= 10 -- lte
5 > 10  -- gt
5 >= 10 -- gte

-- Logical Operators:
!1      -- not
0 and 1
0 or 1