# kodek16/colang

A CO language compiler, designed for programming contests and olympiads.
Scala
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# colang - CO language compiler

CO is a language designed for use in programming olympiads and contests like IOI and ACM ICPC. It features a simple C-style syntax, opinionated algorithm-oriented standard library, C++ tier performance, and many small bits that make solving tasks easier and more fun.

colang translates CO source code into C source code, so you can use CO on every judge that accepts C or C++.

## Status

colang is in early development stage, so it can't do much yet. This section will be updated when most core language features will be implemented, so stay tuned!

## Building

If you still want to try it out right now, grab the source, install SBT, and prepare your build environment. You need two things to successfully build colang: CO standard library and GCC binary on your PATH.

### CO standard library

colang depends on the CO standard library that must be present at any of the following locations: ~/.colang-libs/, /usr/local/lib/colang, /usr/lib/colang, /lib/colang. The standard library is included in this repo (the stdlib directory), so the most simple and reliable installation method is creating a symlink from ~/.colang-libs/ to the stdlib directory. On Unix-like systems this can be done like this:

ln -s path/to/repo/stdlib ~/.colang-libs


On Windows, run cmd.exe as administrator and in your home directory (C:\Users\<you>\) execute

mklink /D .colang-libs\ path\to\repo\stdlib


### Assembly

Once you have GCC and CO stdlib ready, build the compiler with sbt assembly. It will produce an executable standalone JAR file under target/scala-2.11.

## Compiling and running programs

You can now compile and execute the solution to the A + B problem:

void main() {
int a, b
println(a + b)
}

The syntax is not final: a more convenient I/O interface will be eventually supported.

Let's go for a more fun example. At this point, you can already solve quadratic equations with CO:

double abs(double x) {
if (x >= 0.0) return x else return -x
}

double sqr(double x) {
return x * x
}

double EPS = 1.0e-9

//If we have no sqrt(), we can just write our own :)
double sqrt(double x) {
double r = 10.0

while (abs(r * r - x) > EPS) {
r = r - (sqr(r) - x) / (2.0 * r)
}

return r
}

void main() {
double a, b, c

double det = sqr(b) - 4.0 * a * c
if (det < 0.0) {
//Can't print strings yet :(
println(-1)
return
}

double r1 = (-b - sqrt(det)) / (2.0 * a)
double r2 = (-b + sqrt(det)) / (2.0 * a)

println(r1)
println(r2)
}

For the curious, the generated code looks like this.

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