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Updated README for new scoping system.

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Jacob Signorovitch 2025-04-14 09:07:28 -04:00
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README.md
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@ -6,7 +6,8 @@ SCL aims to be a human-friendly Computer Algebra System (CAS) inspired by
[maxima](https://maxima.sourceforge.io/) that feels like writing on paper. In
its current state, SCL can be used as a basic 4-function calculator with order
of operations and local variables. The codebase is about 1,400 lines of C,
including a parser, interpreter, and runtime.
including a parser, interpreter, and runtime. It uses a linked environment
scoping model.
## Usage
@ -47,6 +48,23 @@ You can also define your own functions and variables:
= 6
```
As SCL uses a linked environment model for scope, arguments are passed by
reference by default. If you would like to pass by value (i.e., a copy) you may
use the syntax:
```scl
> f(x) = x = 1
> n = 4
> f($n) # Pass a copy of n.
= 1
> n
= 4
> f(n) # Pass a reference to n.
= 1
> n
> 1
```
Symbolic algebra is done in the following manner:
```scl