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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 [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 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, 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 ## Usage
@ -47,6 +48,23 @@ You can also define your own functions and variables:
= 6 = 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: Symbolic algebra is done in the following manner:
```scl ```scl