RSC is a handwritten scientific calculator for turning an equation inside a string into a result. RSC is designed to be very lightweight and have as few dependencies as possible. It has the goal of just doing a single thing really well, and enabling anyone to extend it with more features.

RSC is also designed with the goal to not become bloated software. RSC will not receive frequent updates, but that does not mean it is old or unmaintained. That being said, RSC may still receive internal updates with relation to speed or resource usage.

The abbreviation can be interpreted in two majorly different ways:

• Rust Scientific Calculations library
• Rust Scientific Calculator

Obtaining RSC

If you would like to install RSC as a program onto your computer, you can either build the package or download it from the releases. More information here.

Size

RSC is ~350 lines of code. Executable RSC is about 387KiB debug; 266KiB release (on Windows).

Performance

RSC computes next to instantaneously, even with debug builds. The following output is the time (in nanoseconds) the different operations take to process sqrt((6.1--2.22)^2 + (-24-10.5)^2), where "bench_eval" is all of them at once. More info at lib.rs.

PS C:\Users\Luke\Documents\Projects\rsc\target\release> cargo bench
    Finished release [optimized] target(s) in 0.01s
     Running deps\rsc-d36a195311b11bb0.exe

running 4 tests
test tests::bench_compute  ... bench:         174 ns/iter (+/- 30)
test tests::bench_eval     ... bench:       5,678 ns/iter (+/- 300)
test tests::bench_parse    ... bench:       1,480 ns/iter (+/- 149)
test tests::bench_tokenize ... bench:       3,774 ns/iter (+/- 352)
...

Stability

RSC will not have any major changes to its syntax. It will remain to be consistent for a long time. It is up to forkers to make different tastes of RSC. It will also forever keep the same open-source permissions.

License

RSC is MIT licensed. RSC will always remain free to modify and use without attribution.

Example

PS C:\Users\lukew> rsc
>2+3*4
14
>2+3(4)
14
>(3)(4)
12
>sqrt 4
2
>sqrt(4)
2
>sqrt 4 + 2
4
>sin(6.5/9.7)
0.6210667900937665
>sin cos tan 2
-0.5449592372801408

Debug

RSC can be run with the ast flag and show the internal expression that was created by the parser. This is most commonly used for entertainment purposes 😛.

PS C:\Users\lukew> rsc ast
>pi*2^2
BinOp(
    Star,
    Constant(
        3.141592653589793
    ),
    Pow(
        Constant(
            2.0
        ),
        Constant(
            2.0
        )
    )
)
12.566370614359172

Errors

PS C:\Users\lukew> rsc
>oops
Lexer error: InvalidIdentifier("oops")
>3.3.1
Lexer error: InvalidNumber("3.3.1")
>2+
Parser error: ExpectedFactor(None)
>2(3
Parser error: ExpectedClosingParenthesis

Related Projects

• rscplot