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# kalk
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[](https://crates.io/crates/kalk_cli)
[](https://github.com/PaddiM8/kalk/blob/master/LICENSE)
[](https://docs.rs/kalk/latest/kalk/)
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Kalk is a calculator (both program and library) that supports user-defined variables, functions, and units (experimental).
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[Project kanban board (Kolan) ](https://kolan.smrk.me/Board/4RAdMjLDz )
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## Features
* Operators: +, -, \*, /, !
* Groups: (), ⌈⌉, ⌋⌊
* [Pre-defined functions and constants ](https://github.com/PaddiM8/kalk/blob/master/kalk/src/prelude.rs )
* User-defined functions and variables. `f(x, y) = xy` , `x = 5`
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* User-defined units (experimental). `unit m = cm/100` , `2m/50cm` , `50cm to m`
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* Understands fairly ambiguous syntax. Eg. `2sin50 + 2xy`
* Syntax highlighting
* Special-symbol completion on tab. Eg. write `sqrt` and press tab. It will be turned into `√` .
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* Sum function: `sum(start, to, expression)` Eg. `sum(1, 3, 2n+1)` is the same as `2*1+1 + 2*2+1 + 2*3+1` = `15`
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* Load a file including predefined functions and constants. For example, if you're going to use Kalk for physics, you load up your file with physics functions/constants when starting Kalk. `-i file`
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* Misc: separate expressions by a semicolon to write them on the same line, use the `ans` variable to get the value of the previously calculated expression.
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## Installing
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Make sure you have `diffutils` `gcc` `make` and `m4` installed. **If you use windows:** [follow the instructions here ](https://docs.rs/gmp-mpfr-sys/1.2.3/gmp_mpfr_sys/index.html#building-on-windows )
If anyone knows how to get `gmp_mpfr_sys` on Windows on Travis, let me know.
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### Cargo install
Run `cargo install kalk_cli`
### Compiling yourself
1. Go into the `kalk_cli` directory.
2. Run `cargo build --release`
3. Grab the binary from `targets/release`
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## Syntax
### Functions
__Defining:__ name(parameter1, parameter2, ...) = expression
**Example:** `f(x) = 2x+3`
__Using:__ name(argument1, argument2)
**Example:** `f(2)`
### Variables
__Defining:__ name = expression
**Example:** `x = 3`
__Using:__ name
**Example:** `x`
### Units
*Note: You only need to define the relationship between two units once. You will be able to convert between both of them.*
__Defining:__ `unit` name = expression
**Example:** `unit deg = (rad*180)/π`
__Using:__ Use them freely in expressions.
**Example:** `2m/50cm`
__Converting:__ expression `to` unit
**Example:** `2 m to cm`
