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# eva
a read-eval-print-loop, similar to `bc(1)`
### installation
```shell
$ git clone https://github.com/nerdypepper/eva.git
$ cargo run
```
### usage
```shell
$ eva
```
type out an expression and hit enter, repeat.
```shell
> 1 + sin(30)
1.5
> floor(sqrt(3^2 + 5^2))
5
> 5sin(45) + cos(0)
4.535533905932738
```
### operators
- binary operators: `+ - * / ^`
- unary operators: `+ -`
### functions
All trignometric functions expect input in degrees.
```
sin
cos
tan
csc
sec
cot
sinh
cosh
tanh
ln
log
sqrt
ceil
floor
deg(x) - convert x to degrees
rad(x) - convert x to radians
abs(x) - (x * x) ^ 0.5
```
examples:
```
sqrt(sin(30)) # parentheses are mandatory for functions
log100 # no
log(100) # yes
```
### quality of life features
- auto insertion of `*` operator
```
12sin(45(2)) # 12 * sin(45 * (2))
ans: 12
```
- auto balancing of parentheses
```
ceil(sqrt(3^2 + 5^2 # ceil(sqrt(3^2 + 5^2))
ans: 6
```
### todo
- ~~add detailed error handler~~
- add support for variables (ans, pi, e)
- multiple arg functions
- ~~unary operators (minus, plus)~~
- screenshots
- ~~lineditor~~ with syntax highlighting
- ~~add more functions~~
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