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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)
ans: 1.5
floor(sqrt(3^2 + 5^2))
ans: 5
5sin(45) + cos(0 # eva will try to autobalance braces
ans: 3.4999999999999996
```
### operators
- binary operators: `+ - * / ^`
- unary operators: `+ -`
### functions
fn(x: Number) -> Number
```
sin(x) |
cos(x) |
tan(x) |
csc(x) | -> x is in degrees
sec(x) |
cot(x) |
sinh(x)
cosh(x)
tanh(x)
ln(x) # log to the base e
log(x) # log to the base 10
sqrt(x) # x ^ 0.5
ceil(x)
floor(x)
```
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
- multiple arg functions
- ~~unary operators (minus, plus)~~
- screenshots
- lineditor with syntax highlighting
- ~~add more functions~~
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