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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
all trignometric functions expect input in degrees.
conversion to radians is to be done manually (` x * 3.14 / 180`)
```
sin
cos
tan
csc # cosec is for pesants
sec
cot
sinh
cosh
tanh
ln # log to the base e
log # log to the base 10
sqrt # x ^ 0.5
ceil
floor
```
examples:
```
sqrt(sin(30)) # parenstheses are mandatory for functions
log100 # no
log(100) # yes
```
### quality of life features
auto insertion of `*` operator
```
12sin(90) # 12 * sin(90)
ans: 12
(5 + 6)(6 + 7) # (5 + 6) * (6 + 7)
ans: 143
11(12) # 11 * (12)
ans: 132
```
auto balancing of parentheses
```
ceil(sqrt(3^2 + 5^2
ans: 6
```
### todo
- add detailed error handler
- multiple arg functions
- ~~unary operators (minus, factorial)~~
- lineditor with syntax highlighting
- ~~add more functions~~
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