a read-eval-print-loop, similar to bc(1)
shell
$ git clone https://github.com/nerdypepper/eva.git
$ cargo run
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 ```
+ - * / ^+ -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 ```
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