a command-line calculator written in scala
This is a little program i wrote to teach myself scalaz.
Currently using:
- The IO monad
- ValidationNel
- Show
You can compile the program using sbt compile, run it using sbt run for
development you can use sbt ~run and type exit whenever you want to recompile.
calcƶ reads a line from stdin and tries to form an expression tree. If that is successful, it will simplify the expression to a single double value and print it to stdout. If that is not possible calcƶ will print errors to stdout. Then calcƶ will ask for another expression.
Currently calcƶ can handle:
- Spaces (they will be ignored)
- Numeric values (floating point values work)
- +, -, *, / and % operators
- Braces (nesting should work)
The special keyword exit will terminate calcƶ.
A sample session in calcƶ:
sbt run
...
calcƶ> (152 - 148) * (2 + 2)
✓> 16.0
calcƶ> (2e - 1) * (2s * 1d)
✗> Cannot parse '2s'
calcƶ> exit