Simple toy calcualtor that parses a command-line provided string, and evaluates the resulting expression.

git clone git@github.com:jroelofs/calc.git
mkdir build && cd build
cmake -G Ninja -DCMAKE_BUILD_TYPE=Debug ../calc
ninja

crepl can either be used with and expression as the command-line argument:

$ ./bin/crepl "1 + 1"
2
$ ./bin/crepl "1 + 2 * 3"
7

or with pipes:

$ echo "2*(1+2)" | ./bin/crepl -
6

or as a Read-Evaluate-Print-Loop, or REPL:

$ ./bin/crepl
> 1+2
3
> 3*4
12
> q

$ ninja check