A simple command-line calculator written in Kotlin
PS this is a practice project of an interpreter, to implement a command-line calculator, I design a series of grammar to do so instead of using reverse Polish notation (RPN)
expr : factor (( PLUS | MINUS) factor) *
term : factor (( MUL | DIV ) factor) *
factor : (PLUS | MINUS) factor | INTEGER | LPAREN expr RPAREN
open your terminal, and type
> $ git clone git@github.com:InnoFang/calc.git
> $ cd calc
> $ gradle build
Then, there is a file named calc-1.0.0.jar in the build/libs
> $ cd build/libs
> $ java -jar calc-1.0.0.jar
you can use like this
calc> 12
12
calc> 34 * 56
1904
calc> 1234 + 87123 - 19283
69074
calc> 22 * 12 - 172 + 56
148
calc> 345 / 5 * ( 234 - 92 ) + 66
9864
calc> 1 ------------ 2
3
calc> 2 ++++-----+++ 3
-1
this project gave me inspiration and idea, as well as help me a lot, thanks
Copyright 2018 InnoFang
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.