Calculator

This program is simple illustration of implementing math expression evaluator in OO way.

BUILD

To build you need JDK and maven be installed in your system. To build jar run mvn package. Artifact will be putted into ...calculator/target/calculator-1.0-SNAPSHOT-jar-with-dependencies.jar file.

jdk - http://www.oracle.com/technetwork/java/javase/downloads/index.html

maven - http://maven.apache.org/

RUN

To run program JRE needed to be installed. To run GUI type

java -jar calculator-1.0-SNAPSHOT-jar-with-dependencies.jar gui

To run program in console interactive mode run

java -jar calculator-1.0-SNAPSHOT-jar-with-dependencies.jar console

jre - http://www.oracle.com/technetwork/java/javase/downloads/index.html

FEATURES

Calculator supports

arithmetic expressions, like -2 + 4.5 * (2 + 3)
factorial, like 2!
power, like 2 ^ 3 ^ 4
increment and decrement, like (2 + 3)++
basic functions, like sqrt( max( 4, 9, 6))

Only with gui currently (could be easily implemented for console too):

creating aliases defining s = sqrt, and then s(9)
adding more functionality on runtime (in next session)

See tests for details https://github.com/st-kurilin/Calculator/tree/master/src/test/java/com/github/stkurilin/calculator

ADDING FUNCTIONALITY ON RUNTIME

You can add more feature to support by providing additional classes. To do this you need

create your own class
implement Token interface (https://github.com/st-kurilin/Calculator/blob/master/src/main/java/com/github/stkurilin/calculator/core/token/Token.java)
compile your class to get .class file
load it after program started

Be caryful: this is experimenting feature with very naive impl. Also now we have several limitations on classes provided by user

should be placed in on single .class file. (No inner classes are supported)
should be placed in default package You can see details in ExtraTokenTests (https://github.com/st-kurilin/Calculator/blob/master/src/test/java/com/github/stkurilin/calculator/ExtraTokenTests.java)

THINKS TO DO

add missing functionality to console mode
separate console and interactive console mods
be better on adding functionality on runtime

CONTACTS

Please fill free to contact me on any question using skype st.kurilin, email st.kurilin@gmail.com or linkedin id=113714774