/ExpressionCalculator

Primary LanguageJava

ExpressionCalculator

Takes an expression from the input, and produce the result of calculations considering the precedence of operators (and parentheses, of course):

  1. Factor (*)
  2. Term (+ -)
  3. Relation (< > =)

Dependencies

To be able to build and run the application you are supposed to have the following software installed:

  • Oracle JDK 8 ver. 181
  • Maven ver. 3.5.4

and the appropriate environment variables set.

How to run

To run the program you can use the following scripts:

  • run.bat for Windows OS
  • run.sh for Unix based OS

Or you can type the following commands by yourself in the project root directory:

mvn package
cd target
java -jar ExpressionCalculator-1.0-SNAPSHOT.jar

After that the calculations results will be written to ./data/out.txt line by line based on the provided input expressions in ./data/in.txt.

In order to run only the implemented JUnit tests you can simply use:

mvn test

Accuracy

Inaccuracy of calculations is expected in case of operations on integers which are beyond java.lang.Long boundaries ( a minimum value of -2^63 and a maximum value of 2^63-1), since the ExpressionCalculator is intended to be used only with integers for the time being.