evaluate-expression
A command-line application in Java that allows the user to Evaluate the Value of an Arithmetic Expression.
About
The application implements two approaches to solving a problem. The algorithms I use are described below.
Input Format
The input format of input expression is:
(2+1)*(3+3)
Output Format
The application prints the result in double precision. For example the output of an above expression is:
The result is: 18.0
How does it work?
In the first approach I use two stacks: Double-stack algorithm.
Operand: then push onto the operand stack.
Operator: then push onto the operator stack.
This algorithm has Time Complexity: O(n).
The second approach is with Reverse Polish notation. For more information, please look https://en.wikipedia.org/wiki/Reverse_Polish_notation https://en.wikipedia.org/wiki/Shunting-yard_algorithm https://leachlegacy.ece.gatech.edu/revpol/
This algorithm has Time Complexity: O(n)
Packaging and running the application
The application can be packaged using:
mvn clean install
It produces the algoritm-0.0.1-SNAPSHOT-jar-with-dependencies.jar file in the /target directory
If you want to run the application, you have to set the following input arguments:
Option 1: reversepolis | twostacks [expression]
Where reversepolis | twostacks is the given algorithm, and [expression] is out Arithmetic Expression
Option 2: [expression] Here you can set only the out Arithmetic Expression. The default algorithm is twostacks(TwoStacksAlgorithm)
Usage:
java -jar algoritm-0.0.1-SNAPSHOT-jar-with-dependencies.jar '(2+1)*(3+3)'or
java -jar algoritm-0.0.1-SNAPSHOT-jar-with-dependencies.jar reversepolis '(2+1)*(3+3)'License
This project is licensed under the Apache License 2.0. Check out the license text inside the LICENSE file.
TODO:
Implement full Test coverage(because the current unit tests do not cover all cases) and code optimization.