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terminal-calculator - READ ME

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• terminal-calculator is a executable command-line calculator that evaluates expressions in a very simple integer expression language.
• Log level controlling via command line arguments possible.
• CI integration setup available.

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REPOSITORY DETAILS

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1. Code will be available at repository : https://github.com/jaksnair/terminal-calculator

2. Branches are, - master : default branch - r<>-dev : dev branch - r<>-dev-travis-ci-test : dev branch with travis-ci integrated.

3. Git hub apps or CIs integrated - Travis-ci : https://travis-ci.org/jaksnair/terminal-calculator

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ASSEMBLY

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1. Please assemble to build the jar using command: mvn clean compile assembly:single

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FUNCTIONALITY NOTE

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1. It evaluates expressions in a very simple integer expression language.
2. Takes an input on the command line, computes the result, and prints it to the console. 
3. Expression details :
   • Numbers : integers between Integer.MIN_VALUE and Integer.MAX_VALUE.
   • Variables: strings of characters, where each character is one of a-z, A-Z.
   • Arithmetic functions: add, sub, mult, div, each taking two arbitrary expressions as arguments. 
     • add - eg: add(1, 2)
     • sub - eg: sub(1, 2)
     • mult - eg: mult(1,2)
     • div - eg: div(2,1)
   • A “let” operator for assigning values to variables: let(, , ) - eg: let(a, 5, add(a, a))
4. Logging verbosity control :
   • levels of verbosity: INFO, ERROR, DEBUG, FATAL, WARN, TRACE, ALL
5. CI setup available.

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USAGE

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1. The jar takes an input on the command line, computes the result, and prints it to the console.  For example: java -jar terminalcalculator.jar "add(2, 2)"

2. Logger level could be controlled via the command line. For example: java -jar -Dlog4j.debug=true terminalcalculator.jar "add(2, 2)"