This is a reactive implementation of a RESTful calculator service, that supports addition, subtraction, multiplication, division as well as exponentiation of arbitrary-precision signed decimal numbers. It also supports result caching, so if there is more than one call for the same operation on the same numbers, the result is returned from the cache rather than being recomputed.
To add, subtract, multiply, divide numbers or raise them to some power, issue an HTTP GET call to a corresponding
endpoint (note that for the operations of addition, subtraction, and multiplication, the calculator endpoints support
an input of up to three numbers in the same call):
/add/{a}/{b}/{c}
/subtract/{a}/{b}/{c}
/multiply/{a}/{b}/{c}
/divide/{a}/{b}
/pow/{a}/{b}
The result is a JSON object, containing either a result field with the calculated result or an errors array in case
there are any errors.
The second parameter (the exponent) for the pow endpoint should be a valid integer number from the [0,999999999] range, all
other parameters may be arbitrary-precision signed decimal numbers written either in decimal or exponential notation.
0 to the 0th power equals 1, division of any non-zero number by 0 returns an error and the operation of dividing
0 by 0 is undefined.
If a division renders a non-terminating decimal expansion/no exact representable decimal result, an error is returned.
Download Apache Maven and follow the installation instructions. After that, type
mvn spring-boot:runin a terminal or in a command prompt. The server will bind to localhost:8080 by default.